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Java Tutorial » Class Definition » Defining Class  
5.1.4.Creating Objects of a ClassPrevious/Next
class Sphere {
  double radius; // Radius of a sphere

  Sphere() {

  }

  // Class constructor
  Sphere(double theRadius) {
    radius = theRadius; // Set the radius

  }

}

public class MainClass {
  public static void main(String[] arg){
    Sphere sp = new Sphere();
    
  }

}
5.1.Defining Class
5.1.1. What Is a Java Class?
5.1.2. Fields
5.1.3. Defining Classes: A class has fields and methods
5.1.4. Creating Objects of a Class
5.1.5. Checking whether the object referenced was of type String
5.1.6. Class declaration with one method
5.1.7. Class declaration with a method that has a parameter
5.1.8. Class that contains a String instance variable and methods to set and get its value
5.1.9. Class with a constructor to initialize instance variables
5.1.10. Specifying initial values in a class definition