我的代码有什么问题？通过二维数组

import java.util.Scanner; 

public class StreetPeople { 

private static Scanner keyboard = new Scanner(System.in); 


public static void main(String [] args){ 

    int houses; 
    int houseNumbers[]; 
    int count; 
    int houseAges[][] = new int[4][]; 
    int age; 
    int people; 


    System.out.print("How many houses on the street? : "); 
    houses = keyboard.nextInt(); 
    houseNumbers= new int[houses]; 

    for (count= 0; count < houses; count++) { 
     System.out.print("What is the next house number? : "); 
     houseNumbers[count] = keyboard.nextInt(); 

    } 

    for (count = 0; count < houseNumbers.length ; count++) { 
     System.out.print("How many people live in number "+ houseNumbers[count] + ": "); 
     people = keyboard.nextInt(); 
     houseAges[count] = new int[people]; 



     for (int i = 0 ; i < houseAges.length ; i++) { 

      System.out.print("What is the age of person " + (i+1) + ":"); 
      age = keyboard.nextInt(); 
      houseAges = new int[people][age]; 

     } 

    } 





    } 

}

这里迭代是控制台窗口输出（我的猜测得到了由堆栈溢出冷凝）：我的代码有什么问题？通过二维数组

How many houses on the street? : 4 
What is the next house number? : 1 
What is the next house number? : 3 
What is the next house number? : 4 
What is the next house number? : 6 
How many people live in number 1: 5 
What is the age of person 1: 32 
What is the age of person 2: 28 
What is the age of person 3: 12 
What is the age of person 4: 8 
What is the age of person 5: 5 
How many people live in number 3: 1 
What is the age of person 1: 84 
How many people live in number 4: 5 
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 
    at StreetPeople.main(StreetPeople.java:31)

代码工作完全正常，直到有。完全不知道为什么它适用于多次迭代，但不适用于房屋号码4

来源

2013-10-08 NickP

解释什么是预期行为以及为什么它看起来不正确。 – logoff

我预计它会创建一个大小为x的不规则数组，表示该房屋中有多少人居住，该数组中的每个元素将具有房屋中每个人的年龄。 – NickP

houseAges只有4行。

int houseAges[][] = new int[4][];

来源

2013-10-08 06:50:05 Guido

int houseAges[][] = new int[4][]; //这里的问题是

修复改变像下面

System.out.print("How many houses on the street? : "); 
    houses = keyboard.nextInt(); 
    houseNumbers= new int[houses]; 
    houseAges = new int[houses][]; //here you need to initialize houseAges

从您的代码

houseAges[count] = new int[people];

来源

2013-10-08 06:50:10 Prabhakaran

ahhh非常感谢 – NickP

我将它改为你发布的内容，但它仍然无效。该错误似乎在：houseAges [count] = new int [people]; – NickP

@NickD从您的代码中删除下面的行houseAges [count] = new int [people]; – Prabhakaran

这里删除以下行，固定大小。当你拨打下一个号码并出现错误时。

int houseAges[][] = new int[4][];

来源

2013-10-08 06:53:00

这是你的问题：

houseAges = new int[people][age];

您重新初始化houseAges阵列完全

现在既然在你的第三宫，你选择了1个人，那么你与一个人这使得初始化数组第二个索引上的循环崩溃（从现在开始houseAges第一维的大小为1）

来源

2013-10-08 06:54:48 giorashc

非常感谢你 – NickP

问题在于循环

for (int i = 0 ; i < houseAges.length ; i++) { 

     System.out.print("What is the age of person " + (i+1) + ":"); 
     age = keyboard.nextInt(); 
     houseAges = new int[people][age]; // i guess it should be houseAges[people][i] = age; no need to reallocate the entire array in every iteration 

    }

来源

2013-10-08 06:56:09

我的代码有什么问题？通过二维数组

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