From Java9, the constructor of the class corresponding to primitive types is deprecated.

For details, see the following issue.

https://bugs.openjdk.java.net/browse/JDK-8176335

By the way, if you look at the Character source code ...

public static Character valueOf(char c) {
    if (c <= 127) { // must cache
        return CharacterCache.cache[(int)c];
    }
    return new Character(c);
}

In this way, the valueOf method has a cache mechanism, and the instance creation cost is low.

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