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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6.     public static class Class1 implements Comparable<Object>{
  7. String name;
  8.  
  9. public Class1(String name) {
  10.     super();
  11.     this.name = name;
  12. }
  13.  
  14. @Override
  15. public String toString() {
  16.     return "Class1 [name=" + name + "]";
  17. }
  18.  
  19. @Override
  20. public int compareTo(Object o) {
  21.     return (o instanceof Class1)?compareTo((Class1)o):compareTo((Class2)o);
  22. }
  23.  
  24. public int compareTo(Class1 o){
  25.     return name.compareTo(o.name);
  26. }
  27.  
  28. public int compareTo(Class2 o){
  29.     return name.compareTo(o.name2);
  30. }
  31.  
  32. }
  33.     public static class Class2 implements Comparable<Object>{
  34. String name2;
  35.  
  36. public Class2(String name) {
  37.     super();
  38.     this.name2 = name;
  39. }
  40.  
  41. @Override
  42. public String toString() {
  43.     return "Class2 [name=" + name2 + "]";
  44. }
  45.  
  46. @Override
  47. public int compareTo(Object o) {
  48.     return (o instanceof Class1)?compareTo((Class1)o):compareTo((Class2)o);
  49. }
  50.  
  51. public int compareTo(Class1 o){
  52.     return name2.compareTo(o.name);
  53. }
  54.  
  55. public int compareTo(Class2 o){
  56.     return name2.compareTo(o.name2);
  57. }
  58.  
  59. }
  60. 	public static void main (String[] args) throws java.lang.Exception
  61. 	{
  62.     PriorityQueue<Object> queue=new PriorityQueue<Object>();
  63.     Object o1=new Class1("o1");
  64.     Object o2=new Class2("o2");
  65.     Object o3=new Class1("o3");
  66.     Object o4=new Class1("o4");
  67.     Object o5=new Class2("o5");
  68.     Object o6=new Class2("o6");
  69.     Object o7=new Class1("o7");
  70.     Object o8=new Class2("o8");
  71.     Object o9=new Class1("o9");
  72.     Object o0=new Class1("o0");
  73.     queue.add(o7);
  74.     queue.add(o4);
  75.     queue.add(o3);
  76.     queue.add(o8);
  77.     queue.add(o5);
  78.     queue.add(o1);
  79.     queue.add(o2);
  80.     queue.add(o9);
  81.     queue.add(o0);
  82.     queue.add(o6);
  83.  
  84.     Object last;
  85.     while ((last = queue.poll()) != null) {
  86.             System.out.println(last);
  87.     }
  88. 	}
  89. }
Success #stdin #stdout 0.07s 380160KB
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Standard input is empty
stdout
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Class1 [name=o0]
Class1 [name=o1]
Class2 [name=o2]
Class1 [name=o3]
Class1 [name=o4]
Class2 [name=o5]
Class2 [name=o6]
Class1 [name=o7]
Class2 [name=o8]
Class1 [name=o9]
https://ideone.com/O9wuKD
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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