在Java语言中，如果我将方法arg作为- myMethod(myObjectReference)或myMethod(新MyObject)传递，有什么区别？

public class MyClass {
    private int value;

    public void setValue(int value) {
        this.value = value;
    }

    public int getValue() {
        return value;
    }
}

public class Main {
    public static void main(String[] args) {
        MyClass myObject = new MyClass();
        myObject.setValue(10);

        System.out.println("Before: " + myObject.getValue()); // 输出: Before: 10

        modifyObject(myObject);

        System.out.println("After: " + myObject.getValue()); // 输出: After: 20
    }

    public static void modifyObject(MyClass obj) {
        obj.setValue(20);
    }
}

public class MyClass {
    private int value;

    public void setValue(int value) {
        this.value = value;
    }

    public int getValue() {
        return value;
    }
}

public class Main {
    public static void main(String[] args) {
        MyClass myObject = new MyClass();
        myObject.setValue(10);

        System.out.println("Before: " + myObject.getValue()); // 输出: Before: 10

        modifyObject(new MyClass());

        System.out.println("After: " + myObject.getValue()); // 输出: After: 10
    }

    public static void modifyObject(MyClass obj) {
        obj.setValue(20);
    }
}