java - Nested Loops and Rolling Dice -

i assigned project in need make program, making use of nested loops, takes user input on how many sides pair of dice has , how many times roll it. program should calculate probability of rolling number combinations. program simple because gives of code, need put in correct order. i've been working @ foir few days haven't seemed able make work. here's have code:

/** * program roll dice selected amount of sides selected amount of times. * * timothy pierce * 1/5/2016 * */ import java.util.scanner; import java.util.random; class diceprobability {   public static void main (string[] args)   {       //initalizing variables       int numrolls = 0;       int numsides = 0;       int match = 0;       int sum = 0;        //accepting user input       scanner in = new scanner(system.in);       system.out.print("please enter number of rolls: ");       numrolls = in.nextint();       system.out.print("please enter number of sides on dice: ");       numsides = in.nextint();       system.out.print("\n sum of dice \t probability \n");        //begin loops       for(int roll = 0; roll < numrolls; roll++)       {           for(sum = 2; sum <= (numsides*2); sum++)           {               int die1 = 0;               int die2 = 0;               random randnum = new random();               die1 = randnum.nextint(numsides)+1;               die2 = randnum.nextint(numsides)+1;               if(die1 + die2 == sum)               {                   match = 0;                   match++;               }               double probability = 0.0;               probability = (double)match / numrolls * 100;               system.out.println("     " + sum + "\t\t" + probability);           }       }   }//end method }//end class 

all of code there, not in right order. format of output should be: line asking number of rolls, line asking number of sides, line header has 1 column sum of dice , probability, , loops should "roll dice" , predict probability each number. ie have 2 columns: 1 sum, probability. should go down in order 2,3,4,5,6 etc.with corresponding probability in next column directly beside it. appreciated!

maybe there wrong wiht code， not order.so try write one, try it.

/** * program roll dice selected amount of sides selected amount of times. * * fergus wang * 1/6/2016 * */ import java.util.scanner; import java.util.random; class diceprobability {   public static void main (string[] args)   {       //initalizing variables       int numrolls = 0;       int numsides = 0;       int match = 0;       int sum = 0;        //accepting user input       scanner in = new scanner(system.in);       system.out.print("please enter number of rolls: ");       numrolls = in.nextint();       system.out.print("please enter number of sides on dice: ");       numsides = in.nextint();       system.out.print("\n sum of dice \t probability \n");       // list save match times.       int[] matchlist = new int[numsides*2+1];       // creat random tool.       random randnum = new random();       // begin loops       for(int roll = 0; roll < numrolls; roll++)       {           int die1 = 0;           int die2 = 0;            die1 = randnum.nextint(numsides)+1;           die2 = randnum.nextint(numsides)+1;           int tempsum = die1 + die2;           // check sum value.           for(sum = 2; sum <= (numsides*2); sum++)           {               if(tempsum == sum)               {                   matchlist[sum-2]++;               }           }       }        for(int index = 0; index<numsides*2-1; index++){           double probability = 0.0;           probability = (double)matchlist[index] / numrolls * 100;           system.out.println("     " + (index+2) + "\t\t" + probability);       }   }//end method }//end class