如果值不同，则拒绝put的Java映射

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class ConditionalPutExample {
    private final ConcurrentMap<String, String> map = new ConcurrentHashMap<>();

    public boolean putIfValueMatches(String key, String newValue, String expectedValue) {
        return map.compute(key, (k, v) -> {
            if (v == null || !v.equals(expectedValue)) {
                return v; // 如果键不存在或值不匹配，则返回旧值，即拒绝更新
            }
            return newValue; // 如果值匹配，则更新为新值
        }) == newValue; // 返回是否成功更新
    }

    public static void main(String[] args) {
        ConditionalPutExample example = new ConditionalPutExample();
        example.map.put("key1", "value1");

        // 尝试更新，值匹配，应该成功
        boolean result1 = example.putIfValueMatches("key1", "newValue1", "value1");
        System.out.println("Update result: " + result1); // 应该输出 true

        // 尝试更新，值不匹配，应该失败
        boolean result2 = example.putIfValueMatches("key1", "newValue2", "value1");
        System.out.println("Update result: " + result2); // 应该输出 false
    }
}