StringBuffer subSequence() in Java with Examples

The subSequence(int start, int end) method of StringBuffer class is the inbuilt method used to return a subsequence of characters lie between index start and end-1 of this sequence. The subsequence starts with the char value at the index start and ends with the char value at (end-1). The length of the returned subsequence is end-start. So if start is equal to end then an empty subsequence is returned.
Syntax:  

public CharSequence subSequence?(int start, int end)

Parameters: 
This method accepts two parameters:

1. start which is Integer type value refers to the start index of subsequence.
2. end which is Integer type value refers to the last index of subsequence.

Returns: 
This method returns the specified subsequence in range start to end-1. 
Exception: 
if start or end are negative, if end is greater than length(), or if start is greater than end then IndexOutOfBoundsException is thrown.
Below programs illustrate the java.lang.StringBuffer.subSequence() method: 
Example 1: 

Output: 

String length = 12 and contains = WelcomeGeeks
SubSequence = Welcome

Example 2: 

Output: 

String contains = Indian Team Played Well
SubSequence = Team Played

Example 3: When start > end:

Output: 

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
 at java.lang.AbstractStringBuffer.substring(AbstractStringBuffer.java:935)
 at java.lang.StringBuffer.substring(StringBuffer.java:76)
 at java.lang.AbstractStringBuffer.subSequence(AbstractStringBuffer.java:912)
 at java.lang.StringBuffer.subSequence(StringBuffer.java:76)
 at GFG.main(File.java:16)

References: 
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuffer.html#subSequence(int, int)