使用对另一个hashmap的引用来克隆hashmap

HashMap<String, String> originalMap = new HashMap<>();
// 添加键值对到原始HashMap
originalMap.put("key1", "value1");
originalMap.put("key2", "value2");

// 使用对另一个HashMap的引用来克隆HashMap
HashMap<String, String> clonedMap = originalMap;

// 修改克隆后的HashMap
clonedMap.put("key3", "value3");

// 输出原始HashMap和克隆后的HashMap
System.out.println("Original HashMap: " + originalMap);
System.out.println("Cloned HashMap: " + clonedMap);

Original HashMap: {key1=value1, key2=value2, key3=value3}
Cloned HashMap: {key1=value1, key2=value2, key3=value3}

HashMap<String, String> originalMap = new HashMap<>();
// 添加键值对到原始HashMap
originalMap.put("key1", "value1");
originalMap.put("key2", "value2");

// 创建一个新的HashMap并复制原始HashMap中的所有键值对
HashMap<String, String> clonedMap = new HashMap<>(originalMap);

// 修改克隆后的HashMap
clonedMap.put("key3", "value3");

// 输出原始HashMap和克隆后的HashMap
System.out.println("Original HashMap: " + originalMap);
System.out.println("Cloned HashMap: " + clonedMap);

Original HashMap: {key1=value1, key2=value2}
Cloned HashMap: {key1=value1, key2=value2, key3=value3}