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package ds;

import java.util.HashSet;

import java.util.Set;

/**

* A = A∪B

*

* @author yangyi 2018年05月04日18:15:39

*/

public class Union {

@Override

protected Object clone() throws CloneNotSupportedException {

return super.clone();

}

public static void main(String[] args) {

Set<String> a = new HashSet<>();

a.add("张三");

a.add("李四");

a.add("王五");

Set<String> b = new HashSet<>();

b.add("赵六");

b.add("张三");

b.add("李四");

System.out.println("before");

System.out.println("a:" + a.toString());

for (String s : b) {

if (!a.contains(s)) {

a.add(s);

}

}

System.out.println("after");

System.out.println("a:" + a.toString());

}

}