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Replace Substring in Java

Replace all occurrences of a substring in a string.

BeginnerModule 4: String ProgramsExample 13 of 25

replace-substring.java

1import java.util.Scanner;
2
3public class Main {
4    public static void main(String[] args) {
5        Scanner sc = new Scanner(System.in);
6        System.out.print("Enter main string: ");
7        String s = sc.nextLine();
8        System.out.print("Enter substring to replace: ");
9        String oldSub = sc.nextLine();
10        System.out.print("Enter new substring: ");
11        String newSub = sc.nextLine();
12
13        String result = s.replace(oldSub, newSub);
14        System.out.println("Result: " + result);
15        sc.close();
16    }
17}

Output

Enter main string: I like C
Enter substring to replace: C
Enter new substring: Java
Result: I like Java

What's going on

We use String.replace to swap all occurrences of a substring.

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