Thread: sorting only 1 column of 2D array

hi.. i am trying to sort my 2D array such that only the 2nd column get sorted.. i tried to use Arrays.sort(arr[a]) but it seem to sort the whole array

example of what i want:
before sort
a[0][0]= 9 a[1][0] = 50
a[0][1]= 5 a[1][1] = 5
a[0][2]= 3 a[1][2] = 78
a[0][3]= 6 a[1][3] = 23
a[0][4]= 2 a[1][4] = 67

aft sort
a[0][0]= 2 a[1][0] = 5
a[0][1]= 3 a[1][1] = 23
a[0][2]= 5 a[1][2] = 50
a[0][3]= 6 a[1][3] = 67
a[0][4]= 9 a[1][4] = 78

the code i m using now

 for (int i=0;i<dist.length;i++)
        {
            Arrays.sort(dist[i]);
        }

output of current code:
before sort
a[0][0]= 9 a[1][0] = 50
a[0][1]= 5 a[1][1] = 5
a[0][2]= 3 a[1][2] = 78
a[0][3]= 6 a[1][3] = 23
a[0][4]= 2 a[1][4] = 67

aft sort
a[0][0]= 2 a[1][0] = 9
a[0][1]= 3 a[1][1] = 23
a[0][2]= 5 a[1][2] = 50
a[0][3]= 5 a[1][3] = 67
a[0][4]= 6 a[1][4] = 78

 double[][] a1 = new double[][] {{2.5,3.6,0.7,0.01},{0.85,1.32,0.20,0.992}};

based on this the output after sorting should be
a1[0][0] = 0.01 a1[1][0] = 0.20
a1[0][1] = 0.7 a1[1][0] = 0.85
a1[0][2] = 2.5 a1[1][0] = 0.992
a1[0][3] = 3.6 a1[1][0] = 1.32

Originally Posted by Norm

When I execute this code:

      double[][] dist = new double[][] {{2.5, 3.6, 0.7, 0.01},{0.85, 1.32, 0.20, 0.992}};
      System.out.println("B="+Arrays.deepToString(dist));
      for (int i=0;i<dist.length;i++)
        {
            Arrays.sort(dist[i]);
        }
      System.out.println("A="+Arrays.deepToString(dist));

I get this printed:

It looks sorted to me.

Weird... As stated in my first post. I tried your method and did not get your result. Will check where I did wrong

thanks for all the help... think the error i 1st encounter is my stupid self trying to display a shorter version of my array.. did not realise that the value is hidden in the array index i did not wan to be displayed out...