Java static关键字的小练习

package com.bytezreo.statictest;

/**
 * 
 * @Description static 关键字的使用 小练习
 * @author Bytezero·zhenglei!        Email:420498246@qq.com
 * @version
 * @date 下午12:51:45
 * @
 *
 */
public class CircleTest 
{
    public static void main(String[] args) 
    {
        Circle c1 = new Circle();
        
        Circle c2 = new Circle();
        
        Circle c3 = new Circle();
        System.out.println("c1的id:"+c1.getId());
        System.out.println("c2的id:"+c2.getId());
        System.out.println("c3的id:"+c3.getId());
        
        System.out.println("创建圆的个数为："+Circle.getTotal());
        
        
    }
}

class Circle
{
    private double radius;
    private int id;     //自动赋值
    
    //构造器
    public Circle()
    {
        id = init++;
        total++;
    }
    
    public Circle(double radius)
    {
        this();
//        id = init++;        //自动累加id
//        total++;
        
        this.radius = radius;
        
    }
    
    

    private static int total;   //记录创建圆的个数
    private static int init = 1001;     //静态 多个对象共享
    
    public double findArea()
    {
        return 3.14 * radius * radius;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public int getId() {
        return id;
    }

    public static int getTotal() {
        return total;
    }



    
    
    
    
}