Arrays.sort
class A { int x; A(int x) { this.x = x; } } public class Main { public static void main(String[] args) { A[] a = new A[4]; a[0] = new A(3); a[1] = new A(4); a[2] = new A(1); a[3] = new A(2); Arrays.sort(a, new Comparator<A>() { @Override public int compare(A o1, A o2) { return o1.x - o2.x; } }); System.out.println(a[0].x); System.out.println(a[1].x); System.out.println(a[2].x); System.out.println(a[3].x); } }Collections.sort class A{ int x; A(int x) { this.x = x; } } public class Main { public static void main(String[] args) { List<A> a = new ArrayList<>(); a.add(new A(3)); a.add(new A(4)); a.add(new A(1)); a.add(new A(2)); Collections.sort(a, new Comparator<A>() { @Override public int compare(A o1, A o2) { return o1.x - o2.x; } }); System.out.println(a.get(0).x); System.out.println(a.get(1).x); System.out.println(a.get(2).x); System.out.println(a.get(3).x); } }
