• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 379
  • Last Modified:

A program to calculate the elapsed time

I hope that somebody can help me  write a program to calculate the elapsed time
between the start time and the end time (both values are entered by the user in
TextField txtstartTime and TextField txtendTime.)
For example:  elapsed time = 13:30:01(endTime) - 10:45:10(startTime);
0
CG
Asked:
CG
  • 4
  • 4
1 Solution
 
CGAuthor Commented:
Adjusted points to 60
0
 
gadioCommented:
    SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yy HH:mm");    
     SimpleDateFormat resformat = new SimpleDateFormat("HH:mm");

     Date sd = formatter.parse(txtstartField.getText());
     Date ed = formatter.parse(txtendField.getText());
     Date diff = ed.getTime()-sd.getTime();
     System.out.println( resformat.format(diff) );

I hope that works since I havn't compiled it...  :-)
G.
0
 
gadioCommented:
You have to change the format definition slightly if you want to use seconds as well. Look at the SimpleDateFormat api. If you have problems, ask.
0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
CGAuthor Commented:
Hi, Gadio:
Thanks for your answer. According to your proposed answer, I wrote a program to
test it. But there was one compiler error: Identifier expected
            System.out.println (resformat.format(diff) );

import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;

public class time extends Frame
{
        static public void main(String args[])
        {      
      (new time()).setVisible(true);
        }
        public time()
        {      
                super( "Elapsed Time" );
                //{{INIT_CONTROLS
                setLayout(null);
        setSize(200,120);
            
        lbstartTime = new Label("Start Time:");
        lbstartTime.setBounds(20,60,80,25);
        add(lbstartTime);            
                txtstartTime = new TextField();
        txtstartTime.setBounds(110,60,72,25);
        add(txtstartTime);            
                lbendTime = new Label("End Time:");
        lbendTime.setBounds(20,70,80,25);
        add(lbendTime);      
                txtendTime = new TextField();
        txtendTime.setBounds(110,80,72,25);
        add(txtendTime);            

                //{{REGISTER_LISTENERS
            this.addWindowListener(new WindowAdapter(){
                  public void windowClosing(WindowEvent e){
                    System.exit(0);}
                });
      }      
       
        Label lbstartTime, lbendTime;
        TextField txtstartTime, txtendTime;
         
        SimpleDateFormat resformat = new SimpleDateFormat("hh:mm:ss");

        Date sd = resformat.parse(txtstartTime.getText());
        Date ed = resformat.parse(txtendTime.getText());
        Date diff = ed.getTime()-sd.getTime();
        System.out.println( resformat.format(diff) );
     
       
 }
0
 
gadioCommented:
I fixed it up:

import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
import java.util.Date;

public class time extends Frame
{
  Label lbstartTime, lbendTime;
  TextField txtstartTime, txtendTime;
  Button calculate;
  SimpleDateFormat formatter;
  SimpleDateFormat resformat;

  static public void main(String args[])
  {
        time t = new time();
        t.show();;
  }
  public time()
  {
        super( "Elapsed Time" );
        //{{INIT_CONTROLS
        setLayout(new FlowLayout());
        //setSize(200,120);

        lbstartTime = new Label("Start Time:");
        lbstartTime.setBounds(20,60,80,25);
        add(lbstartTime);
        txtstartTime = new TextField(10);
        txtstartTime.setBounds(110,60,72,25);
        add(txtstartTime);
        lbendTime = new Label("End Time:");
        lbendTime.setBounds(20,70,80,25);
        add(lbendTime);
        txtendTime = new TextField(10);
        txtendTime.setBounds(110,80,72,25);
        add(txtendTime);
        calculate = new Button("Calculate!");
        add(calculate);
        pack();

        formatter = new SimpleDateFormat("HH:mm:ss");
        resformat = new SimpleDateFormat("HH:mm:ss");
        //{{REGISTER_LISTENERS
        this.addWindowListener(new WindowAdapter(){
          public void windowClosing(WindowEvent e){
                System.exit(0);}
        });
        calculate.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent e) {
                try {
                  Date sd = formatter.parse(txtstartTime.getText());
                  Date ed = formatter.parse(txtendTime.getText());
                  Date diff = new Date( ed.getTime()-sd.getTime()+ 28800000 );
                  System.out.println( resformat.format(diff) );
                } catch( Exception ex ) {
                  System.out.println( ex );
                }
          }
        });
  }

}


0
 
CGAuthor Commented:
gadio:
Thanks again for your help! I tested your code. Here is a problem:
When I entered Start Time 10:30:10, and End Time 12:50:10, I got the
result 05:20:00 (should be 02:20:00). The result should be set to TextField
elapsedTime. Could you please help me to fix it?
I'm looking forward to receiving your answer soon.
0
 
gadioCommented:
Oh. There are problems with the time zone I think. use the following: replace the last try block with:

                try {
                  Date sd = formatter.parse(txtstartTime.getText());
                  Date ed = formatter.parse(txtendTime.getText());
                  long diff = ed.getTime()-sd.getTime();
                  diff /=1000;
                  long seconds = diff % 60;
                  diff /= 60;
                  long min = diff % 60;
                  diff /= 60;
                  long hours = diff;
                  System.out.println( (hours<10?"0":"")+hours+":"+(min<10?"0":"")+min+":"+(seconds<10?"0":"")+seconds );
                } catch( Exception ex ) {
                  System.out.println( ex );
                }

0
 
CGAuthor Commented:
Thanks, gadio. You are terrific!
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

  • 4
  • 4
Tackle projects and never again get stuck behind a technical roadblock.
Join Now