Java if .... else 练习题

文章说明*

本篇文章介绍如何使用【if else 练习 】，仅是对自己学习的记录，并没有深入分析每个模块。感谢支持！

例题一
/*需求：
* 为 100 给BMW
* 为 80,90 给x
* 为 60，80 给 ipad
* 其他的，什么都没有
* 键盘输入成绩哦…
* */
//针对于条件表达式：
// 如果多个条件表达式之前是“互斥”关系(没有公共的部分) ，那个判断和执行语句声明在上面和下面，都无所谓。
//如果多个条件表达式之前有公共的部分，那么需要根据实际情况，考虑清楚！应该将那个结构放在上面。
//如果多个条件表达式之前有包含的关系，那么需要根据实际情况，考虑清楚！应该将那个结构放在上面。(通常小的范围在上面)

        Scanner scanner = new Scanner(System.in);
        double intPut = scanner.nextDouble();
        if (intPut < 0 || intPut > 100) {
            System.out.println("请重新输入！");
        } else {
            if (intPut == 100) {
                System.out.println("BMW");
            } else if (intPut > 80 && intPut <= 99) {
                System.out.println("X");
            } else if (intPut >= 60 && intPut <= 80) {
                System.out.println("ipad");
            } else {
                System.out.println("加油！");
            }

        }

例题二：

//输入三个数，进行从 小 到 大的排序

第一种方法

        //输入三个数，进行从 小  到  大的排序
        Scanner scanner1 = new Scanner(System.in);
        System.out.println("请输入三个数：");
        int intPut1 = scanner1.nextInt();
        int intPut2 = scanner1.nextInt();
        int intPut3 = scanner1.nextInt();
        //第二种
        if (intPut1 > intPut2) {
            if (intPut3 > intPut1) {
                System.out.println(intPut2 + "," + intPut1 + "," + intPut3);
            }
            if (intPut3 > intPut2) {
                System.out.println(intPut2 + "," + intPut3 + "," + intPut1);
            } else {
                System.out.println(intPut3 + "," + intPut2 + "," + intPut1);
            }
        } else {
            if (intPut3 > intPut2) {
                System.out.println(intPut1 + "," + intPut2 + "," + intPut3);
            }
            if (intPut3 > intPut1) {
                System.out.println(intPut1 + "," + intPut3 + "," + intPut2);
            } else {
                System.out.println(intPut3 + "," + intPut1 + "," + intPut2);
            }

        }







         // 第一种 从大到小 排序：
        if (intPut1 > intPut2 && intPut1 > intPut3) {
            if (intPut2 > intPut3) {
                System.out.println(intPut1 + "," + intPut2 + "," + intPut3);
            } else {
                System.out.println(intPut1 + "," + intPut3 + "," + intPut2);
            }
        } else if (intPut2 > intPut1 && intPut2 > intPut3) {
            if (intPut1 > intPut3) {
                System.out.println(intPut2 + "," + intPut1 + "," + intPut3);
            } else {
                System.out.println(intPut2 + "," + intPut3 + "," + intPut1);
            }
        } else {
            if (intPut1 > intPut2) {
                System.out.println(intPut3 + "," + intPut1 + "," + intPut2);
            } else {
                System.out.println(intPut3 + "," + intPut2 + "," + intPut1);
            }
        }

第二种方法：

        //输入三个数，进行从 小  到  大的排序
        Scanner scanner1 = new Scanner(System.in);
        System.out.println("请输入三个数：");
        int intPut1 = scanner1.nextInt();
        int intPut2 = scanner1.nextInt();
        int intPut3 = scanner1.nextInt();
        //第三种：
        int max = intPut1;
        if (intPut2 > intPut1 && intPut2 > intPut3) {
            max = intPut2;
        }
        if (intPut3 > intPut1 && intPut3 > intPut2) {
            max = intPut3;
        }

        int min = intPut1;
        if (intPut2 < intPut1 && intPut2 < intPut3) {
            min = intPut2;
        }
        if (intPut3 < intPut1 && intPut3 < intPut2) {
            min = intPut3;
        }
        int sum = (intPut1 + intPut2 + intPut3) - (max + min);
        System.out.println(min + "," + sum + "," + max);