java流程控制练习案例（一）

1、判断某一年是否为闰年

代码如下（示例）：

import java.util.Scanner;

public class Demo {
    public static void main(String[] args) {   //主方法
    	Scanner scan=new Scanner(System.in);
    	System.out.println("请输入一个年份：");     //向控制台输出一个提示信息
    	long year;
    	try {
			year = scan.nextLong();
			if (year%4==0&&year%100!=0||year%400==0) {   //是闰年
				System.out.println(year+"是闰年！");
				
			}else {
				System.out.println(year+"不是闰年！");
			}
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("您输入的不是有效的年份！");
		}
    	
    }
}

2、用switch语句根据消费金额计算折扣

代码如下（示例）：

public class ProductPrice {
	public static void main(String[] args) {
		float money = 1170;     //金额
		String rebate="";     //折扣
		if(money>200) {
			int grade = (int)money/200;     //等级
			switch(grade) {      //根据等级计算折扣比例
			    case 1:
			        rebate = "九五折";
			        break;
			    case 2:
			        rebate = "九折";
			        break;
			    case 3:
			        rebate = "八五折";
			        break;
			    case 4:
     			    rebate = "八三折";
     			    break;
			    case 5:
			    	rebate = "八折";
			    	break;
			    case 6:
			    	rebate = "七八折";
			    	break;
			    case 7:
			    	rebate = "七五折";
			    	break;
			    case 8:
			    	rebate = "七三折";
			    	break;
			    case 9:
			    	rebate = "七折";
			    	break;
			    case 10:
			    	rebate = "六五折";
			    	break;
			    default:
			    	rebate = "六折";	
			}
		}
		System.out.println("您的累计消费金额为："+money);   //输出消费金额
		System.out.println("您将享受"+rebate+"优惠！");    //输出折扣比例 
	}
}