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Java String charAt()用法及代码示例


Java String charAt()方法返回指定索引处的字符。索引值应介于0到length()-1之间。签名:

 public char charAt(int index)  

参数:

 index- Index of the character to be returned.

返回:


 returns character at the specified position.

异常:

 StringIndexOutOfBoundsException- If index is 
 negative or greater then the length of the 
 String.

例:展示charAt()方法的用法原理

// Java program to demonstrate 
// working of charAt() method 
  
class Gfg { 
    public static void main(String args[]) 
    { 
        String s = "Welcome! to Geeksforgeeks Planet"; 
  
        char ch = s.charAt(3); 
        System.out.println(ch); 
  
        ch = s.charAt(0); 
        System.out.println(ch); 
    } 
}
输出:
c
W
// Java program to demonstrate 
// working of charAt() method 
  
class Gfg { 
    public static void main(String args[]) 
    { 
        String s = "abc"; 
  
        char ch = s.charAt(4); 
        System.out.println(ch); 
    } 
}
输出:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException:String index out of range:4
    at java.lang.String.charAt(String.java:658)
    at Gfg.main(File.java:9)



Java中的字符串类



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注:本文由纯净天空筛选整理自Niraj_Pandey大神的英文原创作品 Java String charAt() method with example。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。