Question

in java!!

Write a method to check prefix of two strings that have more than 3 characters. A 3-char prefix of a word “class” will be “cla”. The method should take two strings as parameters, then compare 3-char prefix of two strings.

Write a method to check suffix of two strings that have more than 3 characters. A 3-char suffix of a word “world” will be “rld”. The method should take two strings as parameters, then compare 3-char suffix of two strings.

Detail requirements of the methods are below:

Requirements:

1. Use Scanner object to take strings input from console.

2. Both methods should check the length of the input strings first. If any string is less than 3 characters, the method should show “String too short, please re-enter.” And ask inputs again until both strings equal or more than 3 characters.

3. If prefix or suffix matches, it should show “3-char prefix matched” or “3-char suffix matched”, and also show the matched 3 characters.

4. If prefix or suffix does not match, it should show “3-char prefix didn’t match” or “3-char suffix didn’t match”

Answer 1

Code -

import java.util.*;
public class Main
{
   public static void main(String[] args) {
   //variable declare
   String first, second;
   Scanner sc = new Scanner(System.in);
   do{
   //ask user to enter first string
       System.out.println("Enter first string");
       first = sc.next();
   //ask user to enter second string
       System.out.println("Enter second string");
       second = sc.next();
   }while(first.length()<3&&second.length()<3);
   //call function to check the prefix are equal or not
       checkPrefix(first,second);
   //call function to check the suffix are equal or not
   checkSuffix(first,second);
      
   }
   public static void checkPrefix(String a, String b){
   //get the first 3 char of string
   String first = a.substring(0, 3);
   String second = b.substring(0, 3);
   //check if they are equal
   if(first.equals(second)){
   System.out.println("3-char prefix matched");
   }
   else{
   System.out.println("3-char prefix didn’t match");
   }
  
   }
   public static void checkSuffix(String a, String b){
   //get the last 3 char of string
   String first = a.substring(a.length()-3, a.length());
   String second = b.substring(b.length()-3, b.length());
   //check if they are equal
   if(first.equals(second)){
   System.out.println("3-char suffix matched");
   }
   else{
   System.out.println("3-char suffix didn’t match");
   }
  
   }
}

Screenshots-