Java language basics : Exercises

Prereqs:

• This lesson is for people with no Java experience.
• You are encouraged to read the JS curriculum , as it contains valuable information which we will build upon in these exercises.
• The JS curriculum can be found here: https://github.com/gSchool/java-curriculum . Unit 01 syntax can be read.

Lesson objectives: By the end of this unit, you should be able to :

• Fluently set up Java classes and write methods that use various Java primitives.
• Fluently explain the difference between public and private methods and variables
• Execute functions based on user input

imports needed:

import javax.swing.JOptionPane;
import java.util.Random;
import java.util.Arrays;

I do:

• Compile and run a basic Java program using Atom and the command line.
• (If you're doing this at home, see https://github.com/gSchool/java-curriculum/tree/master/Unit-1-Syntax )

We do:

• (Same as above) : Compile and run a basic Java program using Atom and the command line.

We do:

• Set up a Java project in Eclipse
• (video if you're stuck): https://github.com/Nmuta/java_sandbox/blob/master/JavaProjectSetup.mov

We do:

• Discuss variable types: int, double , float, String, boolean, char
• Discuss arrays
• Use System.out to manipulate and echo variables in the console
• Use System.out in a loop to echo out all numbers in an array
• Discuss Strings and String concatenation

We do:

• Accepting input from the user

String city_choice = JOptionPane.showInputDialog("Where do you live? ");

You do : (Exercise ) :

• Accept a user's name , and after that information is accepted, System.out "Hello name , your name has number characters " !

I do:

• Functions and function scope

You do:

• Outsource your "Hello name .... written above " ! functionality to a function.

I do:

• Demonstrate the use of Math.random

int rand_num = new Random().nextInt(8);

You do:

• Create a random array of food dishes. In the code above, when you greet the user, greet them with a random food item from the list. For example :

Greetings, Jacq ! Please enjoy this plate of spaghetti . 

where spaghetti is a random food from the list.

Finish !