A noteworthy issue in java-difference between class member initialization and variable Initialization

1. code1

Class Change {int x;} public class JavaTest1 {public static void main (String [] agrs) {Change c = new Change (); System. out. println ("The value of c is" + c. x );}}

2. code2

Public class JavaTest1 {public static void main (String [] agrs) {int a; System. out. println ("The value of c is" + );}}

3. Analysis

Results In 1 are completely different from those in 2. Class Members in 1 are initialized to 0 when using the new function, although they are not displayed and initialized through objects, in 2, variable a is only a reference to an integer variable, so an error is reported.