如何增加类Integer从另一个方法引用java中的值

package myintergertest;

/**
 *
 * @author Engineering
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        //this one does not increment 
        Integer n = new Integer(0);
        System.out.println("n=" + n);
        Increment(n);
        System.out.println("n=" + n);
        Increment(n);
        System.out.println("n=" + n);
        Increment(n);
        System.out.println("n=" + n);
        Increment(n);

        //this one will increment
        MyIntegerObj myInt = new MyIntegerObj(1);
        Increment(myInt);
        System.out.println("myint = " + myInt.get());
        Increment(myInt);
        System.out.println("myint = " + myInt.get());
        Increment(myInt);
        System.out.println("myint = " + myInt.get());

    }

    public static void Increment(Integer n) {
        //NO.  this doesn't work because a new reference is being assigned
        //and references are passed by value in java
        n++;
    }

    public static void Increment(MyIntegerObj n) {
        //this works because we're still operating on the same object
        //no new reference was assigned to n here.
        n.plusplus();   //I didn't know how to implement a ++ operator...
    }
}
package myintergertest;

/**
 *
 * @author Engi