类、方法、对象的定义与使用示例

import java.util.Scanner;
class Season{ //创建季节类
//定义四个季节并赋值
public String spring = "春季";
public String summer = "夏季";
public String autumn = "秋季";
public String winter = "冬季";
public String error = "输入的月份有误！";
//季节判断，带返回值的方法
public String judge(int month){
if(month>0 && month<4)
return spring;
else if(month>3 && month<7)
return summer;
else if(month>6 && month<10)
return autumn;
else if(month>9 && month<13)
return winter;
else
return error;
}
}
public class TestSeason{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.println("请输入月份（1-12）：");
int month = input.nextInt();
Season test = new Season(); //创建Season()对象test
System.out.println(month+"月是"+test.judge(month));
}
}
/*---------------------
请输入月份（1-12）：
3
3月是春季
---------------------*/