質問編集履歴
2
不正削除対応
test
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@@ -1 +1 @@
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JAVA
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JAVAでCSVファイルの編集
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test
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@@ -1 +1,291 @@
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### 2回目の処理で情報が表示されない
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javaで
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1
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CSVファイルに保存されている社員情報を表示・検索・登録・削除する
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システムを作っています。
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削除以外の機能が作り終わり、結合して実行をかけてみたところ、
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社員情報を表示してトップメニューに戻ってからもう一度社員情報を表示しようとすると
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社員情報が表示されないという問題が発生しました。
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### 該当のソースコード
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```java
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import java.io.*;
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import java.util.*;
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public class Employee{
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public static void main(String[] args){
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try{
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File csv = new File("syain.csv");
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InputStreamReader isr = new InputStreamReader(System.in);
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BufferedReader brr = new BufferedReader(isr);
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BufferedReader br = new BufferedReader(new FileReader(csv));
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BufferedWriter bw = new BufferedWriter(new FileWriter(csv, true));
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int flag = 0;
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int nu = 0;
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while(flag == 0){
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System.out.println("＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃");
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System.out.println("メインメニュー");
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System.out.println("＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃");
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50
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System.out.println("");
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52
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System.out.println("１ 社員表示");
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System.out.println("２ 社員検索");
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System.out.println("３ 社員登録");
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System.out.println("４ 社員削除");
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60
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System.out.println("９９ 終了");
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System.out.println("");
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System.out.println("メニュー番号を入力してください");
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System.out.print("-->");
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68
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69
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String name = brr.readLine();
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nu = Integer.parseInt(name);
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switch(nu){
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case 1:
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int bango[] = new int[1];
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79
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String mei[] = new String[1];
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80
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81
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System.out.println();
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83
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System.out.println("----------");
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84
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85
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System.out.println("社員表示");
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86
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87
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System.out.println("----------");
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89
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System.out.println();
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90
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91
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System.out.println("社員情報を表示します");
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92
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93
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System.out.println();
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94
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95
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System.out.println("社員番号 社員名");
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96
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97
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System.out.println("----- ------");
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99
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String line = "";
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101
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while((line = br.readLine()) != null)
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102
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103
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{
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105
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StringTokenizer st = new StringTokenizer(line,",");
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107
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while(st.hasMoreTokens())
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108
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{
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111
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System.out.print(st.nextToken() + " ");
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System.out.print("");
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114
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115
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}
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System.out.println();
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}
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120
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121
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//br.close();
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122
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123
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break;
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124
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125
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case 2:
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126
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127
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int bango2[] = new int[1];
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128
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129
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System.out.println();
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130
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131
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System.out.println("----------");
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133
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System.out.println("社員検索");
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134
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135
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System.out.println("----------");
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136
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137
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System.out.println();
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138
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139
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System.out.println("社員情報を検索して表示します");
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140
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141
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System.out.println();
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142
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143
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int a = 0;
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144
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145
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System.out.println("検索する社員番号を入力してください");
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146
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147
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System.out.print("-->");
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148
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149
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bango2[a] = Integer.parseInt(brr.readLine());
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150
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151
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System.out.println();
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152
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153
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System.out.println("社員番号 社員名");
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154
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155
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System.out.println("----- ------");
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156
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157
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String line2 = "";
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158
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159
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while((line2 = br.readLine()) != null)
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160
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161
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{
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162
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163
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StringTokenizer st = new StringTokenizer(line2,",");
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164
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165
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String bango3 = st.nextToken();
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166
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167
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int bango4 = Integer.parseInt(bango3);
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168
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169
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if(bango2[a] == bango4)
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170
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171
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{
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172
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173
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System.out.print(bango3 + " " + st.nextToken());
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174
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175
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System.out.print("");
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176
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177
