fork download
copy 
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import static java.util.Comparator.comparing;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11.     static class Parent{
  12.         final String s;
  13.         Parent(String s) {this.s=s;}
  14.         public String toString() {return s;}
  15.     }
  16.  
  17.     static class Child1 extends Parent{
  18.         Child1(String s) {super(s);}
  19.     }
  20.  
  21.     static class Child2 extends Parent{
  22.         Child2(String s) {super(s);}
  23.     }
  24.     public static void main (String[] args) throws java.lang.Exception
  25.     {
  26.         List<Parent> list = Arrays.asList(
  27.             new Child1("1a"),
  28.             new Child2("2a"), 
  29.             new Child1("1b"), 
  30.             new Child2("2b"));
  31.  
  32.         List<Class<? extends Parent>> order = Arrays.asList(Child1.class, Child2.class);
  33.  
  34.         System.out.println("before " + list);
  35.         list.sort(comparing(p -> order.indexOf(p.getClass())));
  36.         System.out.println("after " + list);
  37.  
  38.  
  39.     }
  40. }
  41.  
Success #stdin #stdout 0.17s 33460KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
before [1a, 2a, 1b, 2b]
after [1a, 1b, 2a, 2b]
https://ideone.com/XDn9PS
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!