为什么从arraylist进行打印时，数组超出边界数组? [英] why do i get an array out of bounds array when printing from arraylist?

问题描述

我似乎无法理解为什么我尝试打印的数组在尝试将其追加到JTextArea时会抛出超出范围的错误.

i cant seem to understand why the array i am trying to print throws an array out of bounds error when i try to append it to a JTextArea.

两个数组都已初始化为从零开始.

Both arrays have been initialized to start at zero.

          private ArrayList<String> UniResponse = new ArrayList(0);
          private ArrayList<String> CHOICES = new ArrayList(0);

uniPicksString，UniResponse和CHOICES是从其他对象传递来的数组，但是它们也已初始化为从0开始；

uniPicksString, UniResponse, and CHOICES are arrays that have been passed from a different object, however they have also been initialized to start at 0;

此方法以字符串类型返回数组列表的元素

this method returns the elements of the array list as a string type

String receiveAdminResponse() {
    Iterator<String> itr = UniResponse.iterator();
    String hold = null;
    int count=0;
    System.out.println("\n  inside Student class = pringint decision array");

    for (count = 0;count < UniResponse.size(); count++) {
        System.out.println(UniResponse.get(count));
    }

    while(itr.hasNext() && count<UniResponse.size()) {
        hold = UniResponse.get(count);  
    }
    return hold;

}

这是创建附加到JTextArea的字符串的方法

this is the method that creates the string that is appended to JTextArea

String returnProfile() {
    String studentInfo =FAMILYNAME+", " + "average = " + AVERAGE + " \n";
    String uniPicksString ="";

    for (int i = 0; i<CHOICES.size(); i++) {            
        if(i<CHOICES.size() - 1) {
            uniPicksString = uniPicksString +CHOICES.get(i)+ ": " + ApplicantArray.get(i).receiveAdminResponse();//"admin decision, " ;
        }else {
            uniPicksString = uniPicksString + CHOICES.get(i)+ ": " +  ApplicantArray.get(i).receiveAdminResponse();//"admin decision" + "\n" ;
        }   
    }   
    return studentInfo  + uniPicksString + "\n";
}

是否可以创建一条try catch语句，该语句将忽略引发的错误并打印arraylist?

is it possible to create a try catch statement that will ignore the error thrown and print the arraylist?

任何建议都非常感谢.

推荐答案

正如评论所说，applicantArray最有可能小于choices.

As the comments say, most likely the applicantArray is smaller then choices.

仍然，count等于UniResponse.size()，因此while循环条件从一开始就评估为false，因此您返回了null值.

Still, count equals UniResponse.size() therefore the while loop condition evaluates to false from the beginning and so you return a null value.

不，它不会改变任何东西，很难理解您的需求...

No that it changes anything, it's hard to understand what you need...

是否可以创建一条try catch语句，该语句将忽略抛出的错误并打印arraylist?

is it possible to create a try catch statement that will ignore the error thrown and print the arraylist?

try / catch与不相处忽略忽略错误

此外，第二个函数中的if语句也没有用.在if和else主体中，您所做的事情都非常相同.

Also, the if statement in your second function is useless. You do the very same in thing in both the if and the else body.

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