【Java2】包/类，运算符，if/switch，for/while

发布日期：2021-04-30 21:04:43 浏览次数：123 分类：精选文章

本文共 1502 字，大约阅读时间需要 5 分钟。

Java????????

1. ????

????Java???????????????

??IDE?IntelliJ IDEA????File > New Project?

??Empty Project???????

????????????????8???????java: invalid version 9????

???????????????????

2. ??????

2.1 ?????

Java?????????&&??????||??????

&&????????????false?????????????

||????????????true?????????????

2.2 ?????

????????????????????

?? ? ??1 : ??2

?????

?????????????

int a = 10, b = 20;int max = a > b ? a : b; // max = 20

??????????????

int weightOne = 180, weightTwo = 200;boolean flag = weightOne == weightTwo; // flag = false

?????????????

int heightOne = 150, heightTwo = 210, heightThree = 165;int temp = heightOne > heightTwo ? heightOne : heightTwo; // temp = 210int max = temp > heightThree ? temp : heightThree; // max = 210

3. ?????Scanner??

3.1 ?????

???????import java.util.Scanner;?

??Scanner??????????

Scanner scanner = new Scanner(System.in);int number = scanner.nextInt();System.out.println(number);

4. ?????if/switch?

4.1 ?break??

?if?switch????????case??break?????????case?

switch (??) {    case 1:        // ??        break;    case 2:        // ??        break;    default:        // ??}

4.2 ????

?????????case??break????????case?

???????????case??????default?

5. ?????for/while/do.while?

5.1 for??

??????????

for (???; ??; ??) {    // ??}

5.2 while??

??????????

while (??) {    // ??}

5.3 do.while??

do.while?????????????

do {    // ??} while (??);

6. ???????

???????Ctrl + Alt + Enter??????

?????????Alt + ???????????

????????Ctrl + Alt + L??????

???Java????????????????????????????

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