在Java中将HashMap转换为TreeMap的程序

首先创建一个HashMap-

Map<String, String> map = new HashMap<>(); map.put("1", "One"); map.put("2", "Two"); map.put("3", "Three"); map.put("4", "Four"); map.put("5", "Five"); map.put("6", "Six");

现在，将上面的HashMap转换为TreeMap-

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

示例

以下是在Java中将HashMap转换为TreeMap的程序-

import java.util.*; import java.util.stream.*; public class Demo { public static void main(String args[]) { Map<String, String> map = new HashMap<>(); map.put("1", "One"); map.put("2", "Two"); map.put("3", "Three"); map.put("4", "Four"); map.put("5", "Five"); map.put("6", "Six"); map.put("7", "Seven"); map.put("8", "Eight"); map.put("9", "Nine"); System.out.println("HashMap = " + map); Map<String, String> treeMap = new TreeMap<>(); treeMap.putAll(map); System.out.println("TreeMap (HashMap to TreeMap) " + treeMap); } }

输出结果

HashMap = {1=One, 2=Two, 3=Three, 4=Four, 5=Five, 6=Six, 7=Seven, 8=Eight, 9=Nine} TreeMap (HashMap to TreeMap) {1=One, 2=Two, 3=Three, 4=Four, 5=Five, 6=Six, 7=Seven, 8=Eight, 9=Nine}