java - How to sort an array wrt to another one -

what java program perform below task?

given 2 arrays called a , c. need sort a respect c.

for example, if a={2,3,4} , c={-1,2,1}. sorting regards c produce {2,4,3}

i did in c++ using pair<>. how do same in java using inbuilt features?

you can same in java:

class pair<a, c extends comparable<c>> implements comparable<pair<a,c>> {     public final a;     public final c c;      pair(a a, c c) {         this.a = a;         this.c = c;     }      @override     public int compareto(pair<a, c> o) {         return c.compareto(o.c);     } } 

...

public static void main(string[] args) {     list<pair<integer,integer>> list = new arraylist<>();     list.add(new pair<>(2,-1));     list.add(new pair<>(3,2));     list.add(new pair<>(4,1));     collections.sort(list);     list.stream().foreach((pair) -> {         system.out.println(pair.a + " " + pair.c);     }); } 

update:

or, more simply:

class pair<a, c> {     public final a;     public final c c;      pair(a a, c c) {         this.a = a;         this.c = c;     } }  public static void main(string[] args) {     list<pair<integer,integer>> list = new arraylist<>();     list.add(new pair<>(2,-1));     list.add(new pair<>(3,2));     list.add(new pair<>(4,1));     collections.sort(list,             (pair<integer, integer> o1, pair<integer, integer> o2) -> o1.c.compareto(o2.c));     list.stream().foreach((pair) -> {         system.out.println(pair.a + " " + pair.c);     }); }