Substring in java | java beginners tutorial

Substring in java

Substring is a method in the String class that allows to get a subset of a String.

Substring in java methods

There are two methods offered by the String class that return a substring :

public String substring(int startIndex)

this method returns a new string that starts from startIndex inclusive and finishes at the original string’s last index inclusive also (the last index of the original string is at the index originalString.length() -1 )

substring in java example 1

The substring example below displays the substring of the string « abderrahmen » beginning from the index 4 inclusive and finishing at the last index of that string (10 = 11-1)

public class substring {

  public static void main(String[] args){
    String myString = "abderrahmen";
    String substring = myString.substring(4);
    System.out.println(substring);

  }
}

The output of the codeabove is the following :

rrahmen

public String substring(int startIndex, int endIndex)

This method returns a new string beginning from a starting index and finishing at a final index. (the caracter at the final index is excluded from the resulting string )

Substring in java example 2

The substring example below displays the substring of the string « abderrahmen » beginning from the index zero and finishing at the index three (the caracter at the index 3 is excluded).

public class substring {

  public static void main(String[] args){
    String myString = "abderrahmen";
    String substring = myString.substring(0, 3);
    System.out.println(substring);

  }
}

The displayed string is the following :

abd

This core JAVA tutorial which deals with the substring method in java arrives at its end.

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