java '*'的问题

public class hello
{
 public static void main(String[] args)
 {
  int a = Integer.parseInt(args[0]);
  char b = args[1].charAt(0);
  int c = Integer.parseInt(args[2]);
  switch(b)
  {
  case '+':System.out.print(a+" "+b+" "+c+" "+"= "+(a+c));
  break;
  case '-':System.out.print(a+" "+b+" "+c+" "+"= "+(a-c));
  break;
  case '*':System.out.print(a+" "+b+" "+c+" "+"= "+(a*c));
  break;
  case '/':System.out.print(a+" "+b+" "+c+" "+"= "+(a/c));
  break;
  default:break;
  }
 }
}
程序编译后

输入 +  -  /  运算后都没问题

关键是 * 的运算

有提示报错 

Exception in thread "main" java.lang.NumberFormatException: For input string: ".project"
 at java.lang.NumberFormatException.forInputString(Unknown Source)
 at java.lang.Integer.parseInt(Unknown Source)
 at java.lang.Integer.parseInt(Unknown Source)
 at hello.main(hello.java:8)

??????????

不明白~~~~