从外部访问Class的实例变量

public class MyClass {
    private int myInstanceVariable;

    public MyClass(int value) {
        myInstanceVariable = value;
    }

    public int getMyInstanceVariable() {
        return myInstanceVariable;
    }

    public void setMyInstanceVariable(int value) {
        myInstanceVariable = value;
    }
}

public class Main {
    public static void main(String[] args) {
        MyClass myObject = new MyClass(10);
        System.out.println("My instance variable: " + myObject.getMyInstanceVariable());
        myObject.setMyInstanceVariable(20);
        System.out.println("My instance variable after update: " + myObject.getMyInstanceVariable());
    }
}