Updated Oct 3 2013: This tutorial is compatible with XCode 5 AND XCode 4! We’re taking a practical approach to learning iOS programming. This means lots of hands on work and practice! In order to benefit the most from these lessons, you should open XCode and try to follow along. This is part 4 of the lesson plan. Because Xamarin.Mac integrates directly with Xcode, the developer can use Xcode's Interface Builder to create an app's user interfaces (or optionally create them directly in C# code). Additionally, since Xamarin.Mac applications are written in C# and.NET, code can be shared with Xamarin.iOS and Xamarin.Android mobile apps; all while delivering.

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In a better world, no one would have to use Java anymore. Sadly there are still university programs where people are expected to use Java. Rather than cast people into the world of Eclipse, here are instructions on how to get Xcode building Java. These instructions are current as of Xcode 4.6.2. You will need to download a JDK from somewhere.

This is a basic environment meant only for writing simple school programs. It has no debugger. Replace <MyProject> with whatever you want to name your project. Your main project file, main project class, and Xcode project must use this name. Welcome to Java.

1) In Xcode, File > New > New Project > Other > External Build System

2) Give it a meaningful name <MyProject> and save it somewhere. Note the name. You'll need that later.

3) File > New > New File > Other > Empty

4) Give it a Java-friendly name. In my example, use <MyProject>.java

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5) Copy the contents below into the file and save.

6) File > New > New File > Other > Empty

7) Save as Makefile.

8) Copy the contents below into the file and save.

9) The 'Run' (>) button should at least compile your Java now.

Now it gets tricky. You don't have to do the next part. You could just open a Terminal to your project directory and run java <MyProject> if you want. I strongly suggest that. You can also just type 'make' and use Xcode purely as a text editor.

9) Project > Scheme > Edit Scheme > Debug > Info tab

10) Executable > Other > type ^⌘g > type /usr/bin > choose java

11) Change Debugger to None

12) Arguments tab

13) For Arguments Passed on Launch, add $(TARGETNAME)

14) For Environment Variables, add CLASSPATH with a value of $(PROJECT_DIR)

15) For Expand Variables based on, use <MyProject>

16) Click the 'Run' (>) button.

PS: I have no idea how to run the Java debugger in Xcode. But then, I have no idea how to run the Java debugger at all.

Here are some starter file contents:

HelloWorld.java:

publicclass HelloWorld

{

publicstaticvoid main(String[] args)

{

System.out.println('Hello, World!');

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}

}

Makefile:

# A simple makefile for a Hello World Java program

# Define a makefile variable for the java compiler

JCC = javac

# Define a makefile variable for compilation flags

# The -g flag compiles with debugging information

JFLAGS = -g

# typing 'make' will invoke the first target entry in the makefile

# (the default one in this case)

default: $(subst .java,.class,$(wildcard *.java))

# this target entry builds the Average class

# the Average.class file is dependent on the Average.java file

# and the rule associated with this entry gives the command to create it

#

%.class : %.java

$(JCC) $(JFLAGS) $<

# To start over from scratch, type 'make clean'.

# Removes all .class files, so that the next make rebuilds them

#

clean:

$(RM) *.class

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NOTE: Those indentations are true tab characters. Ugh!

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Good luck on your class. Hopefully you can progress onto more complicated projects and eventually use a real language like Objective-C.