Java StringBuilder delete()用法及代碼示例

StringBuilder類的delete(int start，int end)方法從StringBuilder包含的String中刪除從索引start到index end-1的字符。此方法使用兩個索引作為參數，第一個開始代表第一個字符的索引，結束索引代表要從StringBuilder包含的String中刪除的子字符串的最後一個字符之後的索引，並將剩餘的String作為StringBuilder對象返回。

用法:

public StringBuilder delete(int start, int end)

參數：此方法接受兩個參數：

start：子字符串的第一個字符的索引。
end：子字符串最後一個字符之後的索引。

返回值：刪除子字符串後，此方法返回此StringBuilder對象。

異常：如果start小於零，或者start大於String的長度，或者start大於end，則此方法引發StringIndexOutOfBoundsException。

下麵的程序演示StringBuilder類的delete()方法：

示例1:

// Java program to demonstrate 
// the delete() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder 
            str 
            = new StringBuilder("WelcomeGeeks"); 
  
        // print string 
        System.out.println("Before removal String = "
                           + str.toString()); 
  
        // remove the substring from index 2 to 8 
        StringBuilder afterRemoval = str.delete(2, 8); 
  
        // print string after removal of substring 
        System.out.println("After removal String = "
                           + afterRemoval.toString()); 
    } 
}

輸出：

Before removal String = WelcomeGeeks
After removal String = Weeeks

示例2:

// Java program to demonstrate 
// the delete() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder 
            str 
            = new StringBuilder("GeeksforGeeks"); 
  
        // print string 
        System.out.println("Before removal String = "
                           + str.toString()); 
  
        // remove the substring from index 8 to 8 
        StringBuilder afterRemoval = str.delete(8, 8); 
  
        // start equal to end so no change in string 
        // print string after removal of substring 
        System.out.println("After removal of SubString"
                           + " start=8 to end=8"
                           + " String becomes => "
                           + afterRemoval.toString()); 
  
        // remove the substring from index 1 to 8 
        afterRemoval = str.delete(1, 8); 
  
        // print string after removal of substring 
        System.out.println("After removal of SubString"
                           + " start=1 to end=8"
                           + " String becomes => "
                           + afterRemoval.toString()); 
    } 
}

輸出：

Before removal String = GeeksforGeeks
After removal of SubString start=8 to end=8 String becomes => GeeksforGeeks
After removal of SubString start=1 to end=8 String becomes => GGeeks

示例3:演示IndexOutOfBoundException

// Java program to demonstrate 
// exception thrown by the delete() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder 
            str 
            = new StringBuilder("GeeksforGeeks"); 
  
        try { 
  
            // make start greater than end 
            StringBuilder afterRemoval = str.delete(7, 4); 
        } 
  
        catch (Exception e) { 
            System.out.println("Exception: " + e); 
        } 
    } 
}

輸出：

Exception: java.lang.StringIndexOutOfBoundsException

參考：
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#delete(int, int)

相關用法

注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 StringBuilder delete() in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。