Creating and Compiling a Java Class

To create and compile a Java class, use a text editor and the JDK javac tool.

  To create a Java class for a custom-defined function:

  1. In a text editor, create a Java class.

    For example:

    public class CalcFunc {
      public static double sum (double[] data) {
        int i, n = data.length;
        double sum = 0.0d;
        for (i=0; i<n; i++) {
          double d = data [i];
          sum = sum + d;
        }
        return sum;
      }
    }
    
  2. Save the file with a .java extension.

    For example:

    CalcFunc.java
  3. Navigate to the directory where the .java file resides; at a command prompt, enter this command:

    javac java_filename

    For example:

    javac CalcFunc.java
  4. Resolve any compiling errors until the compiler creates a new file with a .class extension.

    For example:

    CalcFunc.class