import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
class Data
{
public int x=6;
public int y=7;
public Data(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Data data = (Data) o;
return x == data.x &&
y == data.y;
}
@Override
public int hashCode() {
return Objects.hash(x, y);
}
}
public class TestSet {
public static void main(String[] args) {
Set<Data> set=new HashSet<>();
Data data1=new Data(3,4);
Data data2=new Data(3,5);
set.add(data1);
set.add(data2);
System.out.println(set.size());
data2.y=4;
System.out.println(set.size());
}
}
集合中的数据修改之后并不能影响集合中的hashcode的变化
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转载自blog.csdn.net/zhoumingsong123/article/details/83904435
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