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Java中遍历Map对象的4种方法

April 1, 2022 • 默认分类

Map<String, String> map = new HashMap<String, String>();

// 第一种
for (String key : map.keySet()) {
   System.out.println("key= "+ key + " and value= " + map.get(key));
}
// 第二种
Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
while (it.hasNext()) {
   Map.Entry<String, String> entry = it.next();
   System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}
// 第三种
for (Map.Entry<String, String> entry : map.entrySet()) {
   System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}
// 第四种(只能遍历values)
for (String v : map.values()) {
   System.out.println("value= " + v);
}