Java StringBuffer delete()用法及代码示例

java.lang.StringBuffer.delete()是Java中的内置方法，用于删除或删除此序列的子字符串中的字符。子字符串从指定的索引start_point开始，并扩展到在索引end_point处的字符。

用法:

public StringBuffer delete(int start_point, int end_point)

参数：该方法接受两个整数类型的参数：
start_point–这是指起始索引，并包含在计数中。
end_point–这指的是结束索引，不包括在计数中。

返回值：在删除参数中提到的范围所形成的子字符串后，该方法将返回字符串。

异常：如果start_point为负，大于length()，或者大于end_point，则发生StringIndexOutOfBoundsException。

例子：

Input: String = "Apple"
            start_point = 2 
            end_point = 4

Output: Ape

Input: String = "GeeksforGeeks"
       start_point = 2 
       end_point = 7

Output: GerGeeks

以下程序说明了java.lang.StringBuffer.delete()方法：
示例1:

// Java praogram to illustrate the 
// java.lang.StringBuffer.delete() 
import java.lang.*; 
  
public class geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Geeksforgeeks"); 
        System.out.println("string buffer = " + sbf); 
  
        // Deleting characters from index 2 to 7 
        sbf.delete(6, 8); 
        System.out.println("After deletion string buffer is = " + sbf); 
    } 
}

输出：

string buffer = Geeksforgeeks
After deletion string buffer is = Geeksfgeeks

示例2:

// Java praogram to illustrate the 
// java.lang.StringBuffer.delete() 
import java.lang.*; 
  
public class geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Welcome to Geeksforgeeks"); 
        System.out.println("string buffer = " + sbf); 
  
        // deleting characters from index 5 to index 9 
        sbf.delete(5, 9); 
        System.out.println("After deletion string buffer is = " + sbf); 
    } 
}

输出：

string buffer = Welcome to Geeksforgeeks
After deletion string buffer is = Welcoo Geeksforgeeks

示例3:此处索引为负。

// Java praogram to illustrate the 
// java.lang.StringBuffer.delete() 
import java.lang.*; 
  
public class geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Welcome to Geeksforgeeks"); 
        System.out.println("string buffer = " + sbf); 
  
        sbf.delete(-5, 9); 
        System.out.println("After deletion string buffer is = " + sbf); 
    } 
}

输出：

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: 
                                         String index out of range: -5
    at java.lang.AbstractStringBuilder.delete(AbstractStringBuilder.java:756)
    at java.lang.StringBuffer.delete(StringBuffer.java:430)
    at geeks.main(geeks.java:13)

示例4:此处没有索引。

// Java praogram to illustrate the 
// java.lang.StringBuffer.delete() 
import java.lang.*; 
  
public class geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuffer sbf = new StringBuffer("Welcome to Geeksforgeeks"); 
        System.out.println("string buffer = " + sbf); 
  
        sbf.delete(99, 109); 
        System.out.println("After deletion string buffer is = " + sbf); 
    } 
}

输出：

Exception in thread "main" java.lang.StringIndexOutOfBoundsException
    at java.lang.AbstractStringBuilder.delete(AbstractStringBuilder.java:760)
    at java.lang.StringBuffer.delete(StringBuffer.java:430)
    at geeks.main(geeks.java:13)

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注：本文由纯净天空筛选整理自ankita_chowrasia大神的英文原创作品 StringBuffer delete() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。