java - Comparator Won't Work -

public class test implements comparable <test>{ string name; int age; int salary; public test(string name, int age, int salary){     this.name = name;     this.age = age;     this.salary = salary; } public int compareto(test newtest){     if (this.name.compareto(newtest.name) > 0){         return 1;     } else if(this.name.compareto(newtest.name) < 0){         return -1;     } else{         return 0;     } }  public static void main(string[] args){     test albert = new test("albert", 19, 100);     test james = new test("james", 16, 50);     if (albert.compareto(james) == -1){         system.out.println("albert comes first");     } else if (albert.compareto(james) == 1){         system.out.println("james comes first");     } else{         system.out.println("it's tie");     }      int[] testarray = new int[2];     testarray[0] = albert.age;     testarray[1] = james.age;      collections.sort(testarray, new testcomparator()); } } 

i've created comparator called testcomparator , reason won't work collections.sort. i'm not sure why not working. ideas? tried array.sort didn't work. advice appreciated.

collections.sort() works list<integer>, not array.

arrays.sort() works int[] if want ascending order.

change array of type integer[] , should able use version of arrays.sort() uses comparator.