Java高级之HashMap中的entrySet()方法使用

public class Demo {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("abc", "123");
        map.put("efg", "456");
        // 使用增强型for遍历循环Map集合
        Set<Map.Entry<String, String>> entrySet = map.entrySet();
        for (Map.Entry<String, String> entry : entrySet) {
            System.out.println(entry.getKey() + "->" + entry.getValue());
        }
    }
}

    public Set<Map.Entry<K, V>> entrySet() {
        Set<Map.Entry<K, V>> es;
        return (es = entrySet) == null ? (entrySet = new EntrySet()) : es;
    }

    
    public Set<Map.Entry<K, V>> entrySet() {
        Set<Map.Entry<K, V>> es;
        return (es = entrySet) == null ? (entrySet = new EntrySet()) : es;
        
    }

public class Demo {
    public Demo() {
    }
 
    public static void main(String[] args) {
        Map<String, String> map = new HashMap();
        map.put("abc", "123");
        map.put("efg", "456");
        Set<Entry<String, String>> entrySet = map.entrySet();
        Iterator var3 = entrySet.iterator();
 
        while(var3.hasNext()) {
            Entry<String, String> entry = (Entry)var3.next();
            System.out.println((String)entry.getKey() + "->" + (String)entry.getValue());
        }
 
    }
}