Java中switch用法

Question

import java.util.Scanner; import java.util.Scanner; public class ch35 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个百分制成绩"); int a = input.nextInt(); String chengji = ""; switch (a){ case 60: chengji = "及格"; break; case 80: chengji = "良好"; break; case 90: chengji = "优秀"; break; } System.out.print("成绩" + chengji); } }

Answer 1

switch条件做一下处理，除以10就可以少很多case语句了；正确处理代码如下：

import java.util.Scanner;
public class switch用法 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.println("请输入一个百分制成绩");
		int a = input.nextInt();
		String chengji = "";
		switch (a/10) {
		case 6:
			chengji = "及格";
			break;
		case 7:
		case 8:
			chengji = "良好";
			break;
		case 9:
		case 10:
			chengji = "优秀";
			break;
		default:
			chengji = "不及格";
			break;
		}
		System.out.print("成绩" + chengji);
	}
}