defaultvalue5.java

这是一些java小程序的源码

//c3:DefaultValue5.java
//author:ZhangHongbin 
//This program is protected by copyright laws.
//reference value of objects.  
class Primitive
{
	boolean t;
  
}
public class DefaultValue5
{
	Primitive k; 
	Primitive m; 
	int num;
	public static void main(String[] args)
	{
	
		//part1
		DefaultValue5 D=new DefaultValue5();
		DefaultValue5 P=new DefaultValue5();
		System.out.println("D  after creation="+D);
		System.out.println("P  after creation="+P);

		System.out.println("num of D1="+D.num);
		System.out.println("num of P1="+P.num);
		D.num=2;
		System.out.println("num of D2="+D.num);
		System.out.println("num of P2="+P.num);
		//part2
		System.out.println("k  before creation="+D.k);
		System.out.println("m  before creation="+D.m);
		D.k = new Primitive();
		System.out.println("k  after creation="+D.k);
		//part3
		Primitive d = new Primitive();
		System.out.println("d  after creation="+d);
		//part4
		System.out.println("boolean of d1=" +d.t );
		System.out.println("boolean of k1=" +D.k.t );
		d.t=true;
		System.out.println("boolean of d2=" +d.t );
		System.out.println("boolean of k2=" +D.k.t );
	}
}