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}
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178
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179
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System.out.println();
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180
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181
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}
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182
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183
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//br.close();
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184
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+
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185
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break;
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186
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187
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case 3:
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188
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189
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int bango5[] = new int[1];
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190
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191
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String mei2[] = new String[1];
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192
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193
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System.out.println();
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194
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195
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System.out.println("----------");
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196
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197
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System.out.println("社員登録");
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198
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199
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System.out.println("----------");
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200
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201
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System.out.println();
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202
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203
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System.out.println("社員情報を登録します");
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204
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205
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System.out.println();
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206
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207
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int c = 0;
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208
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209
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System.out.println("登録する社員番号を入力してください");
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210
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211
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System.out.print("-->");
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212
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213
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bango5[c] = Integer.parseInt(brr.readLine());
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214
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215
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System.out.println("登録する社員名を入力してください");
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216
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217
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System.out.print("-->");
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218
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+
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219
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mei2[c] = brr.readLine();
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220
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+
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221
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bw.write(bango5[c] + "," + mei2[c] + "\r\n");
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222
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+
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223
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+
//bw.close();
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224
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+
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225
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System.out.println("社員番号「" + bango5[c] + "」社員名「" + mei2[c] + "」の社員情報を登録しました");
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226
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+
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227
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System.out.println();
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228
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+
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229
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System.out.println("社員番号 社員名");
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230
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231
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+
System.out.println("----- ------");
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232
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+
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233
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+
String line3 = "";
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234
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+
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235
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while((line3 = br.readLine()) != null)
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236
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237
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+
{
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238
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+
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239
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StringTokenizer st = new StringTokenizer(line3,",");
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240
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+
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241
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+
while(st.hasMoreTokens())
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242
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+
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243
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+
{
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244
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+
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245
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System.out.print(st.nextToken() + " ");
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246
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+
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247
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+
System.out.print("");
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248
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+
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249
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+
}
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250
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+
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251
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System.out.println();
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252
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+
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253
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}
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254
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255
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//br.close();
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256
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+
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257
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+
break;
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258
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259
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+
case 4:
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260
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+
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261
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+
//削除機能(未完成)
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262
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+
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263
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+
break;
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264
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+
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265
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+
case 99:
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266
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+
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267
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+
flag = 1;
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268
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+
|
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269
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+
break;
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270
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+
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271
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+
}
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272
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+
|
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273
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+
continue;
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274
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+
|
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275
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+
}
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276
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+
|
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277
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+
}catch(Exception e){
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278
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+
|
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279
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+
System.out.println(e);
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280
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+
|
|
281
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+
}
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282
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+
|
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283
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+
}
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284
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+
|
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285
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+
}
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286
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+
|
|
287
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+
```
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288
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+
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289
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+
どのようにしたら、2回目以降の処理でも
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290
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+
|
|
291
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+
名簿情報の表示や検索、登録、削除が行えますでしょうか?
