编写一个简单的JAVA APPLICATION程序

Question

提示：从键盘输入应付金额和实付金额后，计算并输出找零或欠付金额，
本人是菜鸟，刚学JAVA还不会编写程序，哪位知道做的帮下忙啊

Answer 1

import java.util.*;

public class Charge{
public static void main (String[] args) {
Scanner s = new Scanner(System.in);
while(true){
System.out.print("请输入应付金额：");
float a=s.nextFloat();
System.out.print("请输入实付金额：");
float b=s.nextFloat();
if(a<b)System.out.println("应找零钱"+(b-a)+"元");
else if(a>b)System.out.println("欠付金额"+(a-b)+"元");
else System.out.println("付款正好");
}
}
}

Answer 2

public class Test{
public static void main(String args[]) {
java.util.Scanner input = new java.util.Scanner(System.in);
System.out.print("应付:");
int oughtPay = input.nextInt();
System.out.print("实付:");
int factPay = input.nextInt();
if(factPay>=oughtPay)
System.out.println("找零:"+(factPay-oughtPay));
else
System.out.println("欠款:"+(oughtPay-factPay));
}
}

Answer 3

来了：

import java.io.*;
public class Charge
{
public static void main(String[] args) throws IOException
{
InputStreamReader reader = new InputStreamReader(System.in);
BufferedReader input = new BufferedReader(reader);
System.out.print("输入应付金额：");
double money1 = Double.parseDouble(input.readLine());
System.out.print("输入实付金额：");
double money2 = Double.parseDouble(input.readLine());
if (money1 < money2)
{
System.out.println("找零"+(money2-money1)+"元");
}
else if (money1 == money2)
{
System.out.println("谢谢光临");
}
else
{
System.out.println("对不起，欠付"+(money1-money2)+"元");
}
}
}