Simple program(but cofusion with output)

[Shiva Mohan]

   
public class Objective14 { 
   String s; 
   public void Objective14(){ 
      s = "Constructor"; 
   } 
   public void printString() { 
      System.out.println(�s=�+s); 
   } 
   public static void main(String args[]) { 
      Objective14 o = new Objective14(); 
      o.printString(); 
   } 
}  
 

Why s=null is printing without printing s=Constructor.Please help me.

[Tim McGuire]

the method objective14 is never called. You might think it is a constructor,
but a constructor would be

public objective14(){
....
}

[Cameron Wallace McKenzie]

Returning void on a constructor makes the constructor not a constructor. Instead, you had a method with the same name as the constructor, which is immensely confusing. To be honest, I didn't think it would compile like that, but it does. IRAD does indeed give a warning.

The code below has the void removed. This will give you the results you expect.

Regards,

-Cameron McKenzie


public class Objective14 {
String s;

/*Constructor does NOT have a return type*/
public Objective14(){
s = "Constructor";
}
public void printString() {
System.out.println("s="+s);
}
public static void main(String args[]) {
Objective14 o = new Objective14();
o.printString();
}
}

[Shiva Mohan]

Thanks.I got it.

[Srinivas Kalvala]

Originally posted by Shiva Mohan:

   
public class Objective14 { 
   String s; 
   public void Objective14(){ 
      s = "Constructor"; 
   } 
   public void printString() { 
      System.out.println(�s=�+s); 
   } 
   public static void main(String args[]) { 
      Objective14 o = new Objective14(); 
      o.printString(); 
   } 
}  
 

Why s=null is printing without printing s=Constructor.Please help me.

Java will provide default constructor , if you don't provide one. That is what happening in your case. There is no constructor. So the "s" will be null even after default constructor has been called.

: remove void ( return type in your method , it will act as constructor).

Thank you.

[vijaya bharath]

There is no return type for constructor , even it doesn't allow void,when you declare it void it assumes it as normal method not as a constructor.It will be get called only when you call explicitly using the object created.