autotext.java

本人在JAVA学习中的一点小实验

import java.util.*;
import java.lang.System.*;
class auto {
	double speed;
	public auto(double a){
	 speed=a;
	}
	public double  start(){
		speed=1;
		return speed;
	}
	public double speedup(double a){
		speed+=a;
		return speed;
	
	}
	public double stop(){
		speed=0;
		return speed;
	}
}
class bus extends auto{
	int passenger;
	public bus(){
	this(50,10);	
	}
	public bus(double a,int b){
		super(a);
		passenger=b;
	}
	public int goton(int a){
		passenger+=a;
		return passenger;
	}
	
		public int gotoff(int a){
		passenger-=a;
		return passenger;}
}
     public class autotext{
     	public static void main(String args[] ){
     		bus a=new bus();
     	System.out.println(""+a.goton(10));	
     	System.out.println(""+a.speedup(10));
     	System.out.println(""+a.start());	
     	}
     }