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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.time.LocalDate;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13.  
  14.         MyObject object0 = new MyObject(null, "2018-12-01");
  15.         MyObject object1 = new MyObject(1, "2018-12-02");
  16.         MyObject object2 = new MyObject(5, "2018-12-03");
  17.         MyObject object3 = new MyObject(null, "2018-12-04");
  18.         MyObject object4 = new MyObject(null, "2018-12-05");
  19.         MyObject object5 = new MyObject(2, "2018-12-06");
  20.         MyObject object6 = new MyObject(null, "2018-12-07");
  21.  
  22.         List<MyObject> list = new ArrayList<>(Arrays.asList(object0, object1, object2, object3, object4, object5, object6));
  23.         MyObject[] res = new MyObject[list.size()];
  24.  
  25.         for (Iterator<MyObject> ite = list.iterator(); ite.hasNext(); ) {
  26.             MyObject obj = ite.next();
  27.             if (obj.getPriority() != null) {
  28.                 res[obj.getPriority() - 1] = obj;
  29.                 ite.remove();
  30.             }
  31.         }
  32.  
  33.         list.sort(Comparator.comparing(MyObject::getCreatedAt).reversed());
  34.  
  35.         System.out.println();
  36.  
  37.         int indicList = 0;
  38.         for (int i = 0; i < res.length; i++) {
  39.             if (res[i] == null) {
  40.                 res[i] = list.get(indicList++);
  41.             }
  42.         }
  43.  
  44.         for (MyObject re : res) {
  45.             System.out.println(re);
  46.         }
  47.  
  48. 	}
  49. }
  50.  
  51.  
  52. class MyObject {
  53.  
  54.     private Integer priority;
  55.  
  56.     private LocalDate createdAt;
  57.  
  58.     MyObject(Integer priority, String createdAt) {
  59.         this.priority = priority;
  60.         this.createdAt = LocalDate.parse(createdAt);
  61.     }
  62.  
  63.     Integer getPriority() {
  64.         return priority;
  65.     }
  66.  
  67.     LocalDate getCreatedAt() {
  68.         return createdAt;
  69.     }
  70.  
  71.     @Override
  72.     public String toString() {
  73.         return "MyObject{" +
  74.                 "priority=" + priority +
  75.                 ", createdAt=" + createdAt +
  76.                 '}';
  77.     }
  78. }
  79.  
Success #stdin #stdout 0.17s 2184192KB
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Standard input is empty
stdout
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MyObject{priority=1, createdAt=2018-12-02}
MyObject{priority=2, createdAt=2018-12-06}
MyObject{priority=null, createdAt=2018-12-07}
MyObject{priority=null, createdAt=2018-12-05}
MyObject{priority=5, createdAt=2018-12-03}
MyObject{priority=null, createdAt=2018-12-04}
MyObject{priority=null, createdAt=2018-12-01}
https://ideone.com/nKSm8n
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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