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); } } |
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(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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