第二章 JSP开发基础

## 1. Java基本程序设计

### 1.1 变量、常量与数据类型

package phonejudge;
public class ControlFlowExample {

    public static void main(String[] args) {

        int score = 85;

        if (score >= 90) {

            System.out.println("优秀");

        } else if (score >= 75) {

            System.out.println("良好");

        } else {

            System.out.println("继续努力");

        }

        int day = 6;

        switch(day) {

            case 1: System.out.println("星期一"); break;

            case 2: System.out.println("星期二"); break;

            case 3: System.out.println("星期三"); break;
            case 4: System.out.println("星期四"); break;
            case 5: System.out.println("星期五"); break;
            case 6: System.out.println("星期六"); break;
            case 7: System.out.println("星期七"); break;
            default: System.out.println("周末");

        }

        int sum = 0;

        for(int i=1; i<=100; i++) {

            sum += i;

        }

        System.out.println("1-100累加和：" + sum);

        int input = 0;

        java.util.Scanner scanner = new java.util.Scanner(System.in);

        while(input < 1 || input > 10) {

            System.out.print("请输入1-10之间的数字：");

            input = scanner.nextInt();

        }

        System.out.println("您输入的是：" + input);

        int factorial = 1, n = 5;

        int i = 1;

        do {

            factorial *= i;

            i++;

        } while(i <= n);

        System.out.println(n + "! = " + factorial);

    }

}