3.1 FontsĪn instance of the Font class represents a specific font to the system. Finally, the SystemColor class (which is new to Java 1.1) provides access to the desktop color scheme. Next, the Color class is used to represent colors and can be used to specify the background color of any object, as well as the foreground color used to display a text string or a shape. The FontMetrics class gives you detailed information about a font, which you can use to position text strings intelligently. First, we discuss the Font class, which determines the font used to display text strings, whether they are drawn directly on the screen (with drawString()) or displayed within a component like a text field. If you get an error about java being missing, follow the JDK installation instructions, and try again.This chapter introduces the java.awt classes that are used to work with different fonts and colors. ~/jgrasp, ~/opt/jgrasp, or /usr/local/jgrasp would all be reasonable locations, but anything will do.Ĭd into that directory and run java -jar jgrasp.jar. zip file you just downloaded to some permanent location. Make sure you followed the JDK installation instructions, and try again. If jGRASP opens successfully, then you're all set! One way to do this is to press Cmd+Space, type "jGRASP", and press Enter: You can now run jGRASP by opening jGRASP.app from the Applications folder. pkg file and choose "open".Īnd you can complete the installation by repeatedly clicking "Continue". To run the jGRASP installer regardless, bypassing this "feature", right click the. This is due to a macOS "feature" that makes it difficult to run applications not distributed via Apple's official channels. You may receive an error about jGRASP being from an "unidentified developer": One potential reason for windows user could be - you forgot to setup the JAVA_HOME environment variable after installing JDK. Then your system does not yet have the JDK installed. If you see this, you're all set! However, if you get the following error: The default settings are reasonable for most users,Īnd you can complete the installation by repeatedly clicking "Next".Īt this point, you will have a new jGRASP shortcut on your desktop. Save the file to your desktop or another convenient location. Locate the appropriate download link and click it: We recommend installing the lastest stable, non-beta version of the jGRASP editor.Īt the time of writing, this was version jGRASP 2.0.6_10 (August 10, 2022) as of Aug 20, 2023. This page contains an optional survey by the jGRASP authors you may scroll down and skip it. We recommend you to JGrasp for this course. Second you will need to install an Integrated Development Envionment (IDE), which is just like an editor. Hence, in order to write, compile and exceute a java program-Ģ. This figure shows how the JDK fits into the Java application development lifecycle. The distinction is that the JDK is a package of tools for developing Java-based software, whereas the JRE is a package of tools for running Java code. The JDK allows developers to create Java programs that can be executed and run by the JVM and JRE.ĭevelopers new to Java often confuse the Java Development Kit and the Java Runtime Environment. The JRE is the on-disk part of Java that creates the JVM. The JVM is the Java platform component that executes programs. It's important to differentiate between these three technologies, as well as understanding how they're connected. The Java Development Kit (JDK) is one of three core technology packages used in Java programming, along with the JVM (Java Virtual Machine) and the JRE (Java Runtime Environment). Installing jGrasp Understanding JDK and IDE
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