回答編集履歴
1
意味的に同じ例を追加
test
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@@ -161,3 +161,71 @@
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参考
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edx: Software Construction in Java
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###追記（意味的に同じにしたければ）
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---
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numとnameがともに等しければ、おなじSampleオブジェクトだと判定する、という回答が抜けていました。
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```Java
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package test;
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public class ImmutableSample {
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private final int num;
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private final String name;
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public ImmutableSample(int num, String name) {
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this.num = num;
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this.name = name;
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}
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@Override
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public boolean equals(Object obj){
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if(!(obj instanceof ImmutableSample)){
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return false;
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}
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ImmutableSample s = (ImmutableSample) obj;
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return (s.num == this.num && s.name.equals(this.name));
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}
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@Override
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public int hashCode(){
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return (this.num + this.name.hashCode());
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}
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}
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```
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