testa.java

java课程的资料以及实验的代码

//TestA.java
public class TestA{
	public static void main(String[] args)
	{
		A a=new A(5,"java");
		System.out.println(a.toString());
		a.add(10,"Program");
		System.out.println(a.toString());
		a.clearA();
		System.out.println(a.toString());
	}
}
//A.java
class A
{
	private int data;
	private String str;
	public A()
	{
		data=0;
		str=null;
	}
	public A(int i,String k)
	{
		data=i;
		str=k;
		
	}
	public A add(int k,String s)
	{
		data+=k;
		str+=s;
		return this;
	}
	public A clearA()
	{
		this.data=0;
		this.str="";
		return this;
	}
	public String toString()
	{
		return "data="+data+"str="+str;
	}
}