判断List中是否包含相同元素
import java
.util
.ArrayList
;
import java
.util
.HashSet
;
import java
.util
.List
;
public class ListHaveRepeat {
public static void main(String
[] args
) {
List
<String
> list
= new ArrayList<String
>();
list
.add("1");
list
.add("2");
list
.add("2");
boolean isRepeat
= list
.size() != new HashSet<String
>(list
).size();
System
.out
.println("list中包含重复元素:" + isRepeat
);
}
}
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