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Reading and Writing Console Input and Output Practice

Output in Java Playground

The Java Playground is great for trying out segments of code, but if we write print statements to show that the output doesn't move to the next line unless you wrap the statements into a block of code using { at the start and } at the end. Without the statements being included in a block of code, it will treat each print statement distinctly and not behave as expected. Try the following in the Java Playground.

Prepare Your IDE

Another option is to move over to an IDE. If you need help, please reference the Getting Set-up page.

In this section, we will be using preview features in JDK 24. To use features that are still in preview, you will need to enable preview features in your IDE.

  1. Create a .java file. The file name should start with an uppercase letter.
  2. Use the following main method template. Add your statements to the body of the main method. A comment is in the body of the main. A comment is ignored by the compiler. Comments are added to the program code to help programmers understand what the program code does. There are three types of comments:
    • single-line comments start with //
    • multi-line comments start with /* and end with */
    • document comments, which generate documentation, start with /** and end with */

Practice Set 1 - Predict the Output of Code

For each of the following code segments:

  • predict what will be generated as output
  • test the program code in an IDE. (If you choose to use the Java Playground, remove void main() as the Java Playground does not require you to use a main method.)

A - Taco Stand Order

B - Number of Total Customers

Practice Set 2 - Write Program Code for Input and Output

Ask yourself these guiding questions prior to writing the program code:

  • What data is the program using?
  • What data is being produced?
  • What is the type of this data?
  • What are good variables names for this data?
  • What are the steps to write the program?

A - Displaying a Game Score

In an IDE or using the Java Playground:

  • create a variable called score
  • set the value of score to 150.
  • write an output statement that uses the variable score and produces the following output:

Player 1 score is 150

B - Input and Format an Address

In an IDE:

  • create variables for the following:
    • street address
    • city
    • state
    • postal code
  • write statements to prompt users to input these values
  • print the address in the following format:

street address

city, state postal code

For example:

123 Hello World Dr.

San Fransico, CA 12345

C - Hotel Staffing

For a hotel, print out how many rooms can be cleaned given a number of workers for the day. A worker will have 5 hours a day when they can clean rooms. Each room takes 2 workers, 15 minutes to clean. You will need to obtain the number for the day from the user. Only an even number of workers will be scheduled.