/* final class A
{
    public final void eat(){
        System.out.println("測試");
    }
} */

class A
{

}
class B extends A
{
    //測試
    public void eat(){
        System.out.println("不能重寫父類的方法");
    }

    static final double PI=3.1415926;

    public void test( final int x,int y){
        //x=12;  這里是不能改變的
        y=33;
        System.out.println("x="+x+"y="+y);
    }
    public void test( final int[] x){
        //表示傳過來的數組的地址  可以改變里面的值
        x[0]=1;
        //這里也是錯誤的?。?！x=new int[]{23};
        System.out.println(x[1]);
    }
}
class Demo4
{
    public static void main(String[] args)
    {
        new B().test(2,3);
        new B().test(new int[]{20,3});

        A a =new A();
        B b=new B();
        System.out.println("a 是否是B的對象（實例） ");
        System.out.println("instanceof "+(a instanceof A));
        System.out.println("instanceof "+(a instanceof B));
        System.out.println("instanceof "+(b instanceof B));
        System.out.println("instanceof "+(b instanceof A));
        System.out.println("final");
    }

}