java中如何获取list里面相同的元素？

Question

如题所述

Answer 1

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class Test {
public static void main(String args[]) {
List<String> list = new ArrayList<String>() {
private static final long serialVersionUID = -6469181946992000438L;
{
this.add("aaa");
this.add("bbb");
this.add("ccc");
this.add("aaa");
this.add("bbb");
this.add("ddd");
this.add("eee");
}
};
Set<String> set = new HashSet<String>();
for (String ls : list) {
if (set.contains(ls)) {
System.out.println("重复值：" + ls);
}
set.add(ls);
}
}
}

Answer 2

一般情况只有用for循环或者foreache然后放到map里面！

Answer 3

过滤掉重复的还是