What is the string subSequence() method in Java?

The subSequence() method in Java is used to return a subsequence of a sequence.

Syntax

The subSequence() method can be declared as shown in the code snippet below:

public CharSequence subSequence(int start, int end)
  • start (inclusive): The index from which the subsequence will start.
  • end (exclusive): The index at which the subsequence will end.

Return value

The subSequence() method returns the subsequence of the sequence.

Note: The subSequence() method throws the IndexOutOfBoundsException if any of the following conditions are met:

  • start is less than 0.
  • end is less than 0.
  • start is greater than end.
  • end is greater than the length of the string.

Example

Consider the code snippet below, which demonstrates the use of the subSequence() method.

import java.lang.Math;
  
class Main {
    public static void main(String args[])
    {
  
        String str = "subSequence() example";
        System.out.println("str: " + str);
        System.out.println("subStr: " + str.subSequence(0, 13));
    }
}

Explanation

A string str is declared in line 8. The subSequence() method is used in line 11 to get the subsequence of str.

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