Writing your First Java Program in Eclipse

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  1. Launch Eclipse
    • Launch Eclipse by running "eclipse.exe" from the Eclipse installed directory.
    • Choose an appropriate directory for your workspace, i.e., where you would like to save your files (e.g., d:\myproject\eclipse for Windows).
    • If the "Welcome" screen shows up, close it by clicking the "cross" button next to the "Welcome" title.
  2. Create a new Java Project
    1. Choose "File" menu ⇒ "New" ⇒ "Java project".
    2. The "New Java Project" dialog pops up.
        • In "Project name", enter "FirstProject".
        • Check "Use default location".
        • In "JRE", select "Use default JRE (currently 'JDK1.8.xx')". But make sure that your JDK is 1.5 and above.
        • In "Project Layout", check "Use project folder as root for sources and class files"
          Push "Finish" button.
  3. Write a Hello-world Java Program
    1. In the "Package Explorer" (left pane) ⇒ Right-click on "FirstProject" (or use the "File" menu) ⇒ New ⇒ Class.
    2. The "New Java Class" dialog pops up.
      • In "Source folder", keep the "FirstProject"
      • In "Package", delete the content if it is not empty
      • In "Name", enter "Hello"
      • Check "public static void main(String[] args)"
      • Don't change the rest.
    3. Push "Finish" button.
    4. The source file "Hello.java" opens on the editor panel (the center pane). Enter the following codes:
      1. public class Hello {
   public static void main(String[] args) {
      System.out.println("Hello, world!");
   }
}
  4. Compile & Execute the Java Program
    • To run the program, right-click anywhere on the source file "Hello.java" (or choose "Run" menu) ⇒ Run As ⇒ Java Application.
    • The output "Hello, world!" appears on the Console panel (the bottom pane).

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