How can i calculate the average in java

how can i calculate the avergae mark out of two marks for instance in like exam mark out
of two other ones
thanks for considering this message

Average or Mean:
sum_of_N/N
Here N is the number of marks.
sum_of_N is the total sum of n(all marks added together)
public int average(int[] marks) {
int sum;
sum = 0;
for(int i=0;i < marks.length;i++) {
sum=marks[i]+sum; // keep adding to the total
return average = sum/marks.length;
// warning- using an int here can be a pitfall(we could have a decimal outcome).
}

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HOW can u calculate the average it wont calculate

import java.util.*;
public class Percentage
public static void main (String [] args)
System.out.println("Enter marks (value < 0 to stop");
int totalMarks = 0;
int numberOfMarks = 0;
Scanner input= new Scanner (System.in);
int nextMark = input.nextInt();
while (nextMark >= 0)
totalMarks += nextMark;
numberOfMarks++;
System.out.println("Next mark:");
nextMark = input.nextInt();
if ( numberOfMarks > 70)
int average = (totalMarks/numberOfMarks*100);
System.out.println (" Average is");
}

Compile error!?! You're regressing!
    public static void main(String[] args) {
        System.out.println("Enter marks (value < 0 to stop");
        int totalPassingScores = 0;
        int totalScores = 0;
        Scanner input = new Scanner(System.in);
        double nextMark = input.nextDouble();
        while (nextMark >= 0) {
            totalScores++;
            System.out.println("Next mark:");
            nextMark = input.nextDouble();
            if (nextMark > 70) {
                totalPassingScores++;
        double percentPassed = (float) totalPassingScores / (float) totalScores * 100.0;
        System.out.println("Number of passing scores: " + percentPassed);
    }

How can I calculate the total time in java?

Hello!
I need to calculate the total time!
For example I have start time:
          Format formatter1;
          Date date1 = new Date();
          formatter1 = new SimpleDateFormat("hh:mm:ss");
          String startTime = formatter1.format(date1);
          //startTime = "14:20:40";
And I have finish time:
          Format formatter2;
          Date date2 = new Date();
          formatter2 = new SimpleDateFormat("hh:mm:ss");
          String finishTime = formatter2.format(date2);
          //finishTime = "08:30:55";
So, after manually calculating, I get total time: "18:10:15"
How can I calculate the total time in java? (Using formatter1 and formatter2 I suppose)
What I need is to print "total 18:10:15"
Thanks!

800512 wrote:
I did the following but, I think something is wrong here:
I defined before: Date date1 = new Date(); Date date2 = new Date();
And it should be exactly 5 seconds between them.
I found delta between date1 and date2:
Format formatter = new SimpleDateFormat("HH:mm:ss");
          long timeInMilliFromStart = date1.getTime() - date2.getTime() ;
          Date date3 = new Date(timeInMilliFromStart);
          String timeInSecFromStart = formatter.format(date3);
and I get always
//timeInSecFromStart = 02:00:05
But it should be exactly 00:00:05.
What can be a problem?Because, like I said, a Date measure an instant in time, not a duration. So when you have 5000 ms, and you turn that into a Date, that means 5 sec. after the epoch, which works out to 1/1/1970 00:00:05.000 GMT.
As I mentioned, if you're not currently in GMT, then you have to set the TZ of the DateFormat to GMT. Right now, it's showing you the time in your TZ. If you included the date in your SimpleDateFormat, you'd see either 1/1/1970 or 12/31/1969, depending on which TZ you're in.
Bottom line: You're trying to use these classes in a way they're not meant for, and while you can get the results you want for a limited set of inputs if you understand what these classes do and how to work with that, it's a brittle approach and comes with all kinds of caveats.

How can I calculate the request time ?

Hello,
How can I calculate the total consume time in each request ?
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You could use a filter like this one:
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import java.net.*;
import java.util.*;
import java.text.*;
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import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
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    private long end = 0;
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    throws IOException, ServletException {
        if (debug) log("TimeFilter:DoAfterProcessing");
        System.out.println("Completion Time = " + (System.currentTimeMillis() - start));
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     * @param result The servlet response we are creating
     * @param chain The filter chain we are processing
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
    public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain)
    throws IOException, ServletException {
        if (debug) log("TimeFilter:doFilter()");
        doBeforeProcessing(request, response);
        Throwable problem = null;
        try {
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     * Set the filter configuration object for this filter.
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     * Destroy method for this filter
    public void destroy() {
     * Init method for this filter
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        sb.append(filterConfig);
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        return (sb.toString());
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            t.printStackTrace(pw);
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Hi
I am trying to calculate the average trajectory from lets say 4 runs, with varying sample size.
That is, if the the 4 runs have 78,74,73,55 samples respectively, How do I calculate the average of (78+74+73+55)/4 , (78+74+73)/3 and (78+74)/2 and 78/1 ?
Thank you

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Average or Mean:
sum_of_N/N
Here N is the number of marks.
sum_of_N is the total sum of n(all marks added together)
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int sum;
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How can i calculate the average in java

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