mapdemo.java

来自「java是一种面向对象程序的语言,我这里介绍了有关java课件的许多事例,它能帮」· Java 代码 · 共 31 行

package book.ch6;

import java.util.*;

public class MapDemo {
	public static void main(String[] args) {
		Map map=new HashMap();
		map.put("1", "value1");
		map.put("2", "value2");
		map.put("3", "value3");
		map.put("4", "value4");

		System.out.println(map.get("1"));

		Set keySet = map.keySet();
		for (Iterator iterator = keySet.iterator(); iterator.hasNext();) {
			System.out.println(iterator.next());
		}

		Collection values = map.values();
		for (Iterator iterator = values.iterator(); iterator.hasNext();) {
			System.out.println(iterator.next());
		}

		Set entrySet = map.entrySet();
		for (Iterator iterator = entrySet.iterator(); iterator.hasNext();) {
			System.out.println(iterator.next());
		}
	}
}