class HasStatic{

    private static int x=100；

    public static void main(String[ ] args){

        HasStatic hs1=new HasStatic( );

        hs1.x++;

        HasStatic hs2=new HasStatic( );

        hs2.x++;

        hs1=new HasStatic( );

        hs1.x++;

        HasStatic.x--;

        System.out.println("x="+x);

    }

}

public class Test1{

    public float aMethod（float a，float b）{ }

}

A a0 =new A();

A a1 =new B();

A a2 =new C();