Java 中 StringBuffer deleteCharAt()方法，带示例

原文:https://www . geesforgeks . org/stringbuffer-delete charat-method-in-Java/

Java . lang . stringbuffer . delete charat()是一个内置的 Java 方法，它会移除序列中指定位置的字符。这样序列就减少了 1 个字符。

语法:

public StringBuffer deleteCharAt(*int indexpoint*)

参数:该方法接受整数类型的单个参数索引点，该索引点是指要删除的字符的索引。 返回值:该函数返回字符串或删除字符后返回该对象。 异常:如果索引点为负或者大于等于 length()，则该方法抛出StringIndexOutOfBoundsException。

示例:

Input : StringBuffer = worldofgeeks
        int indexpoint = 4
Output : worlofgeeks

以下程序说明了 StringBuffer.deleteCharAt()方法的工作: 程序 1:

// Java program to demonstrate working
// of StringBuffer.deleteCharAt() method

import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        StringBuffer sbf = new StringBuffer("raghav");
        System.out.println("String buffer before deletion = " + sbf);

        // Deleting the character at indexpoint 5
        sbf.deleteCharAt(5);
        System.out.println("After deletion new StringBuffer = " + sbf);
    }
}

输出:

String buffer before deletion = raghav
After deletion new StringBuffer = ragha

程序 2:

// Java program to demonstrate working
// of StringBuffer.deleteCharAt() method

import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        StringBuffer sbf = new StringBuffer("GeeksforGeeks");
        System.out.println("String buffer before deletion = " + sbf);

        // Deleting the character at indexpoint 5
        sbf.deleteCharAt(5);
        System.out.println("After deletion new StringBuffer = " + sbf);
    }
}

输出:

String buffer before deletion = GeeksforGeeks
After deletion new StringBuffer = GeeksorGeeks

程序 3:

// Java program to demonstrate working
// of StringBuffer.deleteCharAt() method

import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        StringBuffer sbf = new StringBuffer("Abhishek");
        System.out.println("String buffer before deletion = " + sbf);

        // Deleting the character at indexpoint -5
        sbf.deleteCharAt(-5);
        System.out.println("After deletion new StringBuffer = " + sbf);
    }
}

输出:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: 
                                             String index out of range: -5
    at java.lang.AbstractStringBuilder.deleteCharAt
                                          (AbstractStringBuilder.java:824)
    at java.lang.StringBuffer.deleteCharAt(StringBuffer.java:441)
    at Geeks.main(Geeks.java:14)

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