Java StringBuffer delete()用法及代碼示例

java.lang.StringBuffer.delete()是Java中的內置方法，用於刪除或刪除此序列的子字符串中的字符。子字符串從指定的索引start_point開始，並擴展到在索引end_point處的字符。

用法:

public StringBuffer delete(int start_point, int end_point)

參數：該方法接受兩個整數類型的參數：
start_point–這是指起始索引，並包含在計數中。
end_point–這指的是結束索引，不包括在計數中。

返回值：在刪除參數中提到的範圍所形成的子字符串後，該方法將返回字符串。

異常：如果start_point為負，大於length()，或者大於end_point，則發生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

以下程序說明了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); 
    } 
}

輸出：

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); 
    } 
}

輸出：

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

示例3:此處索引為負。

// 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); 
    } 
}

輸出：

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:此處沒有索引。

// 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); 
    } 
}

輸出：

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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