|
1
JAVA
test
CHANGED
|
@@ -1 +1 @@
|
|
|
1
|
-
JAVA
|
|
1
|
+
JAVAJAVAJAVA
|
test
CHANGED
|
@@ -1,331 +1 @@
|
|
|
1
|
-
### 2回目の処理で情報が表示されない
|
|
2
|
-
|
|
3
|
-
javaで
|
|
4
|
-
|
|
5
|
-
|
|
1
|
+
JAVAJAVAJAVAJAVAJAVAJAVAJAVAJAVA
|
|
6
|
-
|
|
7
|
-
システムを作っています。
|
|
8
|
-
|
|
9
|
-
削除以外の機能が作り終わり、結合して実行をかけてみたところ、
|
|
10
|
-
|
|
11
|
-
社員情報を表示してトップメニューに戻ってからもう一度社員情報を表示しようとすると
|
|
12
|
-
|
|
13
|
-
社員情報が表示されないという問題が発生しました。
|
|
14
|
-
|
|
15
|
-
|
|
16
|
-
|
|
17
|
-
### 該当のソースコード
|
|
18
|
-
|
|
19
|
-
|
|
20
|
-
|
|
21
|
-
```java
|
|
22
|
-
|
|
23
|
-
import java.io.*;
|
|
24
|
-
|
|
25
|
-
import java.util.*;
|
|
26
|
-
|
|
27
|
-
|
|
28
|
-
|
|
29
|
-
public class Employee{
|
|
30
|
-
|
|
31
|
-
public static void main(String[] args){
|
|
32
|
-
|
|
33
|
-
try{
|
|
34
|
-
|
|
35
|
-
File csv = new File("syain.csv");
|
|
36
|
-
|
|
37
|
-
InputStreamReader isr = new InputStreamReader(System.in);
|
|
38
|
-
|
|
39
|
-
BufferedReader brr = new BufferedReader(isr);
|
|
40
|
-
|
|
41
|
-
BufferedReader br = new BufferedReader(new FileReader(csv));
|
|
42
|
-
|
|
43
|
-
BufferedWriter bw = new BufferedWriter(new FileWriter(csv, true));
|
|
44
|
-
|
|
45
|
-
int flag = 0;
|
|
46
|
-
|
|
47
|
-
int nu = 0;
|
|
48
|
-
|
|
49
|
-
|
|
50
|
-
|
|
51
|
-
while(flag == 0){
|
|
52
|
-
|
|
53
|
-
|
|
54
|
-
|
|
55
|
-
System.out.println("＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃");
|
|
56
|
-
|
|
57
|
-
System.out.println("メインメニュー");
|
|
58
|
-
|
|
59
|
-
System.out.println("＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃");
|
|
60
|
-
|
|
61
|
-
System.out.println("");
|
|
62
|
-
|
|
63
|
-
System.out.println("１ 社員表示");
|
|
64
|
-
|
|
65
|
-
System.out.println("２ 社員検索");
|
|
66
|
-
|
|
67
|
-
System.out.println("３ 社員登録");
|
|
68
|
-
|
|
69
|
-
System.out.println("４ 社員削除");
|
|
70
|
-
|
|
71
|
-
System.out.println("９９ 終了");
|
|
72
|
-
|
|
73
|
-
System.out.println("");
|
|
74
|
-
|
|
75
|
-
System.out.println("メニュー番号を入力してください");
|
|
76
|
-
|
|
77
|
-
System.out.print("-->");
|
|
78
|
-
|
|
79
|
-
String name = brr.readLine();
|
|
80
|
-
|
|
81
|
-
nu = Integer.parseInt(name);
|
|
82
|
-
|
|
83
|
-
|
|
84
|
-
|
|
85
|
-
switch(nu){
|
|
86
|
-
|
|
87
|
-
case 1:
|
|
88
|
-
|
|
89
|
-
int bango[] = new int[1];
|
|
90
|
-
|
|
91
|
-
String mei[] = new String[1];
|
|
92
|
-
|
|
93
|
-
|
|
94
|
-
|
|
95
|
-
System.out.println();
|
|
96
|
-
|
|
97
|
-
System.out.println("----------");
|
|
98
|
-
|
|
99
|
-
System.out.println("社員表示");
|
|
100
|
-
|
|
101
|
-
System.out.println("----------");
