java经典案例（1）

package dictation;

import java.util.Scanner;

public class test2 {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入年份:");
        
        int year = scanner.nextInt();
        /*
         * 判断逻辑
         * 如果年份能被4整除并且不能被100整除，或能被400整除的数为闰年
         */
        if((year%4 == 0&&year%100 != 0)||year%400 == 0) {
            System.out.println(year+"是闰年");
        }else {
            System.out.println(year+"不是闰年");
        }
        
        
    }

}

 1 package demo;
 2 
 3 import java.util.Scanner;
 4 
 5 public class demo01 {
 6 
 7     public static void main(String[] args) {
 8         Scanner scanner = new Scanner(System.in);
 9         
10         System.out.println("请输入两个整数：");
11         //比较两个数的大小
12         int a = scanner.nextInt();
13         
14         int b = scanner.nextInt();
15         
16         int max;
17         
18         if(a>=b) {
19             max = a;
20         }else {
21             max = b;
22         }
23         
24         System.out.println("最大值为"+max);
25         
26     }
27 
28 }

package demo;

    class Box{
        double width;
        double height;
        double depth;
    
    
        void volume() {
            System.out.print("Volume is");
            System.out.println(width*height*depth);
        }
    }
public class demo1 {
    public static void main(String args[]) {
        Box box1 = new Box();
        Box box2 = new Box();
        
        double volume1;
        double volume2;
        
        box1.depth=1;
        box1.width=2;
        box1.height=3;
        
        box2.depth=1;
        box2.width=2;
        box2.height=3;
        
        //调用方法
        box1.volume();
        box2.volume();
        
    }
}

package demo;

    class Box{
        double width;
        double height;
        double depth;
    
    
        double volume() {
        //返回值返回给调用它的box1.box2对象，将数值赋给volume1，volume2
        return width*height*depth;
        }
    }
public class demo1 {
    public static void main(String args[]) {
        Box box1 = new Box();
        Box box2 = new Box();
        
        double volume1;
        double volume2;
        
        box1.depth=1;
        box1.width=2;
        box1.height=3;
        
        box2.depth=1;
        box2.width=3;
        box2.height=3;
        
        //调用方法
        volume1=box1.volume();
        System.out.println("voulme is"+volume1);
        volume2=box2.volume();
        System.out.println("voulme is"+volume2);
        
    }
}