Question

所以我有这个代码我正在为我的AP计算机科学课做准备，当我编译时我遇到了很多错误，即使我看了它，它看起来很好，一切都井然有序。所有错误都来自myClock类和RepairShop类。

public class APCS_104_Time {

public static void main(String[] args) {
        tester tester = new tester();
    }
}

    class myClock {

    private int minute;
    private int hour;

    public myClock() {
        hour = 2;
        minute = 3;
    }

    public myClock(int minute, int hour) {

        public int getHour() {
            hour = IO.getInt("Enter the hour");
            return hour;
        }

        public int getMinute() {
            minute = IO.getInt("Enter the minute");
            return minute;
        }

        public void int setMinute(int minute) {
            this.minute = minute;
        }

        public void int setHour(int hour) {
            this.hour = hour;
        }

        public String toString() {
            if (minute < 10) {
                return (hour + ":0" + minute);
            }
            else {
                return (hour + ":" + minute); 
            }
        }
    }
}

class RepairShop {

    public void int springForward(myClock time) {
        hour++;
    }

    public void int resetClock(myClock time) {
        hour = 2;
        minute = 3;
    }

    public int cloneClock(myClock time) {

        myClock copy = myClock myClock.clone();
        return myClock;
    }
}

class Tester { 

    Tester() {

        myClock time = new myClock();

        System.out.printf("The time is: " + myClock(2, 20));
    }
}

错误消息包括：

C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:38: error: illegal start of expression
        public void int setMinute(int minute) {
        ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:38: error: illegal start of expression
        public void int setMinute(int minute) {
               ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:38: error: ';' expected
        public void int setMinute(int minute) {
                   ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:38: error: '.class' expected
        public void int setMinute(int minute) {
                                      ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:38: error: ';' expected
        public void int setMinute(int minute) {
                                            ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:42: error: illegal start of expression
        public void int setHour(int hour) {
        ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:42: error: illegal start of expression
        public void int setHour(int hour) {
               ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:42: error: ';' expected
        public void int setHour(int hour) {
                   ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:42: error: '.class' expected
        public void int setHour(int hour) {
                                    ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:42: error: ';' expected
        public void int setHour(int hour) {
                                        ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:46: error: illegal start of expression
        public String toString() {
        ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:46: error: ';' expected
        public String toString() {
                              ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:58: error: <identifier> expected
    public void int springForward(myClock time) {
               ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:58: error: '(' expected
    public void int springForward(myClock time) {
                ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:58: error: invalid method declaration; return type required
    public void int springForward(myClock time) {
                    ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:62: error: <identifier> expected
    public void int resetClock(myClock time) {
               ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:62: error: '(' expected
    public void int resetClock(myClock time) {
                ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:62: error: invalid method declaration; return type required
    public void int resetClock(myClock time) {
                    ^
C:\Users\Tom\Dropbox\Auriemma, Thomas\AP Comp Sci\Unit 1\APCS_104_Time.java:69: error: ';' expected
        myClock copy = myClock myClock.clone();

Answer 1

您需要解决许多问题：

首先

//This myClock constructor can't contain other method!    
public myClock(int minute, int hour) {

            public int getHour() {
                hour = IO.getInt("Enter the hour");
                return hour;
            }

    ...
    }

第二件事是，设置者是void，不能是void和int，请从这些方法中移除int：

public void int setMinute(int minute) {
            this.minute = minute;
}

第三件事是，小时是myClock中你不能在其他课程中使用的属性：

private int hour;

第四点是你需要遵循惯例。类名必须是大写首字母。例如myClock - ＆gt; MyClock

请参阅此内容以了解有关Java中的类的更多信息： https://docs.oracle.com/javase/tutorial/java/concepts/class.html

在确定以上所有要点后，我相信您可以理解并修复您的代码。如果没有，只要ping我。

希望这有帮助！

类/方法的问题

1 个答案: