使用静态字段进行实例计数

public class Main {

    private static int numInstances = 0;
    /*
    n o w j a v a . c o m - 时代Java 提 供
    */


    protected static int getCount() {

        return numInstances;

    }


    private static void addInstance() {

        numInstances++;

    }


    Main() {

        Main.addInstance();

    }


    public static void main(String[] arguments) {
    /** 
    来 自 
    nowjava
    **/

        System.out.println("Starting with " +

            Main.getCount() + " objects");

        for (int  i = 0; i < 500; ++i)