Java数组索引超出范围的esception [英] Java arrays index out of bounds esception

问题描述

应该创建名称由数组名称指定的文件的代码，但错误是



线程中的esceptionmainjava.lang.ArrayIndexOutOfBoundsException：5

in inout.ArrayWriteFiles.main（ArrayWriteFiles.java:30）

 public class ArrayWriteFiles 
 {
 
 public static void main（String [] args）throws IOException 
 {
 String [] Names = new String [5]; 
姓名[0] =Android; 
 Names [1] =java; 
 Names [2] =computerscience; 
姓名[3] =卫星; 
姓名[4] =沟通; 
 for（int i = 0; i< = Names.length; i ++）{
 String fileName =name+ Names [i] +。html; 
 PrintWriter printer = new PrintWriter（fileName，UTF-8）; 
 printer.write（Java是面向对象的）; 
 printer.close（）; 
} 
} 
} 

我尝试了什么：



更改了代码并搜索了java类

解决方案

for循环中的条件是

 i< = Names.length; 

这里Names.length在你尝试访问的最后一次迭代中计算结果为5数组索引为5的元素，对于长度为5的数组是不可能的。



尝试将条件更改为

我< Names.length; 

GKP1992 已经给你正确答案了。

但请注意，你也可以用这种方式编写循环（参见 for Statement - Java教程 - 学习Java语言 - 语言基础知识 [ ^ ]）

  for （ String 名称：名称）
 {
 字符串 fileName =   name + name +  。html; 
  //   ...  
} 
 

code that should create files with names as specified by array Names, however the error is

"Esception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
at inout.ArrayWriteFiles.main(ArrayWriteFiles.java:30)"

public class ArrayWriteFiles 
{      

public static void main(String[] args) throws IOException
{         
        String[] Names = new String[5]; 
        Names[0] = "Android";
        Names[1] = "java";
        Names[2] = "computerscience";
        Names[3] = "satellite";
        Names[4] = "communication";        
  for(int i=0 ; i<=Names.length ; i++){
  String fileName = "name" + Names[i] + ".html";
  PrintWriter printer = new PrintWriter(fileName, "UTF-8");   
  printer.write("Java is object oriented"); 			
  printer.close();
  }
}
} 

What I have tried:

changed code and searched java classes

解决方案

The condition in your for loop is

i<=Names.length;

Here Names.length evaluates to 5 to for the last iteration you try to access the element at array index 5 which is not possible for an array of length 5.

Try changing the condition to

i < Names.length;

GKP1992 already gave you the correct answer.
However, please note, you may also write the loop this way (see The for Statement - The Java Tutorials - Learning the Java Language - Language Basics [^])

for(String name : Names)
{
  String fileName = "name" + name + ".html";
  //...
}

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