Java初始化类而不重复自己

public class MyClass {
    private int value;

    public MyClass(int value) {
        this.value = value;
    }

    // 其他方法和属性...
}

public class MyClass {
    private static int value;

    static {
        value = 10;
    }

    // 其他方法和属性...
}

public class Singleton {
    private static Singleton instance;
    private int value;

    private Singleton() {
        value = 10;
    }

    public static Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }

    // 其他方法和属性...
}

public class MyClass {
    private int value;

    private MyClass(int value) {
        this.value = value;
    }

    public static MyClass createInstance(int value) {
        return new MyClass(value);
    }

    // 其他方法和属性...
}