Java static关键字

public class Cat {
    private static int sid = 0;
    private String name;
    int id;
    Cat(String name) {
        this.name = name;
        id = sid++;
    }
    public void info(){
        System.out.println
               ("My name is "+name+" No."+id);
    }
    public static void main(String arg[]){

        Cat.sid = 100;
        Cat mimi = new Cat("mimi");
        mimi.sid = 2000;
        Cat pipi = new Cat("pipi");
        mimi.info();
        pipi.info();
    }
}

课件： static 关键字.pdf