usestatic.java

清华大学第二版

class Count{
	int serialNumber;
	static int counter =0;	//类变量
	public Count(){
		counter++;
		serialNumber = counter;
	}
}
public class UseStatic{
	public static void main(String args[]){
		System.out.println("Count.counter is "+Count.counter);
		Count Tom = new Count();
		Count John = new Count();
		System.out.println("Tom's serialNumber is "+Tom.serialNumber);
		System.out.println("John's serialNumber is "+John.serialNumber);
		System.out.println("Now Count.counter is " + Count.counter);
	}
}