Java: StringBuffer delete() method

In this article, we will discuss StringBuffer’s delete() method which deletes substring starting from specified start index-position to end index-position


delete() method:

  • This method deletes portion of the invoking StringBuffer
  • That’s substring starting from specified start index-position till end-1 index-position

Method Signature:

public StringBuffer delete(int start, int end);


  • Returns resulting StringBuffer object after deleting portion of string or substring
  • Substring starts from specified start index-position and ends at specified end index-position
  • Note: Start index-position is inclusive and end index-position exclusive


StringIndexOutOfBoundsException, if index value passed falls out of range i.e.;

  • if either start-index or end-index is negative (<0)
  • if start-index is greater than end-index
  • if end-index is greater than length()


Examples on delete() method:

  • To delete sub-string from invoking StringBuffer object for the specified range

package in.bench.resources.stringbuffer.methods;

public class StringBufferDeleteMethod {

	public static void main(String[] args) {

		// StringBuffer - 1
		StringBuffer sb1 = new StringBuffer("BenchResources.Net");

		// removes character from start-index to end-index
		sb1.delete(5, 14); 

		// print to console
		System.out.println("1. removing StringBuffer"
				+ " content from 5-14  : " + sb1);

		// StringBuffer - 2
		StringBuffer sb2 = new StringBuffer("BenchResources.Net"); 

		// to clear all contents of StringBuffer
		sb2.delete(0, sb2.length()); 

		// print to console
		System.out.println("2. after clearing StringBuffer"
				+ " contents     : " + sb2);


1. removing StringBuffer content from 5-14  : Bench.Net
2. after clearing StringBuffer contents     : 




Happy Coding !!
Happy Learning !!

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