首页java遍历map的几种方法

java遍历map的几种方法

时间: 2023-11-28 08:46:06 浏览: 157

以下是Java遍历Map对象的几种方法： 1. 使用for-each循环遍历Map对象 ```java Map<String, Integer> map = new HashMap<>(); for (Map.Entry<String, Integer> entry : map.entrySet()) { String key = entry.getKey(); Integer value = entry.getValue(); System.out.println("Key: " + key + ", Value: " + value); } ``` 2. 使用Lambda表达式遍历Map对象 ```java Map<String, Integer> map = new HashMap<>(); map.forEach((key, value) -> System.out.println("Key: " + key + ", Value: " + value)); ``` 3. 使用Iterator迭代器遍历Map对象 ```java Map<String, Integer> map = new HashMap<>(); Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String, Integer> entry = iterator.next(); String key = entry.getKey(); Integer value = entry.getValue(); System.out.println("Key: " + key + ", Value: " + value); } ``` 4. 使用Stream API遍历Map对象 ```java Map<String, Integer> map = new HashMap<>(); map.entrySet().stream().forEach(entry -> System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue())); ```

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