Java StringBuffer delete(int start, int end) 方法

2024 年 12 月 23 日 | 阅读 2 分钟

Java StringBuffer 类的 delete(int start, int end) 方法用于从指定的起始索引（包含）到独占结束索引的该序列中删除子字符串。如果起始索引和结束索引相同，则不进行删除，并且该序列保持不变。

语法

参数

数据类型	参数	描述
StringBuffer	开始 (start)	字符序列的起始索引。
StringBuffer	end	字符序列的独占结束索引。

返回值

delete(int start, int end) 方法返回此对象。

Exception

StringIndexOutOfBoundsException - 如果起始索引为负数，或者任一索引大于 length()，或者起始索引大于结束索引。

兼容版本

Java 1.2 及以上版本

示例 1

public class StringBufferDeleteExample1 {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer("javatpoint");
	    System.out.println("string1: " + sb);
	    // deleting the substring from index 2 to 6
	    sb = sb.delete(2,6);
	    System.out.println("After deleting: " + sb);
	   
	    sb = new StringBuffer("let us learn java");
	    System.out.println("string2: " + sb);
	    // deleting the substring from index 0 to 7
	    sb = sb.delete(0, 7);
	    System.out.println("After deleting: " + sb);
	}
}

输出

string1: javatpoint
After deleting: jaoint
string2: let us learn java
After deleting: learn java

示例 2

在 delete(int,int) 方法中提供负数（或小于 0）索引会抛出异常。

public class StringBufferDeleteExample2 {
	public static void main(String[] args) {
	    StringBuffer sb = new StringBuffer("javatpoint");
	    System.out.println("string: " + sb);
	    //try to deleting the substring with index negative
	    sb = sb.delete(-2,6);
	    System.out.println("After deleting: " + sb);

	}
}

输出

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -2
	at java.lang.AbstractStringBuilder.delete(Unknown Source)
	at java.lang.StringBuffer.delete(Unknown Source)
	at StringBufferDeleteExample2.main(StringBufferDeleteExample2.java:6)
string: javatpoint

示例 3

将起始索引和结束索引提供为相同的值，不进行删除，并且该序列保持不变。

public class StringBufferDeleteExample3 {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer("java code");
	    System.out.println("string: " + sb);
	    //try to deleting the substring with index negative
	    sb = sb.delete(4,4);
	    System.out.println("After deleting: " + sb);

	}
}

输出

string: java code
After deleting: java code

示例 4

从用户那里获取字符串输入到字符串缓冲区中，并在 delete(int,int) 方法中使用它。

import java.util.Scanner;

public class StringBufferDeleteExample4 {
	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 start index: ");
        int start = sc.nextInt(); 
	    System.out.print("enter end index: ");
        int end = sc.nextInt(); 
        // printing the substring after deleting
        System.out.println("count: "+sb.delete(start,end));
	    sc.close();
	}
}

输出

enter your string value: string buffer
enter start index: 3
enter end index: 7
count: strbuffer

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Java StringBuffer delete(int start, int end) 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 deleteCharAt(int index) 方法

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