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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