Java | Class and Object | Question 2

Predict the output of following Java program

class Test { 
  int i; 
}  
class Main { 
  public static void main(String args[]) {  
      Test t = new Test();  
      System.out.println(t.i); 
   }  
} 

(A) garbage value
(B) 0
(C) compiler error
(D) runtime error

Answer: (B)

Explanation: In Java, fields of classes and objects that do not have an explicit initializer and elements of arrays are automatically initialized with the default value for their type (false for boolean, 0 for all numerical types, null for all reference types). Local variables in Java must be definitely assigned to before they are accessed, or it is a compile error.

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