版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/sdz20172133/article/details/84453390
package Work1;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class Work1 {
public static void main(String[] args)
{
List <Integer> list=new ArrayList<Integer>();
list.add(1);
list.add(2);
list.add(3);
list.add(4);
List<Integer> list2=new ArrayList<Integer>();
list2.add(1);
list2.add(3);
list2.add(5);
list2.add(7);
list2.add(9);
list2.add(11);
boolean isContains=list.retainAll(list2);
//System.out.println(isContains);
System.out.println("两个集合的交集：");
for(Integer c:list)
{
System.out.print(c+" ");
}
System.out.println();
boolean notContains1=list2.removeAll(list);
//System.out.println(notContains1);
System.out.println("差集");
for(Integer c:list2)
{
System.out.print(c+" ");
}
System.out.println();
/*boolean notContains2=list.removeAll(list2);
System.out.println(notContains2);
System.out.println("差集");
for(Integer c:list)
{
System.out.println(c);
}*///错误
//求并集
Set<Integer>set1=new HashSet<Integer>();
set1.addAll(list);
set1.addAll(list2);
System.out.println("两个集合的并集");
for(Integer it:set1)
{
System.out.print(it+" ");
}
System.out.println();
}
}