|
|
102
|
-
|
|
103
|
-
System.out.println();
|
|
104
|
-
|
|
105
|
-
System.out.println("社員情報を表示します");
|
|
106
|
-
|
|
107
|
-
System.out.println();
|
|
108
|
-
|
|
109
|
-
System.out.println("社員番号 社員名");
|
|
110
|
-
|
|
111
|
-
System.out.println("----- ------");
|
|
112
|
-
|
|
113
|
-
String line = "";
|
|
114
|
-
|
|
115
|
-
while((line = br.readLine()) != null)
|
|
116
|
-
|
|
117
|
-
{
|
|
118
|
-
|
|
119
|
-
StringTokenizer st = new StringTokenizer(line,",");
|
|
120
|
-
|
|
121
|
-
while(st.hasMoreTokens())
|
|
122
|
-
|
|
123
|
-
{
|
|
124
|
-
|
|
125
|
-
System.out.print(st.nextToken() + " ");
|
|
126
|
-
|
|
127
|
-
System.out.print("");
|
|
128
|
-
|
|
129
|
-
}
|
|
130
|
-
|
|
131
|
-
System.out.println();
|
|
132
|
-
|
|
133
|
-
}
|
|
134
|
-
|
|
135
|
-
//br.close();
|
|
136
|
-
|
|
137
|
-
break;
|
|
138
|
-
|
|
139
|
-
|
|
140
|
-
|
|
141
|
-
case 2:
|
|
142
|
-
|
|
143
|
-
int bango2[] = new int[1];
|
|
144
|
-
|
|
145
|
-
|
|
146
|
-
|
|
147
|
-
System.out.println();
|
|
148
|
-
|
|
149
|
-
System.out.println("----------");
|
|
150
|
-
|
|
151
|
-
System.out.println("社員検索");
|
|
152
|
-
|
|
153
|
-
System.out.println("----------");
|
|
154
|
-
|
|
155
|
-
System.out.println();
|
|
156
|
-
|
|
157
|
-
System.out.println("社員情報を検索して表示します");
|
|
158
|
-
|
|
159
|
-
System.out.println();
|
|
160
|
-
|
|
161
|
-
|
|
162
|
-
|
|
163
|
-
int a = 0;
|
|
164
|
-
|
|
165
|
-
|
|
166
|
-
|
|
167
|
-
System.out.println("検索する社員番号を入力してください");
|
|
168
|
-
|
|
169
|
-
System.out.print("-->");
|
|
170
|
-
|
|
171
|
-
bango2[a] = Integer.parseInt(brr.readLine());
|
|
172
|
-
|
|
173
|
-
|
|
174
|
-
|
|
175
|
-
System.out.println();
|
|
176
|
-
|
|
177
|
-
System.out.println("社員番号 社員名");
|
|
178
|
-
|
|
179
|
-
System.out.println("----- ------");
|
|
180
|
-
|
|
181
|
-
String line2 = "";
|
|
182
|
-
|
|
183
|
-
while((line2 = br.readLine()) != null)
|
|
184
|
-
|
|
185
|
-
{
|
|
186
|
-
|
|
187
|
-
StringTokenizer st = new StringTokenizer(line2,",");
|
|
188
|
-
|
|
189
|
-
String bango3 = st.nextToken();
|
|
190
|
-
|
|
191
|
-
int bango4 = Integer.parseInt(bango3);
|
|
192
|
-
|
|
193
|
-
if(bango2[a] == bango4)
|
|
194
|
-
|
|
195
|
-
{
|
|
196
|
-
|
|
197
|
-
System.out.print(bango3 + " " + st.nextToken());
|
|
198
|
-
|
|
199
|
-
System.out.print("");
|
|
200
|
-
|
|
201
|
-
}
|
|
202
|
-
|
|
203
|
-
System.out.println();
|
|
204
|
-
|
|
205
|
-
}
|
|
206
|
-
|
|
207
|
-
//br.close();
|
|
208
|
-
|
|
209
|
-
break;
|
|
210
|
-
|
|
211
|
-
|
|
212
|
-
|
|
213
|
-
case 3:
|
