程序代码：

 class A {
    int a;
    static int b;
   
    void setab(int i) {
        a = i;
        b = i+1;
    }
   
    int getab() {
        return a;
    }
   
    static void setb(int i) {
        b += i;
    }
   
    static int getb() {
        return b;
    }
} 

public class Exam3_7 {
    public static void main(String args[]) {
        A x = new A();
        A y = new A();
        x.setab(5);
        y.setab(10);
        System.out.println("x.a="+x.getab()+",y.a="+y.getab());
        x.setb(-5);
        y.setb(-10);
        System.out.println("x.b="+x.getb()+",y.b="+y.getb());
    }
}