Question

I have a text file that looks like this:

Hello

a/m

The letter "a" is a command that is supposed to append the letter "m" that is followed by the slash to the end of the word "Hello"

How would I write a Java program to read and scan the file, and when the letter "a" is found, it appends "m" to the phrase "Hello"?

The output should print "Hellom"

Answer 1

import java.io.*;  
import java.util.Scanner; 
import java.util.*;

public class append {
        public static void main(String args[])  
        {  
                try  
                {  
                        //the file to be opened for reading  
                        FileInputStream f=new FileInputStream("G:/Java worksplace/file/src/file/input.TXT");       
                        Scanner sc=new Scanner(f);    //file to be scanned  
                        String s1=""; // initialize the output the string with ""
                        while(sc.hasNextLine())  // Checks if the file has another line to read
                        {  
                                String s= sc.nextLine();
                                if(s.contains("Hello"))
                                        s1=s; // initializes the output string to Hello if it is the first line which contains hello.
                                if(s.startsWith("a"))
                                        s1=s1+s.charAt(2); // when the letter "a" is found, it appends "m" to the phrase "Hello" i.e our output string s1
                        }  
                        System.out.println(s1);
                        sc.close();     //closes the scanner  
                }  
                catch(IOException e)  
                {  
                        e.printStackTrace();  
                }  
        }  
}

This is the screenshot of the program :

This is the screenshot of the Output :