关于类和方法的问题-在方法中创建类的对象

public class MyClass {
    private int value;

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

    public void printValue() {
        System.out.println("Value: " + value);
    }

    // 在方法中创建类的对象
    public static MyClass createInstance(int value) {
        return new MyClass(value);
    }

    public static void main(String[] args) {
        // 直接实例化
        MyClass obj1 = new MyClass(10);
        obj1.printValue();

        // 使用工厂方法创建实例
        MyClass obj2 = MyClass.createInstance(20);
        obj2.printValue();
    }
}

import java.lang.ref.WeakReference;

public class MyClass {
    private int value;

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

    public void printValue() {
        System.out.println("Value: " + value);
    }

    public static WeakReference<MyClass> createWeakInstance(int value) {
        return new WeakReference<>(new MyClass(value));
    }

    public static void main(String[] args) {
        WeakReference<MyClass> weakRef = MyClass.createWeakInstance(30);
        MyClass obj3 = weakRef.get();
        if (obj3 != null) {
            obj3.printValue();
        }
    }
}