a4_23.java

JAVA的课后作业题答案.. 并且附带了调试结果和原码 原理是利用APPLET和事件响应

interface OneToN {
	abstract int  disp();
}
class Sum implements OneToN
{
	private int n;
	public Sum (int n){
       this.n=n;
	}
	public int disp(){
		return (1+n)*n/2;
	}
}
class Pro implements OneToN
{
	private int n;
	public Pro(int n){
		this.n=n;
	}
	public int disp(){
	      int ji=1;
		 int i;
		for (i=1;i<=n ;i++ )
		{
			ji*=i;
		}
        return ji;
	}
}
public class a4_23
{
    public static void main(String args[])
	{ 
       //这里我们初始化n变量5
		Pro pro =new Pro(5);
	    Sum sum =new Sum(5);
        System.out.println("这是积"+pro.disp());
        System.out.println("这是和"+sum.disp());
	}
}