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学习视频:https://www.bilibili.com/video/BV17J411G72L?p=20
【1-19】
- /*
- 练习1:打印个人信息
- */
- //System.out.println()分行显示 System.out.print()一行显示
- class TestExer1{
- public static void main(String[] args) {
- System.out.println("小明");
- System.out.println(18);
- System.out.println('女');
- System.out.println(true);
- System.out.println(40.2);
- System.out.println("-------------------");
- System.out.print("fdfd");
- System.out.print('!');
- }
- }
- //变量
- class TestVariable{
- public static void main(String[] args) {
- int age = 10;
- System.out.print(age);
- }
- }
- class DefineAndUseVariable{
- public static void main(String[] args) {
- int age;
- age = 18;
- int age2 = 18;
- System.out.println(age);
- }
- }
- //int double String char boolean
- class TestExer2{
- public static void main(String[] args) {
- String name = "dfd";
- int age = 34;
- char gender = '女';
- double height = 152.2;
- boolean marray = false;
- System.out.println(name);
- System.out.println("性别:" + gender);
- System.out.println(height);
- System.out.println(marray);
- }
- }
- /*
- 基本数据类型
- 1.整型 byte(-128 127) short(-32768 32767) int long
- 2.小数 float double
- 3.字符 char
- 4.字符串 String
- 5.布尔 boolean
- long需要加L 或 l float需要加f 或 F
- */
- class TestType{
- public static void main(String[] args) {
- boolean marry = false;
- if(marry) {
- System.out.println("已婚");
- }else {
- System.out.println("未婚");
- }
- long time = 3223444444222L;
- System.out.println(time);
- float f = 34.35f;
- System.out.println(f);
- }
- }
- //字符常量可以用来表示转义字符'\n'(换行)'、'\t'(tab) '\b'(删除键)'\\' '"' '\r'(回车键)
- //还可以表示'\u字符的unicode编值的十六位进制形式'
- class TestExer3{
- public static void main(String[] args) {
- String bookName = "fdfd";
- String author = "dfdf";
- double price = 100.1;
- int sale = 1;
- int amout = 100;
- boolean cu = false;
- System.out.println("书名:" + bookName);
- }
- }
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