To start, create a new Java project in your preferred IDE. In Eclipse, for example, you can do this by selecting "File" > "New" > "Java Project". Name your project something like "JavaGame" and choose a location to save it.
import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;
public static void main(String[] args) new JavaGame();
if (ballX < 0
public static void main(String[] args) new JavaGame();
Once you're happy with your game, you'll want to export it as a JAR file. In Eclipse, you can do this by right-clicking on your project and selecting "Export". Choose "Java" > "Runnable JAR file" and follow the prompts to create a JAR file.