We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article Steps. Related Articles. Author Info Last Updated: January 20, Create a Java project. I will call my project "Tip Calculator.
Highlight the folder you have just created. This time, pick "Class. For this class, we can simply use the default settings. Click finish and Eclipse will open a new Java class in the program window. I called my class "Calculator. Eclipse automatically creates a class in the program window.
My class uses a method called calculate tip to calculate the tip on a restaurant check. For those who are interested, I have included the code in the image to the right. Each line is explained using line comments. It is time to create our main method. Give your main class a name and click finish. I will call mine CalculatorTest. Eclipse now opens a new tab with your main class.
We can now write the main method that calls the method calculateTip from the Calculator class. It then passes this information to the Calculator class and gets the calculation. Then the program displays the total. Once again, click on the image to the right to see the code I used. Click the "run" button which looks like a "play" icon that is located just above your program window. This action will automatically save and compile your code. Your program will run in the console window just below the program window.
Check to see if your program works correctly. Eclipse includes an excellent debug feature. I have changed my code so it now has a few mistakes. First, we will add a break point by double clicking the left margin of the line where we expect to encounter problems.
You can see the break point at line 9. Now click the "debug" icon at the top of the window, right beside the "run" button. It looks like a bug. Debugging mode will open some new windows that show you exactly what is happening when your program runs.
The program will stop at the break point that you have set up. As you "step" through your program, you can "mouse" over your variables in your program window to see what values they contain during each step.
Alternatively, you can open the variable window located at the top right of Eclipse. The main method is executed by the JVM, so it doesn't require creating an object to invoke the main method. So, it saves memory. It means it doesn't return any value. String[] args or String args[] is used for command line argument. We will discuss it in coming section. Here, System is a class, out is an object of the PrintStream class, println is a method of the PrintStream class.
We will discuss the internal working of System. As displayed in the above diagram, write the simple program of Java in notepad and saved it as Simple. When we have done with all the steps properly, it shows the following output:. Write here:. There are many ways to write a Java program. The modifications that can be done in a Java program are given below:. Let's see the simple code of using var-args in the main method.
We will learn about var-args later in the Java New Features chapter. If there occurs a problem like displayed in the below figure, you need to set a path. Since DOS doesn't recognize javac and java as internal or external command.
To overcome this problem, we need to set a path. However, it is an excellent approach to set the path. Click here for How to set path in java. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services.
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