How to get all the possible Substrings of a String in Java - Step by Step Examples

How to get all the possible Substrings of a String in Java ?

Answer

To get all possible substrings of a string in Java, you can use nested loops to iterate through each combination of start and end indices.

✐ Examples

1 All Substrings of "Hello"

In this example,

We create a string named str with a value of "Hello".
We initialize an empty list named substrings to store all substrings.
We use nested loops to iterate through each possible start and end index combination.
For each combination, we extract the substring using substring method and add it to the substrings list.
Finally, we print the substrings list.

Java Program

import java.util.ArrayList;
import java.util.List;

// All Substrings of "Hello"
public class Main {
    public static void main(String[] args) {
        String str = "Hello";
        List<String> substrings = new ArrayList<>();
        for (int i = 0; i < str.length(); i++) {
            for (int j = i + 1; j <= str.length(); j++) {
                substrings.add(str.substring(i, j));
            }
        }
        System.out.println("All substrings: " + substrings);
    }
}

Output

All substrings: [H, He, Hel, Hell, Hello, e, el, ell, ello, l, ll, llo, l, lo, o]

Summary

In this tutorial, we learned How to get all the possible Substrings of a String in Java language with well detailed examples.

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