Question: What is the output of this Java program? class Test { int i=0; } class Main { public static void main(String args[]) { Test t;

What is the output of this Java program? class Test { int i=0; } class Main { public static void main(String args[]) { Test t; System.out.println(t.i); } } Answer Error

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class T { int t = 20; T() { t = 40; } } class Main { public static void main(String args[]) { T t1 = new T(); System.out.println(t1.t); } } Answer 40

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I need explanation >>why we get an error in the first one? and why we get ( 40) not (20) in the second one

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