第14章 集合类

集合类练习

package fourteen;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

public class third {
	public String id;
	public String na;
	public third(String id,String na){
		this.id =id;
		this.na=na;
	}
	public static void main(String[] args) {
		Map<String,String> map=new TreeMap<String, String>();
		third e1=new third("251","哈哈");
		third e2=new third("241","哈哈哈");
		third e3=new third("259","哈哈哈哈");
		third e4=new third("356","哈哈哈");
		map.put(e1.id,e1.na);
		map.put(e2.id,e2.na);
		map.put(e3.id,e3.na);
		map.put(e4.id,e4.na);
		map.put("15", "好好");
		
		Set<String> set=map.keySet();
		set.remove("241");
		Iterator<String> it=set.iterator();
		while (it.hasNext()){
			String t=(String)it.next();
			System.out.println(t+" "+map.get(t));
		}
	}
}

运行结果：
15 好好
251 哈哈
259 哈哈哈哈
356 哈哈哈