static&&no

public class B {
private int id;
private static int nextId=1;
public static void main(String[] args) {
// TODO Auto-generated method stub
B b=new B();
b.id =B.nextId;
System.out.println("b.id="+b.id+"\t\tB.nextId="+B.nextId);
B.nextId++;
System.out.println("b.id="+b.id+"\t\tB.nextId="+B.nextId);
}
}

结果：
b.id=1 B.nextId=1
b.id=1 B.nextId=2