You should have already installed Java Development Kit (JDK) and written a "Hello-world" program. You should see a console window appear with the following message: Hello, world Press any key to continue. From the Tools menu, choose Run Java Application. If there are no problems, then TextPad automatically returns to the program page.
A command window opens, in which the program runs. After you compile a Java program with no errors, you can run it by choosing Tools Run Java Application or pressing Ctrl+2. Programming Text EditorRunning a Java Program.
Java SE installs both JDK and JRE. Install a programming text editor, which does syntax color highlighting. Figure 3-4: Running a program.Do NOT use Notepad (Windows) or TextEdit (macOS) for programming.
Filename and classname are case-sensitive.Public class Hello. The filename shall be the same as the classname - in this case " Hello". A Java source file should be saved with a file extension of ". Do not enter the line numbers (on the left pane), which were added to aid in the explanation.Save the source file as " Hello.java". For macOS: Sublime Text, Atom, jEdit, gEdit.Getting Started - Your First Java ProgramLet us revisit the "Hello-world" program that prints a message " Hello, world!" to the display console.Step 1: Write the Source Code: Enter the following source codes, which defines a class called " Hello", using a programming text editor. For Windows: Sublime Text, Atom, NotePad++, TextPad.
Choose a meaningful " Classname" that reflects the purpose of your program, and write your programming statements inside the body of the main() method. Java Program TemplateYou can use the following template to write your Java programs. The filename, which is the same as the class name, is also case-sensitive.
I will explain them in due course.
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