创建对象

import java.util.*;

public class CountClass {
    private static int N=0;
    CountClass(){
        N++;
    }
    public void print() {
        System.out.println("已经创建了"+N+"个对象");
    }
    
    
    public static void main(String[] args) {
        int n,i;
        CountClass  A=new CountClass();
        CountClass  B=new CountClass();
        CountClass  C=new CountClass();
        CountClass  D=new CountClass();
        D.print();
        A.print();
    }
}