|
214
|
-
|
|
215
|
-
int bango5[] = new int[1];
|
|
216
|
-
|
|
217
|
-
String mei2[] = new String[1];
|
|
218
|
-
|
|
219
|
-
|
|
220
|
-
|
|
221
|
-
System.out.println();
|
|
222
|
-
|
|
223
|
-
System.out.println("----------");
|
|
224
|
-
|
|
225
|
-
System.out.println("社員登録");
|
|
226
|
-
|
|
227
|
-
System.out.println("----------");
|
|
228
|
-
|
|
229
|
-
System.out.println();
|
|
230
|
-
|
|
231
|
-
System.out.println("社員情報を登録します");
|
|
232
|
-
|
|
233
|
-
System.out.println();
|
|
234
|
-
|
|
235
|
-
|
|
236
|
-
|
|
237
|
-
int c = 0;
|
|
238
|
-
|
|
239
|
-
|
|
240
|
-
|
|
241
|
-
System.out.println("登録する社員番号を入力してください");
|
|
242
|
-
|
|
243
|
-
System.out.print("-->");
|
|
244
|
-
|
|
245
|
-
bango5[c] = Integer.parseInt(brr.readLine());
|
|
246
|
-
|
|
247
|
-
System.out.println("登録する社員名を入力してください");
|
|
248
|
-
|
|
249
|
-
System.out.print("-->");
|
|
250
|
-
|
|
251
|
-
mei2[c] = brr.readLine();
|
|
252
|
-
|
|
253
|
-
bw.write(bango5[c] + "," + mei2[c] + "\r\n");
|
|
254
|
-
|
|
255
|
-
//bw.close();
|
|
256
|
-
|
|
257
|
-
|
|
258
|
-
|
|
259
|
-
System.out.println("社員番号「" + bango5[c] + "」社員名「" + mei2[c] + "」の社員情報を登録しました");
|
|
260
|
-
|
|
261
|
-
System.out.println();
|
|
262
|
-
|
|
263
|
-
System.out.println("社員番号 社員名");
|
|
264
|
-
|
|
265
|
-
System.out.println("----- ------");
|
|
266
|
-
|
|
267
|
-
String line3 = "";
|
|
268
|
-
|
|
269
|
-
while((line3 = br.readLine()) != null)
|
|
270
|
-
|
|
271
|
-
{
|
|
272
|
-
|
|
273
|
-
StringTokenizer st = new StringTokenizer(line3,",");
|
|
274
|
-
|
|
275
|
-
while(st.hasMoreTokens())
|
|
276
|
-
|
|
277
|
-
{
|
|
278
|
-
|
|
279
|
-
System.out.print(st.nextToken() + " ");
|
|
280
|
-
|
|
281
|
-
System.out.print("");
|
|
282
|
-
|
|
283
|
-
}
|
|
284
|
-
|
|
285
|
-
System.out.println();
|
|
286
|
-
|
|
287
|
-
}
|
|
288
|
-
|
|
289
|
-
//br.close();
|
|
290
|
-
|
|
291
|
-
break;
|
|
292
|
-
|
|
293
|
-
|
|
294
|
-
|
|
295
|
-
case 4:
|
|
296
|
-
|
|
297
|
-
//削除機能(未完成)
|
|
298
|
-
|
|
299
|
-
break;
|
|
300
|
-
|
|
301
|
-
|
|
302
|
-
|
|
303
|
-
case 99:
|
|
304
|
-
|
|
305
|
-
flag = 1;
|
|
306
|
-
|
|
307
|
-
break;
|
|
308
|
-
|
|
309
|
-
}
|
|
310
|
-
|
|
311
|
-
continue;
|
|
312
|
-
|
|
313
|
-
}
|
|
314
|
-
|
|
315
|
-
}catch(Exception e){
|
|
316
|
-
|
|
317
|
-
System.out.println(e);
|
|
318
|
-
|
|
319
|
-
}
|
|
320
|
-
|
|
321
|
-
}
|
|
322
|
-
|
|
323
|
-
}
|
|
324
|
-
|
|
325
|
-
```
|
|
326
|
-
|
|
327
|
-
|
|
328
|
-
|
|
329
|
-
どのようにしたら、2回目以降の処理でも
|
|
330
|
-
|
|
331
|
-
名簿情報の表示や検索、登録、削除が行えますでしょうか?
|