创建Vehicle接口,添加两个方法start（）和stop（）

import javax.swing.JOptionPane; interface Vehicle { public void start(int a); public void stop(int b); }

class Bus implements Vehicle { public void start(int a) {

System.out.println(\"Bus开车时的人数:\"+a); } public void stop(int a) {

System.out.println(\"Bus停车时的人数:\"+a); } } class Bike implements Vehicle{

public void start(int b) {

System.out.println(\"Bike开车时的人数:\"+b); } public void stop(int b) {

System.out.println(\"Bike停车时的人数:\"+b);} } public class InterfaceDemo {

public

static

void

main(String[]

args)

{

String

a=JOptionPane.showInputDialog(\"请输入Bus上star 时的人数！\");

int bus1=Integer.parseInt(a);

String b=JOptionPane.showInputDialog(\"请输入Bus上stop时的人数！\");

int bus2=Integer.parseInt(b);

String c=JOptionPane.showInputDialog(\"请输入Bike上star时的人数！\");

int bike1=Integer.parseInt(c);

String d=JOptionPane.showInputDialog(\"请输入Bike上的stop时人数！\");

int bike2=Integer.parseInt(d);

Bus bus=new Bus(); bus.start(bus1); bus.stop(bus2); Bike bike=new Bike(); bike.start(bike1); bike.stop(bike2); } }