In this article, we will discuss how to extract all possible substrings from a string in Java

This is a frequently asked interview question.

Let’s look at the below example, to find all substrings in a string.

package com.topjavatutorial;

public class AllSubstrings {

  public static void main(String[] args) {
    String input = "abcd";
    allSubStrings(input);
  }

  private static void allSubStrings(String value) {
    String substring = "";
    for (int i = 1; i < value.length(); i++) {
      
      for (int j = 0; j <= value.length() - i; j++) {
        substring = value.substring(j, i + j);
        System.out.println(substring);
      }
    }
  }
}

Output :

a
b
c
d
ab
bc
cd
abc
bcd

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