【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

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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
    1. ??????????????
    2. int weightOne = 180, weightTwo = 200;boolean flag = weightOne == weightTwo; // flag = false
      1. ?????????????
      2. 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 ?????

      3. ???????import java.util.Scanner;?
      4. ??Scanner??????????
      5. 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. ???????

      6. ???????Ctrl + Alt + Enter??????
      7. ?????????Alt + ???????????
      8. ????????Ctrl + Alt + L??????
      9. ???Java????????????????????????????

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    [***.144.177.141]2026年06月11日 17时17分49秒