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学习视频:https://www.bilibili.com/video/BV17J411G72L?p=20
40 - 58
- class test1{
- public static void main(String[] args) {
- java.util.Scanner input = new java.util.Scanner(System.in);
- System.out.print("请输入年龄:");
- /*
- * (1)java.util.Scanner 是一个扫描仪的类型,是引用数据类型,首字母是大写,其中java。util是包
- * (2)input是变量名
- * (3)new java。util。Scanner(System。in)括号里是指接受键盘输入的值
- */
- int age = input.nextInt();//从扫描仪中获取一个int值,赋值给age这个变量
- System.out.println("age = " + age);
-
- System.out.print("请输入姓名:");
- String name = input.next();
-
- System.out.print("请输入体重:");
- double weight = input.nextDouble();
-
- System.out.print("请输入是否漂亮:");
- boolean beautiful = input.nextBoolean();
-
- System.out.print("请输入性别:");
- char gender = input.next().charAt(0);
-
- System.out.println(name + weight + beautiful + gender);
- }
- }
- class test2{
- public static void main(String[] args) {
- java.util.Scanner input = new java.util.Scanner(System.in);
- System.out.print("请输入一年份:");
- int year = input.nextInt();
- int days = 28;
- if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
- days = 29;
- }
- System.out.println(year + "的2月份的总天数有:" + days);
-
- }
- }
- class test3{
- public static void main(String[] args) {
- java.util.Scanner input = new java.util.Scanner(System.in);
- System.out.print("请输入成绩:");
- int score = input.nextInt();
-
- if(score == 100) {
- System.out.println("满分");
- }else if(score >= 90) {
- System.out.println("优秀");
-
- }else if(score >= 60) {
- System.out.println("及格");
- }else {
- System.out.println("其他");
- }
- }
- }
- class test4{
- public static void main(String[] args) {
- System.out.println(Math.random());
- //Math.random()产生的是【0, 1)的小数
-
- //得到【1, 10】
- int num = (int)(Math.random() * 10 + 1);
-
- }
- }
- //switch()中支持int short char byte数据类型 两种引用数据类型(枚举、String)
- class test5{
- public static void main(String[] args) {
- java.util.Scanner input = new java.util.Scanner(System.in);
- int week = input.nextInt();
- switch(week) {
- case 1:
- System.out.println("星期一");
- break;
- case 2:
- System.out.println("星期二");
- default:
- System.out.println("错误输入");
- }
- }
- }
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