请问下我这个JAVA程序是哪里出错了

//对象

package shangjizuoye;

import java.util.*;

public class zuoye_3 {
String[] thing = new String[2];
double[] price = new double[2];
String custNo;
int num;

Scanner input = new Scanner(System.in);
public void sellstore(){
thing[0] = "1.addidas运动鞋";
price[0] = 420.0;
thing[1] = "2.addidasT恤";
price[1] = 500.0;
thing[2] = "3.Nike运动鞋";
price[2] = 1000.0;
System.out.println(thing[0]+"\t"+price[0]);
System.out.println(thing[1]+"\t"+price[1]);
System.out.println(thing[2]+"\t"+price[2]);
}





public void display(){
System.out.println("我行我素购物管理系统 > 购物结算");
System.out.println("\n\n\n");
System.out.println("******************************************************************************");
System.out.println("请选择购买的商品编号:");
System.out.println("\n\n\n");
System.out.println("请输入会员号");
custNo = input.next();
String answer = "";
double total=0;
do{
for(int i = 0;i<=2;i++){

System.out.println("请输入商品编号：");
thing[i] = input.next();
System.out.println("请输入购买数量：");
num = input.nextInt();
total = num*price[i];
System.out.println(thing[i]+"\t"+"￥"+price[i]+"\t"+"￥"+total);
System.out.println("\n");

}
System.out.println("是否继续(y/n):");
answer = input.next();
}while(answer.equals("y"));
double sale = 0.8;
System.out.println("折扣："+sale);
total = total*0.8;
System.out.println("金额总计：￥"+total);
int finalgive = 400;
System.out.println("实际交费：￥"+finalgive);
double backmoney = 0;
backmoney = finalgive - total;
System.out.println("找钱：￥"+backmoney);
int score = 0;
score = (int)total/100;
System.out.println("本次购物所获得的积分是："+score);

}

}

测试类：

package shangjizuoye;

public class Testzuoye_3 {

public static void main(String[] args) {
zuoye_3 t = new zuoye_3();
t.sellstore();
t.display();

}

}

麻烦来个高手帮下忙，谢谢了！

你好，很高兴为你回答，请看如下解释↓↓↓↓↓

========================================================================

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at JavaTest.zuoye_3.sellstore(Testzuoye_3.java:17)
at JavaTest.Testzuoye_3.main(Testzuoye_3.java:94)

这是你的java程序的报错信息。

是数组越界了。。你在定义String和double两个数组的时候数组长度是2，后面使用过程中却使用了三个数组元素，所以越界了，修改很简单的，看我的代码

String[] thing = new String[3];
double[] price = new double[3];

只要把这两行代码的数组大小设为3即可。。

======================================================================

祝你愉快

数组越界.....

楼主要注意下类名哦... 不能小写的

数组越界,控制台有错误提示,去看看错误提示,多看看就懂了

数组越界

上面的数组定义的大小是2

所以你赋值的时候最大下标应该只能到1

import java.util.*;

class zuoye_3 { String[] thing = new String[3]; double[] price = new double[3]; String custNo; int num;

Scanner input = new Scanner(System.in); public void sellstore(){ thing[0] = "1.addidas运动鞋"; price[0] = 420.0; thing[1] = "2.addidasT恤"; price[1] = 500.0; thing[2] = "3.Nike运动鞋"; price[2] = 1000.0; System.out.println(thing[0]+"\t"+price[0]); System.out.println(thing[1]+"\t"+price[1]); System.out.println(thing[2]+"\t"+price[2]); }

public void display(){ System.out.println("我行我素购物管理系统 > 购物结算"); System.out.println("\n\n\n"); System.out.println("******************************************************************************"); System.out.println("请选择购买的商品编号:"); System.out.println("\n\n\n"); System.out.println("请输入会员号"); custNo = input.next(); String answer = ""; double total=0; do{ for(int i = 0;i<=2;i++){

System.out.println("请输入商品编号："); thing[i] = input.next(); System.out.println("请输入购买数量："); num = input.nextInt(); total = num*price[i]; System.out.println(thing[i]+"\t"+"￥"+price[i]+"\t"+"￥"+total); System.out.println("\n");

} System.out.println("是否继续(y/n):"); answer = input.next(); }while(answer.equals("y")); double sale = 0.8; System.out.println("折扣："+sale); total = total*0.8; System.out.println("金额总计：￥"+total); int finalgive = 400; System.out.println("实际交费：￥"+finalgive); double backmoney = 0; backmoney = finalgive - total; System.out.println("找钱：￥"+backmoney); int score = 0; score = (int)total/100; System.out.println("本次购物所获得的积分是："+score);

}

}

public class Testzuoye_3 {

public static void main(String[] args) { zuoye_3 t = new zuoye_3(); t.sellstore(); t.display();

}

}