質問編集履歴
4
追加
test
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File without changes
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test
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@@ -185,3 +185,13 @@
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185
185
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■円周で何も入力しなかった場合
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186
186
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187
187
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3,14が適用されるコードって......
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188
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190
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191
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192
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193
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メインで円周率を入力し無かった場合
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194
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195
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円周率に3.14が代入されるようにするには
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196
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197
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どうすればよいですか？
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3
追加
test
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File without changes
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test
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@@ -173,3 +173,15 @@
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173
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-----
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174
174
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175
175
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でもOKにしたいのですが....
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176
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177
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178
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182
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183
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184
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185
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■円周で何も入力しなかった場合
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186
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+
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187
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3,14が適用されるコードって......
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2
追加
test
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File without changes
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test
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@@ -163,3 +163,13 @@
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163
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わからない...
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166
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+
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167
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あと円周率入力の際小数を入力した場合で例外処理が行われてしまいます.......
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168
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169
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-----
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170
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171
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円周率>5.0
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172
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173
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-----
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174
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+
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175
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でもOKにしたいのですが....
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1
コード追加
test
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File without changes
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test
CHANGED
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@@ -15,3 +15,151 @@
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15
15
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16
16
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17
17
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コンストラクタを設定するメリットは？
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18
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+
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19
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+
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20
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21
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+
package en12;
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22
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23
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24
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25
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+
public class Circle {
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26
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27
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+
private double pi, radius;
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28
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29
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final double PI = 3.14;
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30
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+
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31
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32
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33
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public Circle(double radius) {
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34
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35
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this.pi=3.14;
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36
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37
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}
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38
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+
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39
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+
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40
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+
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41
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+
public double getPi() {
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42
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+
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43
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return pi;
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44
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+
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45
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+
}
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46
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+
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47
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+
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48
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+
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49
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+
public void setPi(double pi) {
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50
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+
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51
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+
this.pi = pi;
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52
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+
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53
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+
}
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54
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+
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55
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+
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56
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+
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57
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+
public double getRadius() {
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58
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+
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59
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+
return radius;
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60
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+
|
|
61
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+
}
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62
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+
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63
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+
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64
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+
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|
65
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+
public void setRadius(double radius) {
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66
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+
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67
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+
this.radius = radius;
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68
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+
|
|
69
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+
}
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|
70
|
+
|
|
71
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+
|
|
72
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+
|
|
73
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+
public Circle(double radius, double pi) {
|
|
74
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+
|
|
75
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+
super();
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76
|
+
|
|
77
|
+
this.radius = radius;
|
|
78
|
+
|
|
79
|
+
this.pi = pi;
|
|
80
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+
|
|
81
|
+
}
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|
82
|
+
|
|
83
|
+
|
|
84
|
+
|
|
85
|
+
void area() {
|
|
86
|
+
|
|
87
|
+
double s = radius * radius * pi;
|
|
88
|
+
|
|
89
|
+
double l = radius * 2 * pi;
|
|
90
|
+
|
|
91
|
+
System.out.print(s);
|
|
92
|
+
|
|
93
|
+
System.out.println(l);
|
|
94
|
+
|
|
95
|
+
}
|
|
96
|
+
|
|
97
|
+
}
|
|
98
|
+
|
|
99
|
+
|
|
100
|
+
|
|
101
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+
package en12;
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|
102
|
+
|
|
103
|
+
|
|
104
|
+
|
|
105
|
+
import java.io.BufferedReader;
|
|
106
|
+
|
|
107
|
+
import java.io.IOException;
|
|
108
|
+
|
|
109
|
+
import java.io.InputStreamReader;
|
|
110
|
+
|
|
111
|
+
|
|
112
|
+
|
|
113
|
+
public class Ex0512 {
|
|
114
|
+
|
|
115
|
+
|
|
116
|
+
|
|
117
|
+
|
|
118
|
+
|
|
119
|
+
public static void main(String[] args) throws IOException {
|
|
120
|
+
|
|
121
|
+
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
|
|
122
|
+
|
|
123
|
+
try {
|
|
124
|
+
|
|
125
|
+
System.out.print("半径>");
|
|
126
|
+
|
|
127
|
+
String str = br.readLine();
|
|
128
|
+
|
|
129
|
+
double r = Integer.parseInt(str);
|
|
130
|
+
|
|
131
|
+
try {
|
|
132
|
+
|
|
133
|
+
System.out.print("円周率>");
|
|
134
|
+
|
|
135
|
+
String str1 = br.readLine();
|
|
136
|
+
|
|
137
|
+
double p = Integer.parseInt(str1);
|
|
138
|
+
|
|
139
|
+
Circle B = new Circle(r, p);
|
|
140
|
+
|
|
141
|
+
Circle C = new Circle(r);
|
|
142
|
+
|
|
143
|
+
System.out.println("面積："+(r*r*p));
|
|
144
|
+
|
|
145
|
+
} catch (NumberFormatException e) {
|
|
146
|
+
|
|
147
|
+
System.out.println("円周は数値を入力してください");
|
|
148
|
+
|
|
149
|
+
}
|
|
150
|
+
|
|
151
|
+
} catch (NumberFormatException e) {
|
|
152
|
+
|
|
153
|
+
System.out.println("半径は数値を入力してください");
|
|
154
|
+
|
|
155
|
+
}
|
|
156
|
+
|
|
157
|
+
}
|
|
158
|
+
|
|
159
|
+
}
|
|
160
|
+
|
|
161
|
+
|
|
162
|
+
|
|
163
|
+
|
|
164
|
+
|
|
165
|
+
わからない...
|