Java String charAt()方法与示例
字符串charAt()方法
charAt()方法是Java中的String类方法，用于从给定字符串的指定索引中获取字符。
语法：
char String.charAt(index);
它接受索引并从String的指定位置返回字符。
注意：如果索引超出范围，则该方法将返回“字符串索引超出范围”异常。
示例
Input:
str = "includeHelp"
Function call:
str.charAt(0)
Output:
"i"码：
public class Main
{
public static void main(String[] args) {
String str = "includeHelp";
System.out.println("character at 0 index: " + str.charAt(0));
System.out.println("character at 1 index: " + str.charAt(1));
System.out.println("character at 2 index: " + str.charAt(2));
System.out.println("character at 3 index: " + str.charAt(3));
System.out.println("character at 4 index: " + str.charAt(4));
System.out.println("character at 5 index: " + str.charAt(5));
System.out.println("character at 6 index: " + str.charAt(6));
System.out.println("character at 7 index: " + str.charAt(7));
System.out.println("character at 8 index: " + str.charAt(8));
System.out.println("character at 9 index: " + str.charAt(9));
System.out.println("character at 10 index: " + str.charAt(10));
}
}输出结果
character at 0 index: i character at 1 index: n character at 2 index: c character at 3 index: l character at 4 index: u character at 5 index: d character at 6 index: e character at 7 index: H character at 8 index: e character at 9 index: l character at 10 index: p