example432

几个简单的java学习代码

  class Location{
	int x,y;
  }


  class Point{
	int x,y;

	Point( ){
	     x=20;
	     y=30;
	}

	void getXY( int xValue, int yValue ){
		xValue=x;
		yValue=y;
	}

	void getLocation( Location lReference ){
		lReference.x=x;
		lReference.y=y;
	}
   }


   public class ArgumentTest{
	
	public static void main( String args[ ] ){
		Point p=new Point( ); 
		int xValue=-1, yValue=-1;

		System.out.println("Pass by value:");
		p.getXY(xValue,yValue);
		System.out.println("xValue = "+xValue+" yValue = "+yValue);

		Location l=new Location( );
		p.getLocation( l ); //label 2 : pass by reference
		System.out.println("Pass by reference:");
		System.out.println("l.x = "+l.x+" l.y = "+l.y);

	}
  }

　

运行结果为：

C:\>java ArgumentTest

Pass by value:

xValue = -1 yValue = -1

Pass by reference:

l.x = 20  l.y = 30