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Java 1.5 For Macbook
Hello, World in Java 1.5 on Mac OS X
This document instructs you on how to setup a Java programmingenvironment for your Mac OS X computer and provides a step-by-stepguide for creating, compiling, and executing a Java program.You must be using Mac OS X v 10.4.2 Tiger or later.(Previous versions do not support Java 1.5.)All of the software is freely available on the Web.
You will use the Java compiler javac to compile your Java programs andthe Java interpreter java to run them.Mac OS X includes Apple's implementation of Java 2 Standard Edition (J2SE) 1.5.0.so there is nothing to do in this step except to run Software Updateif you're not up-to-date.
You will type commands in an application called the Terminal.You might enjoy reading Neal Stephenson's light-heartedessay In the Beginningwas the Command Line.
- Open a terminal window. You can find this underGo -> Applications -> Utilities. Drag the Terminal to your dock sinceyou will be using it frequently.
- You should now have a Terminal window somewhere on the screen.It will have a prompt that looks something like:
- To check that you have the right version of Java installed, typethe commands in boldface below.
If Java is installed, you should see something like:
Then type
You should see something like:
- Now, create a directory to store your Java programs.In the Terminal, type the commands in boldface below:
The mkdir command creates a new directory;the cd command changes the current working directory.After executing these commands, your working directoryis the newly created ~/introcs/hello. All of yourfiles for Assignment 0 will go here.Don't be intimidated by the Terminal - you will only need to use afew basic commands. Keep this window open since you will need it laterin the assignment.
- Since you will be using the Terminal frequently, you may want tocustomize the default window settings (e.g.,Monaco 13pt font with antialiasing).
- To check that you have the right version of Java installed, typethe commands in boldface below.
You will type and edit your programs in a text editor called JEdit.JEdit is similar to conventional word processors like MS Word,but it features many specialized programming tools includingsyntax highlighting, bracket matching, auto indenting, indentshifting, line numbering, and commenting out code.
- Downloadthe latest stable version of JEdit using the MacOSX package link.
- We strongly recommend the following JEdit customizations.
- Enable Mac OS style menubar inPlugins -> Plugin Options -> Enable Mac OS Menubar
- Change the default indentation to 4 spaces viaUtilities -> Global Options -> Editing -> Indent Width, Utilities -> Global Options -> Editing -> Tab Width, andUtilities -> Global Options -> Editing -> Soft (emulated with spaces) tabs.
- Change the default edit mode to Java usingUtilities -> Global Options -> Editing -> Default edit mode-> Java.
- Change the default tab width when printing to four spaces viaUtilities -> Global Options -> Printing -> Tab width when printing
- Add line numbers by checking Utilities -> Global Options -> Gutter -> Line Numbering
- Allow at most 80 characters per line byUtilities -> Global Options -> Editing -> Word wrap -> hard andUtilities -> Global Options -> Editing -> Wrap margin -> 80.
- Change the default line separator to Unix viaUtilities -> Global Options -> General -> Default Line Separator
- Remove the annoying . that marks the end of a line by uncheckingUtilities -> Global Options -> Text Area -> End of Line Markers
- To associate .java files with JEdit so that when you double-click a .java file,it opens it in JEdit:
- Right click a .java file.
- Choose Open With...
- Select JEdit from the list of programs or locate JEdit by selecting Otherif necessary.
- Check the Always use this program to open this file type box
Now you are ready to write your first Java program.
- Launch JEdit Start -> jEdit.Begin by saving the empty document: SelectFile -> Save As, choose the directory /Users/username/introcs/helloand type in the file name HelloWorld.java.The file name is case sensitive and must exactly match the name of the classin the Java program. Don't forget to include the .java extension in thefile name. By doing this, JEdit will know you are working on a Javafile, and it will format it appropriately.
- Now, in the JEdit window, type the Java program HelloWorld.javaexactly as it appears below.If you omit even a semicolon, the program won't work.
- Finally, save the file usingFile -> Save.
Java 1.5 Mac Os
It is now time to convert your Java program into a form moreamenable for execution on a computer.
- From the Terminal, type
- If everything went well, you should see the followingin the Terminal:
Silence is golden in computer science.If javac complains in some way, you mistyped something, and you should check your program carefully. Ask for help if you can't see the mistake.
- If everything went well, you should see the followingin the Terminal:
Now it is time to run your program. This is the fun part.
- At the Terminal, type
- If all goes well, you should see
- You may need to repeat this edit-compile-execute cycle a few times before it all goes smoothly.Use the up and down arrow keys to repeat previous commands and avoid extra typing.
Java 1.5 For Mac Mojave
When I try to run java I get: Exception in thread 'main' java.lang.NoClassDefFoundError.First, be sure that HelloWorld.class is in the current directory.Be sure to type java HelloWorld without a trailing .classor .java.If this was not your problem, it's possiblethat your CLASSPATH was set by some other program so that it no longerincludes the current working directory.Try running your program with the command line