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)
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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。