I need help making a simple math game in java.?

[bnichs5]

Task: Make a game where the computer asks you 10 questions of random numbers either added, subtracted, multiplied, or division/modulus. Have it return the amount of questions you got right. and how long it took.

Here is my code:

/**
A stopwatch accumulates time when it is running. You can 
repeatedly start and stop the stopwatch. You can use a
stopwatch to measure the running time of a program.
*/
public class Stopwatch
{ 
/**
Constructs a stopwatch that is in the stopped state
and has no time accumulated.
*/
public Stopwatch()
{ 
reset();
}
 
/**
Starts the stopwatch. Time starts accumulating now.
*/
public void start()
{ 
if (isRunning) return;
isRunning = true;
startTime = System.currentTimeMillis();
}
 
/**
Stops the stopwatch. Time stops accumulating and is
is added to the elapsed time.
*/
public void stop()
{ 
if (!isRunning) return;
isRunning = false;
long endTime = System.currentTimeMillis();
elapsedTime = elapsedTime + endTime - startTime;
}
 
/**
Returns the total elapsed time.
@return the total elapsed time
*/
public long getElapsedTime()
{ 
if (isRunning) 
{ 
long endTime = System.currentTimeMillis();
return elapsedTime + endTime - startTime;
}
else
return elapsedTime;
}
 
/**
Stops the watch and resets the elapsed time to 0.
*/
public void reset()
{ 
elapsedTime = 0;
isRunning = false;
}
 
private long elapsedTime;
private long startTime;
private boolean isRunning;
}
______________________________________…
import java.util.Scanner;
import java.util.Random;
public class Mathgame {
 
 
 
public void addition(){
int count=0;
Scanner number = new Scanner(System.in);
for(int question=0; question<10; question++){
Random generator = new Random(19580427);
Random generator2 = new Random(19580427);
int r = generator.nextInt();
int q = generator2.nextInt();
System.out.println("Question 1. " + r + " + " + q + "?");
int answer = number.nextInt();
if(answer ==(r+q))
{
count++;	
}
}
 
}
public void subtract(){
int count=0;
Scanner number = new Scanner(System.in);
for(int question=0; question<10; question++){
Random generator = new Random(19580427);
Random generator2 = new Random(19580427);
int r = generator.nextInt();
int q = generator2.nextInt();
System.out.println("Question 1. " + r + " - " + q + "?");
int answer = number.nextInt();
if(answer ==(r-q))
{
count++;	
}
}
}
 
 
public void Multiplication(){
int count=0;
 
Scanner number = new Scanner(System.in);
for(int question=0; question<10; question++){
Random generator = new Random(19580427);
Random generator2 = new Random(19580427);
int r = generator.nextInt();
int q = generator2.nextInt();
System.out.println("Question 1. " + r + " X " + q + "?");
int answer = number.nextInt();
if(answer ==(r*q))
{
count++;	
}
}
 
}
 
public void Modulus(){
int count=0;
Scanner number = new Scanner(System.in);
for(int question=0; question<10; question++){
Random generator = new Random(19580427);
Random generator2 = new Random(19580427);
int r = generator.nextInt();
int q = generator2.nextInt();
System.out.println("Question 1. " + r + " / " + q + "?");
int answer = number.nextInt();
if(answer ==(r%q))
{
count++;	
}
}
}
 
 
}
______________________________________
import java.util.Scanner;
public class MathgameRunner {
 
public static void main(String[] args) {
int x=1;
while(x>0){
System.out.println("Choose a game to Play!");
Scanner test=new Scanner(System.in);
String choice = test.nextLine();
 
 
if(choice=="addition"){
 
}
if(choice=="subtraction"){
 
 
}
if(choice=="multiplication"){
 
}
if(choice=="modulus"){
 
}
else
{
System.out.println("Invalid Choice!");
}
 
 
 
}
 
}
 
}

This is incomplete because I can not figure out what to put in the Mathgamerunner.java

[copeg]

Please wrap your code in the code tags, and if you seek help I recommend asking a question.

[Norm]

Do you have any problems with the code?
If so copy and paste here the error messages
or the program's output with your comments about what is wrong with the output.

Please edit your post and wrap your code with
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

[curmudgeon]

Welcome to javaprogrammingforums.com!

To allow us to help you, you will want to edit your post and add [code] [/code] tags around your code (check out the FAQ) and you will want to ask an answerable question since I don't see any specific question yet in your post above.

Best of luck!

[Norm]

Please edit the code and format the code properly. The statements need to be indented when they are nested. All statements should NOT start in the first column. Nested statements should be indented 3-4 spaces.

Take the methods in the MathGameRunner class one at a time. Describe what should go in each method and then try to write the code for the method.