StringBuffer delete() Method in Java with Examples (original) (raw)

Last Updated : 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 startpoint, int endpoint)

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);
}

}

`

Output:

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);
}

}

`

Output:

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);
}

}

`

Output:

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);
}

}

`

Output:

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)