Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I'm making that assumption that the things you are comparing are <code>int</code>. In the case of both variables being equal, you are still returning 1 from the inner comparison. Something like this should help:</p> <pre><code>public class FCFSComparator implements Comparator&lt;Process&gt; { public int compare(Process o1, Process o2) { int result = o1.getArrivalTime() - o2.getArrivalTime(); if (result == 0) { return o1.getPid() - o2.getPid(); } else { return result; } } } </code></pre> <p>EDIT: I checked the above code and it does output the correct order. I can only assume you have a bug somewhere else in your code.</p> <pre><code>Pid = 0 arrival time = 10 Pid = 2 arrival time = 15 Pid = 3 arrival time = 15 Pid = 1 arrival time = 30 Pid = 4 arrival time = 66 </code></pre> <p>The full test code is:</p> <pre><code>import java.util.Comparator; import java.util.List; import java.util.ArrayList; import java.util.Collections; public class Main { public static void main(String[] args) { List&lt;Process&gt; processes = new ArrayList&lt;Process&gt;(); processes.add(new Process(10, 0)); processes.add(new Process(30, 1)); processes.add(new Process(15, 2)); processes.add(new Process(15, 3)); processes.add(new Process(66, 4)); Collections.sort(processes, new FCFSComparator()); for (Process process : processes) System.out.println("Pid = " + process.getPid() + " arrival time = " + process.getArrivalTime()); } static class FCFSComparator implements Comparator&lt;Process&gt; { public int compare(Process o1, Process o2) { int result = o1.getArrivalTime() - o2.getArrivalTime(); if (result == 0) { return o1.getPid() - o2.getPid(); } else { return result; } } } static class Process { private int arrivalTime; private int pid; Process(int arrivalTime, int pid) { this.arrivalTime = arrivalTime; this.pid = pid; } public int getArrivalTime() { return arrivalTime; } public int getPid() { return pid; } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POHow to define a Comparator in Java that compares based on two variables
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJon
    1. USJon
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThis doesn't seem to work. I have the same issue as with my code.
      singulars
      1. PO
      1. USVarun Madiath
    2. COWhat is the datatype of pid and arrival time?
      singulars
      1. PO
      1. USJon
    3. CO@Varun Madiath you tried debuging or printing values of getArrivalTime()? Implementation seems good to me, but it looks like result is always 0
      singulars
      1. PO
      1. USdantuch
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload