StringBuffer类char charAt(int index) (StringBuffer Class char charAt(int index))

• This method is available in package java.lang.StringBuffer.charAt(int index).

  软件包java.lang.StringBuffer.charAt(int index)中提供了此方法。

• This method is used to return the character value at the specified index in the method.

  此方法用于返回方法中指定索引处的字符值。

• This method raises IndexOutOfBoundsException if the given index is negative or greater than the length of the StringBuffer object.

  如果给定的索引为负或大于StringBuffer对象的长度，则此方法引发IndexOutOfBoundsException 。

Syntax:

句法：

char charAt(int index){    }

Parameter(s):

参数：

We can pass only one object in the method of the StringBuffer i.e index.

我们只能在StringBuffer的方法(即索引)中传递一个对象。

Return value:

返回值：

The return type of this method is char that means this method return a character at the given index.

该方法的返回类型为char ，这意味着该方法在给定索引处返回一个字符。

Java程序演示charAt(int index)方法的示例 (Java program to demonstrate example of charAt(int index) method)

import java.lang.StringBuffer;public class StringBufferClass {
       public static void main(String[] args) {
           StringBuffer sb = new StringBuffer("Java is a programming language : ");        // use charAt(int index) it will return character at the specified index        // Display result after implementing charAt(2)        System.out.println("The result will be after implementing method charAt(2) is :" + sb.charAt(2));        sb = new StringBuffer("Java Support OOPS Concept");        // use charAt(int index) it will return character at the specified index        // Display result after implementing charAt(5)        System.out.println("The result will be after implementing method charAt(5) is :" + sb.charAt(5));    }}

Output

输出量

D:\Programs>javac StringBufferClass.javaD:\Programs>java StringBufferClassThe result will be after implementing method charAt(2) is :vThe result will be after implementing method charAt(5) is :S

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