Java 1 Help

• In this exercise we write a program that copies two numbers from an input stream to the console
• Create a new Java file and name it TwoNumbers.
• Then, let's create a text file to test our program.
• In Eclipse, click on the name of the project. Then, go to File->New->File
• Name your text file infile.txt.
• In the file, add a list of numbers each on their own line, like this:

10 20

• We will read from this file in our program.

• Now, we will create a second text file.
• Click on the name of the project again. Then, go to File->New-File
• Name this file outfile.txt
• Now, open TwoNumbers.java.
• Add a main method and place the following import statement above main:

  import java.io.*; 

• Also, as part of the signature of main(), add throws IOException:

  public static void main(String[] args) throws IOException{ 

• Declare two int variables at the top of main:

int first;

int second;

• Add code to create a new File object:

  File inFile = new File("infile.txt");

• Add statements to read two numbers from the input stream. For example, here is the correct code for reading the first number:

  Scanner input = new Scanner(inFile); first = input.nextInt(); 

• Close the stream when finished reading:

  input.close(); 

• Next, we will add some code to write to a file.
• Declare a new File variable for the outfile.txt:

File outFile = new File("outfile.txt");

• Next, declare a PrintWriter variable and connect it to this File:

PrintWriter out = new PrintWriter(outFile);

• Using the PrintWriter, we will write some text into our outfile:

out.println("first=" + first);

//add a line of code to print the second number here

• Lastly, close the PrintWriter:

out.close();

• Compile and run your modified program to make sure you made the changes correctly.
• When you run the code, nothing should appear on the console.
• Instead, open outfile.txt in Eclipse and verify that you have the following contents in your file:

  first=10 second=20