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public class Parent
{
    //1
    static int a =  1;
    //2
    static
    {
        a = 10;
        System.out.println("parent static code");
    }
    //4
    public Parent()
    {
        System.out.println("Parent constructor");
        System.out.println("Parent a=" + a);
    }
    public static void main(String[] args)
    {
        System.out.println("***************");
        Parent c = new Child();
    }
}
class Child extends Parent
{
    static int a = 2;
    //3
    static
    {
        a = 20;
        System.out.println("child static code");
    }
    //5
    public Child()
    {
        System.out.println("Child constructor");
        System.out.println("Child var a=" + a);
    }
}
Ö´Ðнá¹û£º
run:
parent static code
***************
child static code
Parent constructor
Parent a=10
Child constructor
Child var a=20
BUILD SUCCESSFUL (total time: 0 seconds)
Java
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* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 
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