Sort bidimensionnal double array java

Question

I'm having some troubles sorting my dynamic bidimensionnal array. I searched and found this solution :

Double[][] sortedOutput = new Double[length][4];

//... 
// processing and filling my tab like that
sortedOutput[k][0] = content[i].getLeftSpeed);
sortedOutput[k][1] = content[i].getRightSpeed();
sortedOutput[k][2] = content[i].getNormAvgPowOutput();

// ... 
// Now i'm trying to sort the tab
Arrays.sort(sortedOutput, new java.util.Comparator<double[]>()
{
  public int compare(double[]a, double[]b)
  {
    return Double.compare(a[0], b[0]);
  }
});

But somehow i doesn't work :

The method sort(T[], Comparator<? super T>) in the type Arrays is not applicable for the arguments (Double[][], new Comparator<double[]>(){})

Why can't i use Arrays.sort with double ?

I also tried to make a class :

package IOControl;

import java.util.Comparator;

public class CompareDoubleArray implements Comparator<double[]>
{
     private int column;

     public CompareDoubleArray(int column)
     {
        this.column = column;
     }

     public int compare(double[] arg0, double[] arg1) 
     {
        return Double.valueOf(arg0[column]).compareTo(Double.valueOf(arg1[column]));
     }
 }

How should i use my class ? What did i do wrong? Any help would be nice, thanks :)

Answer 1

You need to type your Comparator on Double[] . A double[] is not the same thing as Double[] . One is an array of primitives the other is an array of Double objects which are wrappers for primitives.

Arrays.sort(sortedOutput, new java.util.Comparator<Double[]>()
{
  public int compare(Double[]a, Double[]b)
  {
    return Double.compare(a[0], b[0]);
  }
});

Answer 2

Arrays.sort takes only single dimensional array as argument.So you can't use multidimensional array here

Try this code may help you.

for(Double[] d : sortedOutput){
   Arrays.sort(d , new Comparator<Double>(){
         @Override
         public int compare(Double o1, Double o2) {

        //implement logic here
         }
   });
 }