Note: Here is an up-to-date tutorial for the new Eclipse versions Kepler and Luna: http://tuhrig.de/java-8-in-eclipse-kepler-and-luna

Since last July the new Java 7 is generally available. However, even the newer Java 8 is already available as an Early Access Preview. It can be download as part of the OpenJDK including lambda-support. To use it with Eclipse, some additional steps are required. Here’s how it goes:

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Download the JDK from http://jdk8.java.net/lambda and install it.
Create a new Java project in Eclipse.
Change some project settings in Eclipse in order to use the new javac compiler of Java 8:
1. Click right on your project and select Properties.
2. Select Builders on the left side and uncheck the default Java Builder.
3. Click on New and select Program as the type of the new builder.
4. Open javac from the JDK 8 on your disk (it’s in the folder bin).
5. Configure the new builder by providing some arguments:
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  -d${workspace_loc:/Java8}/bin
  ${workspace_loc:/Java8}/src/de/tuhrig/java8/*.java
6. Select the tab Build Options and check the During auto builds box, to let the builder run automatically.
Done! Now you can write and execute Java 8 code!

The main feature of Java 8 is the ability to write lambdas and use a functional-like programming style. This can be very useful, especially in GUI-programming. It can reduce the amount of code, because anonymous classes that only implements a listener-interface are avoided. Here’s a very simple example:

Browse to Java/jre1.8.0161/lib in the system and select jfxswt.ja rpresent in the directory. However, to set-up the appropriate environment for JavaFX application, we need to add one more JAR file so just browse to Java/jre1.8.0161/lib/ext and choose jfxrt.jar. Now, we are all ready to execute our first class file of the project.

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frame.setLayout(newFlowLayout());

JButton button2=newJButton('Click me too!');

frame.getContentPane().add(button1);

button2.addActionListener(e->{System.out.println('Bye!');});

}

Installing Java 8 and Eclipse on Mac OS X. This page tells you how to download and install Java 8 and Eclipse on Mac OS X, and how to configure Eclipse. Installing Java 8. Go to the Oracle website. You'll see something like this. A: This means Eclipse is using Java 9, which is not compatible with running your programs. To change Eclipse to use Java 8 instead, follow these steps: Open Eclipse Preferences: On Mac: in the top toolbar, go to Eclipse - Preferences. On Windows: in the top toolbar, go to Window - Preferences.

The code creates a common JFrame with two buttons. To each button an action-listener is added. But instead of implementing an anonymous class, a method reference is passed in the first case and a lambda in the second case. This reduces the amount of code compared with the old solution that looked like this:

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publicvoidactionPerformed(ActionEvente){

System.out.println('..');

});

However, the Java compiler will create exactly such a thing of the lambda expression or function reference. Therefore, the passed method must fulfill the interface described by ActionListener. Also, we can only use lambdas instead of interfaces that only describe one single method. Such interfaces are called functional interfaces.

Since Eclipse Juno is made for Java 7 it will not recognize the new lambda syntax. Hence, the editor will mark parts of the code as red errors. But it’s still possible to compile and to execute the code using the new javac compiler form Java 8.

Horrible histories vicious vikings pdf editor. Best regards,
Thomas Uhrig

Related Posts

1. Overview

In the Java ecosystem, as the new releases of JDK are introduced at least once a year, we'll probably need to switch to a newer version at some point.

In this quick tutorial, we'll show how to check the available JREs, add a JRE to Eclipse, and change a Java version in an Eclipse project, so we'll be ready when that time comes.

2. Check Whether the JRE Is Available in Eclipse

After being sure that we have installed the version that we want to use, we'll need to ensure that it's available to use in Eclipse.

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Let's take a look at Window ->Preferences, and within that, Java -> Installed JREs:

If the JRE we want is listed, then we're good to go.

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But, suppose we need to use JRE 9, 10, or 11. Since we only have JDK 8 installed, we'll have to add it to Eclipse.

3. Adding a JRE to Eclipse

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Next, from the Window ->Preferences dialog, let's click the Add… button. From here, we need to specify the JRE type. We'll choose Standard VM:

And finally, let's specify the location of the new JRE (under the JRE home) and click Finish:

As a result, we now have two JREs configured in our IDE:

4. Change the Java Version of Our Project

Now, let's suppose that we were using Java 8 in our project and now we want to change it to Java 10:

First, we'll navigate to the Project properties and then to the Java Build Path:

and hit the Remove button on the existing JRE:

Now, we'll use the Add Library button and choose the JRE System Library:

Let's choose JavaSE-10 from the JDK that we recently installed and click the Finish button:

Financial astrology vedic. Now, as we can see, we've correctly configured our project's Java Build Path:

We need to do one additional step — make sure we're using the correct Compiler Compliance Level for the Java Compiler:

In our case it says Java 10, so we're all good:

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In case the Compiler Compliance Level is not the correct one, we can simply

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