回答編集履歴
3
補足
test
CHANGED
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@@ -1,3 +1,7 @@
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1
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厨二的に。
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2
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3
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4
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1
5
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とりあえず前半だけ
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2
6
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3
7
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2
SimpleEntryで作ってみた
test
CHANGED
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@@ -116,4 +116,70 @@
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116
116
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117
117
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やっぱりきれいじゃない。クラス作らなきゃいけないもんかなあ。
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118
118
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119
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+
SimpleEntry 使ってみる:
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120
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121
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122
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123
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```java
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124
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125
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package teratail;
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126
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127
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128
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129
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import java.util.AbstractMap.SimpleEntry;
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130
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131
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import java.util.Arrays;
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132
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133
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import java.util.Comparator;
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134
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135
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136
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137
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public class Teratail40137 {
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138
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139
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140
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141
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static SimpleEntry<SimpleEntry, Double> reportAndRatio(SimpleEntry e) {
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142
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143
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int[] v = (int[]) e.getValue();
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144
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145
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double r = (double) v[1] / (double) v[0];
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146
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+
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147
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System.out.printf("%sは、今季 6 月 15 日現在 %s打数 %s安打で，打率 %fです.\n", e.getKey(), v[0], v[1], r);
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148
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+
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149
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return new SimpleEntry(e, r);
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150
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+
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151
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}
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152
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153
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154
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155
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public static void main(String[] args) {
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156
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157
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SimpleEntry[] players = {
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158
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159
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new SimpleEntry("鳥谷", new int[]{239, 80}),
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160
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161
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new SimpleEntry("大島", new int[]{267, 90}),
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162
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+
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163
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new SimpleEntry("糸井", new int[]{231, 82}),
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164
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165
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new SimpleEntry("柳田", new int[]{217, 73}) };
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166
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167
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+
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168
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+
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169
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Arrays.stream(players)
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170
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+
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171
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+
.map(Teratail40137::reportAndRatio)
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172
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+
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173
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.max(Comparator.comparing(x -> x.getValue()))
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174
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+
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175
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.ifPresent(x -> {System.out.println("打率が最も高いのは: " + x.getKey().getKey());});
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176
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+
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177
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+
}
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178
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+
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179
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+
}
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180
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+
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181
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+
```
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182
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+
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183
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+
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184
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+
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119
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-
いろいろ勉強になった。
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185
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+
こんなもんかな。いろいろ勉強になった。
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1
後半も作った
test
CHANGED
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@@ -31,3 +31,89 @@
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31
31
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32
32
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33
33
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んー。なんかきれいじゃないな
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34
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35
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36
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37
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+
後半も作ってみた:
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38
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39
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40
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41
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+
```java
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42
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+
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43
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package teratail;
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44
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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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import java.util.Arrays;
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48
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+
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49
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import java.util.Comparator;
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50
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+
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51
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import java.util.Formatter;
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52
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+
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53
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import java.util.stream.Collectors;
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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 class Teratail40137 {
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58
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+
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59
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public static void main(String[] args) {
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60
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+
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61
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Player[] players = { new Player("鳥谷", 239, 80), new Player("大島", 267, 90), new Player("糸井", 231, 82), new Player("柳田", 217, 73) };
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62
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+
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63
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System.out.println(Arrays.stream(players).map(Player::toString).collect(Collectors.joining()));
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64
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+
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65
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+
Arrays.stream(players).max(Comparator.comparing(x -> x.ratio())).ifPresent(x -> {System.out.println("打率が最も高いのは: " + x.name);});
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66
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+
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67
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+
}
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68
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+
|
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69
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+
}
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70
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+
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71
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+
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72
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+
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73
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+
class Player {
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|
74
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+
|
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75
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final String name;
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76
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+
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77
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+
final int sheet;
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78
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+
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79
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+
final int hit;
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|
80
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+
|
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81
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+
|
|
82
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+
|
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83
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+
public Player(String name, int sheet, int hit) {
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84
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+
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85
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this.name = name;
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86
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+
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87
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this.sheet = sheet;
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88
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+
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89
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this.hit = hit;
|
|
90
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+
|
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91
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+
}
|
|
92
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+
|
|
93
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+
|
|
94
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+
|
|
95
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+
double ratio() {
|
|
96
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+
|
|
97
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+
return (double) hit / (double) sheet;
|
|
98
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+
|
|
99
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+
}
|
|
100
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+
|
|
101
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+
|
|
102
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+
|
|
103
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+
public String toString() {
|
|
104
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+
|
|
105
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+
try (Formatter f = new Formatter()) {
|
|
106
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+
|
|
107
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+
return f.format("%sは、今季 6 月 15 日現在 %s 打数 %s安打で，打率 %fです.\n", name, sheet, hit, ratio()).toString();
|
|
108
|
+
|
|
109
|
+
}
|
|
110
|
+
|
|
111
|
+
}
|
|
112
|
+
|
|
113
|
+
}
|
|
114
|
+
|
|
115
|
+
```
|
|
116
|
+
|
|
117
|
+
やっぱりきれいじゃない。クラス作らなきゃいけないもんかなあ。
|
|
118
|
+
|
|
119
|
+
いろいろ勉強になった。
|