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String subSequence in Java

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The Java String subSequence is a Java String Method used to return a new character sequence that is a subsequence of the user-specified string.

In this article, we will show how to use String subSequence in Java Programming language with example.

Syntax of a String subSequence in Java

The syntax of the string.subSequence in Java Programming language is as shown below.

The following method will accept the integer value that is the starting index position (Starting_index), where the extraction will start as the first parameter. And the last index position (End_index), where the character sequence will end as the second argument. String.subSequence method will return the character sequence starting from the Starting_index up to End_index but not included.

public CharSequence subSequence(int Startig_index, int End_index); // It will return Character Sequence 

//In order to use in program
String_Object.subSequence(int Startig_index, int End_Index)
  • String_Object: Please specify the valid String Object.
  • Starting_Index: Please specify the starting index position. It is the index position where the extraction of the character sequence will start.
  • End_Index: Please specify the ending index position. Java String.subSequence function will return up to this index position, but it will not include the character at this position (End_index).

Example for String subSequence in Java

The string.subSequence method extracts the part of a string and returns in a new string. This program will help to understand the string.subSequence method.

//String. substring in Java example
package StringFunctions;

public class SubSequenceMethod {
	public static void main(String[] args) {
		String str = "Tutorials on Java Programming";
		String str1 = "We are abc working at abc company";
		
		System.out.println("subSequence of str = " + str.subSequence(0, 10));
		System.out.println("subSequence of str1 = " + str1.subSequence(0, 12));
		
		System.out.println("subSequence of str = " + str.subSequence(5, 10));
		System.out.println("subSequence of str1 = " + str1.subSequence(5, 12));
		
		System.out.println("subSequence of str = " + str.subSequence(6, str.length()));
		System.out.println("subSequence of str1 = " + str1.subSequence(5, str1.length()));
	}
}

OUTPUT

String subSequence in Java 1

ANALYSIS

It will call the public CharSequence subSequence (int Starting_Index, int End_Index) method and return the character sequence starting from index 0 to index position 9

System.out.println("subSequence of str = " + str.subSequence(0, 10));

This statement will call the public CharSequence subSequence (int Starting_Index, int End_Index) method and return the character sequence starting from index 5 to index position 9

System.out.println("subSequence of str = " + str.subSequence(5, 10));

The following String Method will return the character sequence starting from index 6 to the end of the string. Here, we used the Java String length function to find the string length

System.out.println("subSequence of str = " + str.subSequence(6, str.length()));