StringBuffer delete() Method in Java with Examples

02 Feb, 2022
The java.lang.StringBuffer.delete() is an inbuilt method in Java which is used to remove or delete the characters in a substring of this sequence. The substring starts at a specified index start_point and extends to the character at the index end_point.
Syntax :
public StringBuffer delete(int start_point, int end_point)
Parameters : The method accepts two parameters of integer type:start_point – This refers to the beginning index and is included in the count.end_point – This refer to the ending index and is excluded from the count.
Return Value : The method returns the string after deleting the substring formed by the range mentioned in the parameters.
Exceptions : StringIndexOutOfBoundsException occurs if the start_point is negative, greater than length(), or greater than the end_point.
Examples :
Input: String = "Apple"
            start_point = 2 
            end_point = 4

Output: Ape

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

Output: GerGeeks

Below programs illustrate the java.lang.StringBuffer.delete() method:Program 1:
java
// Java program 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);    }}
string buffer = Geeksforgeeks
After deletion string buffer is = Geeksfgeeks

Program 2:
java
// Java program 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);    }}
string buffer = Welcome to Geeksforgeeks
After deletion string buffer is = Welcoo Geeksforgeeks

Program 3: Here the index is negative.
java
// Java program 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);    }}
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)

Program 4: Here the index is not present.
java
// Java program 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);    }}
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)

anikaseth98
adnanirshad158
Java-Functions
Java-lang package
java-StringBuffer
Java-Strings
Java
Java-Strings
Java
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