while loop - Error in the output of my java program -

i trying java program having problem output.

here error when input information.

enter social security number:12345678 

enter salary3000
please input next security numbers or -1 quit:12345666
enter salary2122
please input next security numbers or -1 quit:900000000
enter salary3000
please input next security numbers or -1 quit:-1

exception in thread "main" java.util.unknownformatconversionexception: conversion = ':'
@ java.util.formatter.checktext(formatter.java:2547)
@ java.util.formatter.parse(formatter.java:2533)
@ java.util.formatter.format(formatter.java:2469)
@ java.io.printstream.format(printstream.java:970)
@ java.io.printstream.printf(printstream.java:871)
@ salaries.output(salaries.java:57)
@ salaries.main(salaries.java:19)

and here code far..

import java.util.scanner; public class salaries {

public static void main(string[] args) {     // todo auto-generated method stub     scanner input = new scanner (system.in);      int[] ssnumbers = new int [10];     double[] salaries = new double [10];     double[] nsalaries = new double [10];     int c;      c = inputdata (ssnumbers, salaries);     raise (salaries, c);     output (ssnumbers, salaries, nsalaries); }  public static int inputdata (int[]ssn, double[]sals){      int c = 0;      scanner input = new scanner (system.in);     int ssnum;      system.out.print("enter social security number:");     ssnum = input.nextint();      while (ssnum != -1) //using while loop.     {         ssn[c] =  ssnum;          system.out.print("enter salary");         sals[c] = input.nextdouble();         c++;          system.out.print("please input next security numbers or -1 quit:");         ssnum = input.nextint();      }         return c;  } public static void raise (double[] salaries, int c)  {     double[] salaryraise = new double [10];      (int = 0; < c; i++ )     salaryraise[i] = salaries[i]*.02;  } public static void output (int[] ssnumbers, double[] salaries, double[] nsalary ) {     system.out.printf("%-20s%-20s%-20s%:\n", "social security number", "salaries", "salary after raise");     (int = 0; < salaries.length; i++)          system.out.printf("%d %.2f %.2f", ssnumbers[i], salaries[i], nsalary[i]);      return; } 

}

you have "%:" in line you'll wanna remove. (because it's not valid specifier)

system.out.printf("%-20s%-20s%-20s%:\n", "social security number", "salaries", "salary after raise"); 

:)