Java Program of String Concatenation


The authority of XYZ gated residential colony wants its residents’ name datum Should be stored in the following format – residents’ name <space> his/her father’s name. Write a program to concat the father’s name to the residents’ name. The name should be validated,on validation, the name should contain only alphabets and space is allowed. If the name is not valid display the message “Invalid name”. If valid string then convert it to uppercase and print it.. 

[Use concat(String s) of the String class.]

Sample Input 1:

Inmate’s name:Aron

Inmate’s father’s name:Terby

Sample Output 1:


Sample Input 2:

Inmate’s name:Mary Anto

Inmate’s father’s name:Jose

Sample Output 2:


Sample Input 3:

Inmate’s name:Dev12

Inmate’s father’s name:Terby

Sample Output 3:

Invalid name


import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Authority
    public static void main (String[] args) {
        Scanner sc=new Scanner(;
        System.out.println("Inmate's name:");
        String in_name=sc.nextLine();
        System.out.println("Inmate's father's name:");
        String fa_name=sc.nextLine();
        Pattern p=Pattern.compile("[^a-z ]", Pattern.CASE_INSENSITIVE);
        Matcher m=p.matcher(in_name);
        Matcher m1=p.matcher(fa_name);
        if(m.find()==false && m1.find()==false)
           System.out.println(((in_name.concat(" ")).concat(fa_name)).toUpperCase()); 
            System.out.println("Invalid name");


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