Java - How to create new Entry (key, value)

I'd like to create new item that similarly to Util.Map.Entry that will contain the structure key, value.

The problem is that I can't instantiate a Map.Entry because it's an interface.

Does anyone know how to create a new generic key/value object for Map.Entry?

You can just implement the Map.Entry<K, V> interface yourself:

java中如何创建Entry对象？因为Map.Entry是一个接口，所以无法直接new。

答案：需要自己去创建一个对象，实现Map.Entry接口

import java.util.Map;

final class MyEntry<K, V> implements Map.Entry<K, V> {
    private final K key;
    private V value;

    public MyEntry(K key, V value) {
        this.key = key;
        this.value = value;
    }

    @Override
    public K getKey() {
        return key;
    }

    @Override
    public V getValue() {
        return value;
    }

    @Override
    public V setValue(V value) {
        V old = this.value;
        this.value = value;
        return old;
    }
}

使用：

Map.Entry<String, Object> entry = new MyEntry<String, Object>("Hello", 123);
System.out.println(entry.getKey());
System.out.println(entry.getValue());