sort 2D array based on two columns

Question

I have 2D array and it has 2 columns and I want to sort this.

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input is this:

first column..... second column

3......................2

4......................9

3......................1

5......................0

1......................2

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output is this:

first column..... second column

5......................0

4......................9

3......................2

3......................1

1......................2

---

I beginner in Java.

please help me whit a code of function(mySort(int[][] arr) to sort the array.

Answer 1

You can sort with your custom comparator:

Arrays.sort(datas, new Comparator<Integer[]>() {
         @Override
         public int compare(Integer[] entry1, Integer[] entry2) {
                if(entry1[0] == entry2[0]){
                       return entry2[1] - entry1[1];
                }
                return entry2[0] - entry1[0];
         }
});