java 集合的基础2

package com.java13.myjava;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.junit.Test;

/**
*
* set 集合无序 不重复
*
*/
public class Testset {
@Test
public void teste1() {
Set<String> set = new HashSet<String>();
set.add("ad");
set.add("ada");
set.add("adas");

// System.out.println(set.size());
//set.iterator(); 迭代器
Iterator<String> it = set.iterator();
//迭代循环it.hasNext()
while (it.hasNext()) {
System.out.println(it.next());
}
}
}