Thread: Help with my program.

Hi
My program is required to have 10 questions from which 5 are chosen randomly without being repeated and shown to the user.
I have written the program up to the point where I have 5 random questions shown but questions keep duplicating. I wonder if anyone can help me.

Hi and welcome to the forum.
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Can you paste the code on the forum rather than attach it. It is just easier for people to read that way, and please don't forget code tags.

Sorry here is my code:

import java.util.*;
import javax.swing.*;

class Quiz {

public static void main(String args[]){

String question[] = new String[10];//Declare Question Array
String ans[] = new String[10];// Declare Answer Array
int correct=0;//Declare correct for keeping count of correct answers
int incorrect=0;//Declare incorrect for keeping count of incorrect answers
String input;//Declare input for answers given by user
int n;//Declare n to be used as the random number below

Random r = new Random();//declaring r as a random number

question[0]= "Where is the Sea of Tranquillity?";//moon
question[1] = "Freddie Bulgara was better known as which lead singer?"; //freddie mercury
question[2] = "Robert Zimmerman is better known as whom in the music world?"; //bob dylan
question[3]= "How many teeth in a full adult set?";//32
question[4] = "Whose secretary was Miss Moneypenny?";//M
question[5] = "Who was the first person to reach the South Pole?"; //Roald Amundsen
question[6] = "The zloty is the currency of what country?";//Poland
question[7] = "What famous Australian landmark was opened in 1932?"; //Sydney Harbour Bridge
question[8] = "Siam is the former name for which country?";//Thailand
question[9] = "What do the letters DVD stand for?";//Digital Versatile Disk

ans[0]="Moon";
ans[1]="Freddie Mercury";
ans[2]="Bob Dylan";
ans[3]= "32";
ans[4]="M";
ans[5]="Roald Amundsen";
ans[6]="Poland";
ans[7]="Sydney Harbour Bridge";
ans[8]="Thailand";
ans[9]="Digital Versatile Disk";

for (int i =0; i<5; i++){
n=r.nextInt(10);//Declare n as the random number between 0-9
input=JOptionPane.showInputDialog(null, question[n]);

String input1= input.trim();//Trim answer

if(input1.equalsIgnoreCase(ans[n])){
correct++;
}

else {
JOptionPane.showMessageDialog(null, "Sorry that was incorrect\n The answer we were looking for was "+ans[n]);
incorrect++;
}

}

int output1=correct*20;//to work out correct percentage rate


//Output message pane showing results
JOptionPane.showMessageDialog(null, correct+ " right answers\n" +incorrect+ " incorrect answers\n " + output1+"% Success Rate ");
}
}