My code :
Arrays.sort(intervals, new Comparator<int[]>(){
@Override
public int compare( int[] a, int[] b ){
return a[0]==b[0] ? a[1] - b[1] : a[0] - b[0];
// return Integer.compare( a[0], b[0] );
}
});
And here is an simple way:
Arrays.sort(myArr, (a, b) -> a[0] - b[0]);