我正在尝试实施某些功能，但我无法做到。编译器在运行时不断抛出java.lang.NumberFormatException。
这是我的代码：
import java.util.Arrays;
import java.io.* ;
public class Staff {
public static void main(String[] args) throws Exception {
try {
//Array declaration
ManagementEmployee [] eManager=null;
EngineeringEmployee [] eEngineer=null;
AdministrationEmployee [] eAdmin=null;
//Attributes- local
int size=-1;
boolean success=false;
int contractID=0;
double totalSalary=0.0;
double eManagerSalary=0.0;
double eEngineerSalary=0.0;
double eAdminSalary=0.0;
String sizex="1";
//Attributes- Company
// name: the name of the employee, a String
String name;
//* contract: the type of contract, an int
ContractType contract=ContractType.TEMPORARY;
//* years: number of years in the company, an int
int years;
//* department: department to which he/she belongs, a String
InputStreamReader istream = new InputStreamReader(System.in) ;
BufferedReader in = new BufferedReader(istream) ;
//Managers
while(!success)
{
System.out.println("Enter no. of Management Employees: ");
sizex=in.readLine();
size=Integer.parseInt(sizex);
if(size<0)
{
throw new IllegalArgumentException("Invalid input received. There must be atleast 1 manager");
}
else
{
eManager=new ManagementEmployee[size];
success=true;
}
}
success=false;
//Engineers
while(!success)
{
System.out.println("Enter no. of Engineering Employees: ");
sizex=in.readLine();
size=Integer.parseInt(sizex);
if(size<0)
{
throw new IllegalArgumentException("Invalid input received. There must be atleast 1 engineering employee");
}
else
{
eEngineer=new EngineeringEmployee[size];
success=true;
}
}
success=false;
//Administrator
while(!success)
{
System.out.println("Enter no. of Administrator Employees: ");
sizex=in.readLine();
size=Integer.parseInt(sizex);
if(size<0)
{
throw new IllegalArgumentException("Invalid input received. There must be atleast 1 administrator");
}
else
{
eAdmin=new AdministrationEmployee[size];
success=true;
}
}
success=false;
//Management
System.out.println("Please enter the following details:");
while(!success)
{
System.out.println("Management Employee :-");
for(int i=0;i<eManager.length;i++)
{
System.out.println("Enter the name: ");
name=in.readLine();
if(name.trim().length() < 0)
{
throw new IllegalArgumentException("Invalid name. Please enter again");
}
System.out.println("Enter the no. of years in company: ");
sizex=in.readLine();
years=Integer.parseInt(sizex);
if(years<1)
{
throw new IllegalArgumentException("Invalid input received. It must be more than or equal to 1 yr.");
}
eManager[i]=new ManagementEmployee(name,years);
System.out.println(eManager[i].toString());
eManagerSalary+=eManager[i].getSalary();
}
success=true;
}
success=false;
//Engineers
while(!success)
{
System.out.println("Engineering Employee :-");
for(int i=0;i<eEngineer.length;i++)
{
System.out.println("Enter the name: ");
name=in.readLine();
if(name.trim().length() < 0)
{
throw new IllegalArgumentException("Invalid name. Please enter again");
//System.out.println("Enter the name: ");
// name=in.nextLine();
}
System.out.println("Enter the no. of years in company: ");
sizex=in.readLine();
years=Integer.parseInt(sizex);
if(years<1)
{
throw new IllegalArgumentException("Invalid input received. It must be more than or equal to 1 yr.");
//System.out.println("Enter the no. of years in company: ");
//years=in.nextInt();
}
System.out.println("Enter the contract type from following:\n 1.TEMPORARY\n2. TRAINING\n3. INDEFINITE: ");
sizex=in.readLine();
contractID=Integer.parseInt(sizex);
if(contractID<1||contractID>3)
{
throw new IllegalArgumentException("Invalid input received. It must be 1 , 2 or 3.");
//System.out.println("Enter the contract type from following:\n 1.TEMPORARY\n2. TRAINING\n3. INDEFINITE: ");
//contractID=in.nextInt();
}
if(contractID==1)
{
eEngineer[i]=new EngineeringEmployee(name,contract.TEMPORARY,years);
}
else if(contractID==2)
{
eEngineer[i]=new EngineeringEmployee(name,contract.TRAINING,years);
}
else
{
eEngineer[i]=new EngineeringEmployee(name,contract.INDEFINITE,years);
}
System.out.println(eEngineer[i].toString());
eEngineerSalary+=eEngineer[i].getSalary();
}
success=true;
}
success=false;
//Administrator
while(!success)
{
System.out.println("Administrator Employee :-");
for(int i=0;i<eAdmin.length;i++)
{
System.out.println("Enter the name: ");
name=in.readLine();
if(name.trim().length() < 0)
{
throw new IllegalArgumentException("Invalid name. Please enter again");
//System.out.println("Enter the name: ");
//name=in.nextLine();
}
System.out.println("Enter the no. of years in company: ");
sizex=in.readLine();
years=Integer.parseInt(sizex);
if(years<1)
{
throw new IllegalArgumentException("Invalid input received. It must be more than or equal to 1 yr.");
//System.out.println("Enter the no. of years in company: ");
//years=in.nextInt();
}
eAdmin[i]=new AdministrationEmployee(name,years);
System.out.println(eAdmin[i].toString());
eAdminSalary+=eAdmin[i].getSalary();
}
success=true;
}
//Total Salary
totalSalary=eManagerSalary+eEngineerSalary+eAdminSalary;
System.out.println("MANAGEMENT TOTAL SALARY:"+eManagerSalary+" bitcoins");
System.out.println("ENGINEERING TOTAL SALARY:"+eEngineerSalary+" bitcoins");
System.out.println("ADMINISTRATION TOTAL SALARY:"+eAdminSalary+" bitcoins");
System.out.println("ACME TOTAL SALARY:"+totalSalary+" bitcoins");
}
catch (NumberFormatException err) {
System.out.println(err.getMessage());
}
}
}
此代码已成功编译，但在运行时遇到错误 如何解决这个问题。
答案 0 :(得分：3)
错误的原因之一是因为你忽视了JSL
如果你看一下Integer.parseInt() jsl 它说
Throws: NumberFormatException - if the string does not contain a parsable integer.
那么当String到达ENDOFLINE时会怎样。它可以有字符，如\ r \ n或\ n，如line termination或null ，如果已达到流的结尾，显然不是＆＃ 34;可解析的整数＆＃34; 。因此，您需要在解析之前检查这些内容。
或使用java.util.Scanner
答案 1 :(得分：1)
您没有给出堆栈跟踪，但我非常怀疑您的问题是在线：
size=Integer.parseInt(sizex);
其中sizex是已输入的String。如果无法将String转换为整数，则会得到NumberFormatException。