java - Sort list on base of multiple criteria -

i sort list on base of multiple criteria.

public class customercomparator implements comparator<customer> {      public int compare(customer customer1, customer customer2) {         int comparison = -1;         comparison = customer2.getcustomerpriority().compareto(customer1.getcustomerpriority());         if( comparison == 0 ) {             comparison = customer1.getcustomernumber().compareto(customer2.getcustomernumber());         }     return comparison;     } } 

basically, want sort in following order. customer higher priority should on top of list, , if 2 customers have same priority 1 lower customer number should go first.

original:

customer priority 1        0        2        0 3        1 4        0 5        0 

it should sorted below:

customer   priority 3          1 1          0 2          0 4          0 5          0 

thanks help. dd

java's arrays.sort , collections.sort both stable sorting algorithms meaning can sort 1 comparator , another, , values considered equivalent second still ordered first.

it looks you've composed 2 comparator's 1 though, pass the version of sort takes comparator:

this sort guaranteed stable: equal elements not reordered result of sort.

sorting n different comparators in series,

public static <t> void sort(collection<t> c, comparator<? super t>... cmps) {   (comparator<? super t> cmp : cmps) { collections.sort(c, cmp); } } 

should functionally equivalent sorting once composition of comparators

public static <t> void sort(collection<t> c, comparator<? super t>... cmps) {   collections.sort(c, new comparator<t>() {     public int compare(t a, t b) {       (int = cmps.length; --i >= 0;) {         int delta = cmps[i].compare(a, b);         if (delta != 0) { return delta; }       }       return 0;     }   }); }