Which class is super class of all classes

Question

I am a Java beginner. I am little bit confused as to which is the Super class of all classes in Java?

Answer 1

From the Object documentation:

The root class of the Java class hierarchy. All non-primitive types (including arrays) inherit either directly or indirectly from this class.

Answer 2

I believe it's java.lang.Object

Answer 3

java.lang.Object class is the super class for all java classes. you can see with following example:

   class test
   {
    public static void main(String a[]){
     System.out.println("hi this java");
    }
   }

save program with- test.java compile program using - javac test.java

now type following cmd to see real output ; javap test

• output--

  class test extends java.lang.Object{
   test();
   public static void main(java.lang.String[]);
  }
  

the first line itself tells that by default it extends java.lang.Object.

Answer 4

java.lang.Object is a super class of any class by default.
Also Object class is a superclass for all interfaces by default, Ex

public interface ICommand
{

}

class Test {
   ICommand c;
   Object o = c;  //works fine
}