Java简单的switch使用

import java.util.Scanner;

public class SwitchDome {

	public static void main(String[] args) {
		Scanner but = new Scanner(System.in);
		System.out.println("请输入您的分数：");
		int data_but = but.nextInt();
		switch(data_but) 
		{
			case 90:
				System.out.println("优秀");
				break;
			case 80:
				System.out.println("良好");
				break;
			case 70:
				System.out.println("一般");
				break;
			case 60:
				System.out.println("及格");
				break;
			default:
				System.out.println("继续努力");
		}
	}

}