Question

Write a java program:

Write a program that creates a text file. Write to the file three lines each line having a person's name. In the same program Append to the file one line of  'Kean University'.  In the same program then Read the file and print the four lines without lines between.

Answer 1

The following code will do the job required. THUMBS UP if it helps :)

Main.java

import java.io.*;
  
public class Main {
  
public static void appendStrToFile(String fileName, String str)
{
try {
BufferedWriter out = new BufferedWriter(
new FileWriter(fileName, true));
out.write(str);
out.close();
}
catch (IOException e) {
System.out.println("exception occoured" + e);
}
}
  
public static void main(String[] args)
throws Exception
{
File mFile = new File("output.txt");
String str = "Kean University";
try {
BufferedWriter out = new BufferedWriter(
new FileWriter(mFile));
out.write("Alice\n");
out.write("Danny\n");
out.write("Diana\n");
out.close();
// Changing Text.
BufferedReader in = new BufferedReader(new FileReader("output.txt"));
  
String mystring;
while ((mystring = in.readLine()) != null) {
str = str + "\n" + mystring;
}
mFile.delete();
}
catch (IOException e) {
System.out.println("Exception Occurred" + e);
}
appendStrToFile("output.txt", str);
//printing
BufferedReader in = new BufferedReader(new FileReader("output.txt"));
String stringFile;
while ((stringFile = in.readLine()) != null) {
System.out.println(stringFile);
}
  
}
}

OUTPUT

1) output.txt before running append.

2)After Running Code.

Hope it helped :)