The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
Below is the source code for ExampleGame
. For simplicity, ExampleGame
does not actually contain code to play a game. It simply retrieves or updates a user's high score.
To see what the user's current high score value is, you could run:
java ExampleGame get
To set a new high score value for the user, you could run:
java ExampleGame set score
To retrieve the user's current high score, ExampleGame
simply instantiates a HighScore
object and makes a call to its getHighScore
method. To set a new high score for the user, ExampleGame
instantiates a HighScore
object and calls setHighScore
, passing it the user's new high score.
Here is the source code for ExampleGame
,
ExampleGame.java
:
package com.gamedev.games; import java.io.*; import java.security.*; import java.util.Hashtable; import com.scoredev.scores.*; public class ExampleGame { public static void main(String args[]) throws Exception { HighScore hs = new HighScore("ExampleGame"); if (args.length == 0) usage(); if (args[0].equals("set")) { hs.setHighScore(Integer.parseInt(args[1])); } else if (args[0].equals("get")) { System.out.println("score = "+ hs.getHighScore()); } else { usage(); } } public static void usage() { System.out.println("ExampleGame get"); System.out.println("ExampleGame set <score>"); System.exit(1); } }