Java 拒绝检测任何类库

Question

这感觉非常像另一个问题的重复，但我一直无法找到解决方案。在 Eclipse(Java) 和 JGrasp 中，无论我做什么，IDE 都拒绝编译我拥有的类库。

我已经尝试使用构建路径配置在 Eclipse 中手动添加库，在工作区中创建一个文件夹，将类文件复制到其中，然后将该文件夹添加到类路径中。

在 JGrasp 中，我读到只需将类文件与运行程序文件放在同一目录中就足够了。

public class PayrollLoop
{
    public static void main(String[] args) 
    {
    // Prepare to receive output
    Scanner scan = new Scanner(System.in);

    // initialize variables
    int numberEmployees = 0;
    double totalGrossPay = 0;
    double averagePay = 0;

    Payroll employee = new Payroll();
    String repeat = "yes";

    // Loop to ask for repeated entry of employees.
    // New String method: stringObject.equals(anotherStringObject). 
    // This method returns a boolean value of True or False.

    while ( repeat.equals("yes") )  
    {
        // prompt and scan for employee name        
        System.out.print("Enter the name:   ");
        employee.setName( scan.next() );

        // prompt and scan for ID number
        System.out.print("Enter the id number:  ");
        employee.setIdNumber( scan.nextInt() );

        // prompt and scan for pay rate
        System.out.print("Enter the pay rate:   ");
        employee.setPayRate( scan.nextDouble() );

        // prompt and scan for hours worked
        System.out.print("Enter the number of hours worked: ");
        employee.setHoursWorked(scan.nextDouble());


        // what should you do to the numberEmployees variable here?
         numberEmployees ++;

        // what should you do to the totalGrossPay variable here?



        // use the getter methods to print all the employee values
        System.out.println("Name                " + employee.getName());
        System.out.println("Id number           " + employee.getIdNumber());
        System.out.println("Pay Rate            " + employee.getPayRate());
        System.out.println("Hours Worked        " + employee.getHoursWorked());
        System.out.println("Gross Pay           " + employee.grossPay());
        System.out.println();

        // Ask user if entering another and scan for response
        System.out.println();



    } // end of the while loop  



    // calculate average pay
    averagePay = totalGrossPay / numberEmployees;



    // print average pay
    System.out.println("The average pay is: " + averagePay);




    } // end of main method    
}

jGASP 错误:

 ----jGRASP exec: javac -g PayrollLoop.java
 ----   at: Oct 8, 2019, 1:15:39 PM

 ----jGRASP wedge: pid for wedge is 2648.
 ----jGRASP wedge2: pid for wedge2 is 784.
 ----jGRASP wedge2: CLASSPATH is ";.;;;C:\Program Files (x86)\jGRASP\extensions\classes".
 ----jGRASP wedge2: working directory is [H:\APCS\2019-2020 AP Computer Science\Unit 2\payrolltest] platform id is 2.
 ----jGRASP wedge2: actual command sent ["C:\Program Files\jdk-10.0.2\bin\javac.exe" -g PayrollLoop.java].
 ----jGRASP wedge2: pid for process is 5304.

PayrollLoop.java:35: error: ';' expected
        System.out.println("Enter the pay rate:     ")
                                                      ^
1 error

 ----jGRASP wedge2: exit code for process is 1.
 ----jGRASP: operation complete.

类文件已编译。

Answer 1

在jGRASP中，打开“设置”>“详细消息”，然后编译的输出也会显示类路径。您的类路径可能有些奇怪。

确保 Employee.class 命名正确(正确的大小写，没有隐藏的附加扩展名)。

如果 Employee 位于包中，则需要将该包结构复制为目录结构，因此，如果它位于包“company”中，则需要在包含“Main”(或其他位置)的目录中名为“company”的目录在类路径上)，并且 Employee.class 将位于该目录中。

如果您确实有此库的 .jar 版本，则可以使用“设置”>“PATH/CLASSPATH”>“工作空间”(或“项目...”，如果您使用的是项目)将其添加到jGRASP 中的类路径。