passingdemo.java

来自「java 完全探索的随书源码」· Java 代码 · 共 35 行

public class PassingDemo {

  public void first() {
    xObject o = new xObject();
    // initialize an object and a primitive
    o.x   = 5;
    int x = 5;

    // pass them to another method and then recheck their values
    changeThem(x, o);
    System.out.println();
    System.out.println("Back in the original method");
    System.out.println("The value of o.x is now "+o.x);
    System.out.println("But, The value of x is still "+x);
  }

  public void changeThem (int x, xObject o) {
    x   = 9;
    o.x = 9;
    System.out.println("In the changeThem method");
    System.out.println("The value of o.x was changed to "+o.x);
    System.out.println("The value of x was changed to "+x);
  }

  public static void main(String args[]) {
    PassingDemo myDemo = new PassingDemo();
    myDemo.first();
  }
}


class xObject {
  public int x;
}