Java StringBuffer deleteCharAt(int index) 方法

2024年12月23日 | 阅读 2 分钟

Java StringBuffer 类的 deleteCharAt(int index) 方法用于删除此序列指定位置的字符。删除字符后，当前序列将缩短一个字符。

语法

参数

数据类型	参数	描述
int	索引	index 是要删除的字符的位置。

返回值

此 deleteCharAt(int index) 方法返回此对象。

Exception

StringIndexOutOfBoundsException - 如果索引为负数或大于或等于字符串缓冲区的长度()。

兼容版本

Java 1.2 及以上版本

示例 1

public class StringBufferDeleteCharAtExample1 {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer("javatpoint");
	    System.out.println("string1: " + sb);
	    // deleting the character at index 4
	    sb = sb.deleteCharAt(4);
	    System.out.println("After deleting: " + sb);
	   
	    sb = new StringBuffer("hello java");
	    System.out.println("string2: " + sb);
	    // deleting the character at index 5
	    sb = sb.deleteCharAt(5);
	    System.out.println("After deleting: " + sb);
	}
}

输出

string1: javatpoint
After deleting: javapoint
string2: hello java
After deleting: hellojava

示例 2

此 deleteCharAt(int) 方法在提供负数索引值时抛出异常。

public class StringBufferDeleteCharAtExample2 {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer("javatpoint");
	    System.out.println("string1: " + sb);
	    // try to delete the character at index value negative
	    sb = sb.deleteCharAt(-1);
	    System.out.println("After deleting: " + sb);
	}
}

输出

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.AbstractStringBuilder.deleteCharAt(Unknown Source)
	at java.lang.StringBuffer.deleteCharAt(Unknown Source)
	at StringBufferDeleteCharAtExample2.main(StringBufferDeleteCharAtExample2.java:6)
string1 = javatpoint

示例 3

删除位于 Character.charCount(thisSequence.codePointAt(index)) 方法索引值的字符。

public class StringBufferDeleteCharAtExample3 {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer("javatpoint");
	    System.out.println("string: " + sb);
	    // deleting string buffer using character count at code point
	    int cp = sb.codePointAt(0);
	    System.out.println("codepoint at 0: "+cp);
	    int totalCharacter =Character.charCount(cp);
	    System.out.println("total character at codepoint "+cp+" : " + totalCharacter);
	    sb = sb.deleteCharAt(totalCharacter);
	    System.out.println("after deleting at index "+totalCharacter +": "+ sb);
	}
} 

输出

string: javatpoint
codepoint at 0: 106
total character at codepoint 106 : 1
after deleting at index 1: jvatpoint

示例 4

在本例中，我们从用户处获取输入字符串和字符的索引。

import java.util.Scanner;

public class StringBufferDeleteCharAtExample4 {
	public static void main(String[] args) {
	    StringBuffer sb = new StringBuffer("");
	    
	    System.out.print("enter your string value: ");
	    Scanner sc = new Scanner(System.in);
	    sb.append(sc.nextLine());
	    
	    System.out.print("enter index: ");
        int index = sc.nextInt(); 
	   
        // deleting the character at input index
        System.out.println("after deleting resultant string: "+sb.deleteCharAt(index));
	    sc.close();
	}
}

输出

enter your string value: hello string
enter index: 3
after deleting resultant string: helo string

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Java StringBuffer deleteCharAt(int index) 方法

语法

参数

返回值

Exception

兼容版本

示例 1

示例 2

示例 3

示例 4

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Java StringBuffer delete(int start, int end) 方法

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