Replace Substring

Replace all occurrences of a substring in a string.

JavaBeginner

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter main string: ");
        String s = sc.nextLine();
        System.out.print("Enter substring to replace: ");
        String oldSub = sc.nextLine();
        System.out.print("Enter new substring: ");
        String newSub = sc.nextLine();

        String result = s.replace(oldSub, newSub);
        System.out.println("Result: " + result);
        sc.close();
    }
}

Output

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

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

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