why this is not working(subclass to superclass).

[Ritesh raushan]

at compile time gives error.but i think that Object is a super class he takes all sub class object .

error-
method set in class Manager cannot be applied to given types;
m.set("ritesh");
^
required: Object
found: String
reason: actual argument String cannot be converted to Object by method invocation conve
rsion

class Manager 
{ 
	private Object object;
   public void set(Object object)
		{ 
		this.object = object;
		}
    public Object get()
		{ 
		return object; 
		}
     public static void main(String[] arg)
		{
			Manager m=new Manager();
			m.set("ritesh");
	    }
}

[Matthew Brown]

The most likely explanation is you actually have your own Object class hanging around somewhere in the same package (either as source code or a compiled code). If you can't find it, try changing all the references to java.lang.Object and see if that changes the result.