我正在制作一个程序，初始化每个员工的值，然后最终显示出来。在大约第四个循环之后，我一直遇到扫描仪问题，我收到错误 java.lang.IllegalStateException 扫描仪关闭，任何建议都会有帮助。
for(int x = 0; x < 5; x++)
{
System.out.println("For an employee who get salary enter #1.");
System.out.println("For an employee who's hourly enter #2.");
System.out.println("For an employee who's paid comission enter #3");
System.out.println("For an employee who's base & comission enter #4 or 0 to quit.");
Employees[x] = keyboard.nextInt();
switch (Employees[x])
{
case 1:
System.out.println("Please enter your first name.");
FName[x] = keyboard.next();
System.out.println("Please enter your last name.");
LName[x] = keyboard.next();
System.out.println("Please enter your social security in format 111-11-1111");
SS[x] = keyboard.next();
System.out.println("Please enter your salary amount $.");
Check[x] = keyboard.nextDouble();
SalariedEmployee salariedEmployee =
new SalariedEmployee( FName[x], LName[x], SS[x], Check[x] );
employees[x] = salariedEmployee;
break;
case 2:
System.out.println("Please enter your first name.");
FName[x] = keyboard.nextLine();
System.out.println("Please enter your last name.");
LName[x] = keyboard.nextLine();
System.out.println("Please enter your social security in format 111-11-1111");
SS[x] = keyboard.nextLine();System.out.println("Please enter your first name.");
System.out.println("How many hours were worked?");
Hours[x] = keyboard.nextInt();
System.out.println("How much paid per hour?");
Rate[x] = keyboard.nextDouble();
HourlyEmployee hourlyEmployee =
new HourlyEmployee( FName[x], LName[x], SS[x], Hours[x], Rate[x] );
employees[x] = hourlyEmployee;
break;
case 3:
System.out.println("Please enter your first name.");
FName[x] = keyboard.nextLine();
System.out.println("Please enter your last name.");
LName[x] = keyboard.nextLine();
System.out.println("Please enter your social security in format 111-11-1111");
SS[x] = keyboard.nextLine();System.out.println("Please enter your first name.");
System.out.println("What was your weekly sale?");
CommissionSales[x] = keyboard.nextDouble();
System.out.println("What is your percentage paid commission?");
CommissionRate[x] = keyboard.nextDouble();
HourlyEmployee hourlyEmployee =
new HourlyEmployee( FName[x], LName[x], SS[x], Hours[x], Rate[x] );
employees[x] = hourlyEmployee;
break;
case 4:
System.out.println("Please enter your first name.");
FName[x] = keyboard.nextLine();
System.out.println("Please enter your last name.");
LName[x] = keyboard.nextLine();
System.out.println("Please enter your social security in format 111-11-1111");
SS[x] = keyboard.nextLine();
System.out.println("What was your weekly sale?");
CommissionSales[x] = keyboard.nextDouble();
System.out.println("What is your percentage paid commission?");
CommissionRate[x] = keyboard.nextDouble();
System.out.println("Please enter your salary amount $.");
Check[x] = keyboard.nextDouble();
BasePlusCommissionEmployee basePlusCommissionEmployee =
new BasePlusCommissionEmployee( FName[x], LName[x], SS[x], CommissionSales[x], CommissionRate[x], Check[x]);
employees[x] = basePlusCommissionEmployee;
break;
}
最佳答案
如果您在尝试使用扫描仪时关闭了扫描仪，那么您使用的所有Scanner方法都会抛出IllegalStateException。在代码中的某个位置，您可能有 keyboard.close()。删除这一行，或者将其移动到程序的末尾，就可以了。来自 Java 文档:
Attempting to perform search operations after a scanner has been closed will result in an IllegalStateException.
关于java - 扫描仪问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23188433/