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  1. import java.util.ArrayList;
  2. import java.util.Collections;
  3.  
  4. class b implements Comparable<c> {
  5.     String str1;
  6.  
  7.     b(String str1) {
  8.         this.str1 = str1;
  9.     }
  10.  
  11.     public int compareTo(c object) {
  12.         return str1.compareTo(object.str1);
  13.     }
  14. }
  15.  
  16. class c implements Comparable<b> {
  17.     String str1;
  18.  
  19.     c(String str1) {
  20.         this.str1 = str1;
  21.     }
  22.  
  23.     public int compareTo(b object) {
  24.         return str1.compareTo(object.str1);
  25.     }
  26. }
  27.  
  28. public class Main {
  29.  
  30.     public static void main(String[] args) {
  31.         b obj1 = new b("monster");
  32.         c obj2 = new c("aman");
  33.         b obj3 = new b("hello");
  34.         c obj4 = new c("world");
  35.  
  36.         ArrayList list  = new ArrayList();
  37.         list.add(obj1);
  38.         list.add(obj2);
  39.         list.add(obj3);
  40.         list.add(obj4);
  41.         System.out.println("unsorted list = "+list);
  42.         Collections.sort(list);
  43.         System.out.println("sorted list = "+list);
  44.     }
  45. }
Runtime error #stdin #stdout #stderr 0.08s 380160KB
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stdin
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Standard input is empty
stdout
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unsorted list = [b@eb3c84, c@1d2162c, b@1adceb8, c@1debcf3]
stderr
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Exception in thread "main" java.lang.ClassCastException: b cannot be cast to c
	at b.compareTo(Main.java:4)
	at java.util.ComparableTimSort.binarySort(ComparableTimSort.java:232)
	at java.util.ComparableTimSort.sort(ComparableTimSort.java:158)
	at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
	at java.util.Arrays.sort(Arrays.java:472)
	at java.util.Collections.sort(Collections.java:155)
	at Main.main(Main.java:42)
https://ideone.com/OaWOB5
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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