Why output is coming 0

[K Amit Gupta]

Hi,
I am getting 0 when executing below mention programme- someone can explain me why its coming 0

public class AQuestion 
    { 
         private int i = giveMeJ(); 
         private int j = 10; 
         private int giveMeJ() 
         { 
              return j; 
         } 
         public static void main(String args[]) 
         { 
              System.out.println((new AQuestion()).i); 
         } 
    } 

[Edit - added code tags - MB]

[K Amit Gupta]

I have one more question....


why below programe calling String version of method

 class AQuestion 
{ 
 public void method(Object o) 
 { 
         System.out.println("Object Version"); 
  } 
 public void method(String s) 
 { 
    System.out.println("String Version"); 
 }

 public static void main(String args[]) 
 { 
     AQuestion question = new AQuestion(); 
     question.method(null); 
 }
}

[Astha Sharma]

At the time if class loading i and j both will be initialized by 0. After that assignment is done, thus 0 is returned by the method and assigned to i and 10 is assigned to j.

[Astha Sharma]

null can be assigned in a reference of String type. so string version will be called since String is subclass ob Object. If string version is not written in this program, then in that case its superclass i.e. Object version will be called.

[Harsha Smith]

You need to change the order of the lines of code to get the output 10. First you need to declare j and then i.

[Harsha Smith]

second answer:

Methods that accept objects of the subclass are given first preference. Need proof? check the following code

class AQuestion   
{   
 public void method(Number o)   
 {   
         System.out.println("Number Version");   
  }   
  
  public void method(Integer t){
	  System.out.println("Integer Version");
  }
 public static void main(String args[])   
 {   
     AQuestion question = new AQuestion();   
     question.method(null);   
 }  
} 

If more than one matching method is found, the code won't compile. check this

class AQuestion   
{   
 public void method(Number o)   
 {   
         System.out.println("Number Version");   
  }   
  
  public void method(Integer t){
	  System.out.println("Integer Version");
  }
  public void method(String s){
	  System.out.println("String Version");
  }
 public static void main(String args[])   
 {   
     AQuestion question = new AQuestion();   
     question.method(null);   
 }  
}