Class Object : Class Object « Class Definition « Java Tutorial

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Java Tutorial » Class Definition » Class Object 
5. 17. 3. Class Object
  1. All the classes defined are subclasses by default.
  2. Object is a superclass of every class.
  3. The inheritance happens automatically.
  4. Your classes will inherit members from the class Object.
MethodPurpose
toString()returns a string describing the current object
equals()compares two objects
getClass()returns a Class that identifies the class of the current object.
hashCode()calculates a hashcode for an object
notify()wakes up a thread associated with the current object.
notifyAll()wakes up all threads associated with the current object.
wait()causes a thread to wait


class Dog{
  public Dog(String aType){
  }
}
public class MainClass{
  public static void main(String[] a){
    Dog d = new Dog("a");
    Class objectType = d.getClass();             
    System.out.println(objectType.getName());      
  }
}
Dog
5. 17. Class Object
5. 17. 1. Getting java.lang.Class: Information about your object
5. 17. 2. Comparing Objects
5. 17. 3. Class Object
5. 17. 4. Storing a reference to the String object as type Object
5. 17. 5. The 'Class' class also brings the possibility of creating an object without using the new keyword.
5. 17. 6. Assignment with objects is a bit tricky.
5. 17. 7. Demonstrate Run-Time Type Information.
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