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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.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9.  
  10. 	public static void main(String[] args) {
  11.         List<MyClass> list = new ArrayList<>(Arrays.asList(
  12.             new MyClass("Wald"),
  13.             new MyClass("Arctic"),
  14.             new MyClass("Hi"),
  15.             new MyClass("Skip"),
  16.             new MyClass(" Zulu")
  17.         ));
  18.  
  19.         Comparator<MyClass> myRules = new Comparator<MyClass>() {
  20.  
  21.             @Override
  22.             public int compare(MyClass o1, MyClass o2) {
  23.                 int order = getOrder(o1) - getOrder(o2);
  24.                 return (order != 0 ? order : o1.aString.compareTo(o2.aString));
  25.             }
  26.  
  27.             private int getOrder(MyClass m) {
  28.                 if (m.aString.startsWith(" ")) {
  29.                     return 0;
  30.                 }
  31.                 else if (m.aString.equals("Hi")) {
  32.                     return 1;
  33.                 }
  34.                 else {
  35.                     return 2;
  36.                 }
  37.             }
  38.         };
  39.  
  40.         Collections.sort(list, myRules);
  41.  
  42.         // Print the list
  43.         for (MyClass e : list) {
  44.             System.out.println(e);
  45.         }
  46.     }
  47. }
  48.  
  49. class MyClass implements Comparable<MyClass> {
  50.  
  51.     String aString;
  52.  
  53.     MyClass(String aString) {
  54.         this.aString = aString;
  55.     }
  56.  
  57.     @Override
  58.     public int compareTo(MyClass other) {
  59.         return this.aString.compareTo(other.aString);
  60.     }
  61.  
  62.     @Override
  63.     public boolean equals(Object o) {
  64.         if (o == null || !getClass().equals(o.getClass())) {
  65.             return false;
  66.         }
  67.         return Objects.equals(this.aString, ((MyClass) o).aString);
  68.     }
  69.  
  70.     @Override
  71.     public int hashCode() {
  72.         return 37 + Objects.hashCode(this.aString);
  73.     }
  74.  
  75.     public String toString() {
  76.         return "MyClass(" + this.aString + ")";
  77.     }
  78. }
Success #stdin #stdout 0.05s 2184192KB
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MyClass( Zulu)
MyClass(Hi)
MyClass(Arctic)
MyClass(Skip)
MyClass(Wald)
https://ideone.com/BbEOHb
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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