In this article, we will discuss StringBuilder’s delete() method which deletes sub–string starting from specified start–index to end–index

1. StringBuilder’s delete() method :

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

1.1 Method Signature:

public StringBuilder delete(int start, int end);

1.2 Returns:

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

1.3 Throws:

• StringIndexOutOfBoundsException, if index value passed falls out of range i.e.;
  1. if either start-index or end-index is negative (<0)
  2. if start-index is greater than end-index
  3. if end-index is greater than length()

2. Examples on delete() method :

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

StringBuilderDeleteMethod.java

package in.bench.resources.string.methods;

public class StringBuilderDeleteMethod {

	public static void main(String[] args) {

		// StringBuilder - 1
		StringBuilder sb1 = new StringBuilder("Google.com");

		// removes character from start-index to end-index
		sb1.delete(3, 6); 

		// print to console
		System.out.println("1. removing "
				+ "StringBuilder content from 3-6 : " + sb1);

		// StringBuilder - 2
		StringBuilder sb2 = new StringBuilder("Oracle.com"); 

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

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

Output:

1. removing StringBuilder content from 3-6 : Goo.com
2. after clearing StringBuilder contents   :

Related Articles :

• Java – StringBuilder class
• Java – StringBuilder append() method (13)
• Java – StringBuilder capacity() method
• Java – StringBuilder charAt(int index) method
• Java – StringBuilder delete(int start, int end) method
• Java – StringBuilder deleteCharAt(int index) method
• Java – StringBuilder ensureCapacity(int minimumCapacity) method
• Java – StringBuilder indexOf() method (2)
• Java – StringBuilder insert() method (12)
• Java – StringBuilder lastIndexOf() method (2)
• Java – StringBuilder length() method
• Java – StringBuilder replace(int start, int end, String str) method
• Java – StringBuilder reverse() method
• Java – StringBuilder substring(int start, int end) method

References :

• https://docs.oracle.com/javase/tutorial/essential/concurrency/immutable.html
• https://docs.oracle.com/javase/tutorial/essential/concurrency/imstrat.html
• https://docs.oracle.com/javase/tutorial/java/data/strings.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/String.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/class-use/String.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuffer.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html

Happy Coding !!
Happy Learning !!