java中如何将HashMap转换为TreeMap呢？

实现思路:
    使用treeMap的putAll方法
	即可将整个hashMap添加至treeMap中

package com.java265.other;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
public class Test16 {
	/**
	 * java265.com 示例程序
	 */
	public static void main(String... args) {
		Map<String, String> map = new HashMap<>();
		map.put("1", "java265.com-1");
		map.put("2", "java265.com-2");
		map.put("3", "java265.com-3");

		System.out.println("HashMap = " + map);

		Map<String, String> treeMap = new TreeMap<>();

		treeMap.putAll(map);

		System.out.println("TreeMap = " + treeMap);
	}
}

-------运行以上代码，将输出以下信息------
HashMap = {1=java265.com-1, 2=java265.com-2, 3=java265.com-3}
TreeMap = {1=java265.com-1, 2=java265.com-2, 3=java265.com-3}