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  1. import java.util.Iterator;
  2. import java.util.Set;
  3. import java.util.TreeSet;
  4.  
  5. class TKO {
  6.     public static void main(String[] args) { 
  7.         before();
  8.     }
  9.  
  10. 	public static void before() { 
  11. 	    Set set = new TreeSet(); 
  12. 	    set.add("2");
  13. 	    set.add(3);
  14. 	    set.add("1"); 
  15. 	    Iterator it = set.iterator();
  16. 	        while (it.hasNext())
  17. 	    System.out.print(it.next() + " ");
  18. 	}
  19. }
Runtime error #stdin #stdout #stderr 0.06s 842240KB
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Standard input is empty
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Standard output is empty
stderr
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Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
	at java.lang.Integer.compareTo(Integer.java:52)
	at java.util.TreeMap.put(TreeMap.java:568)
	at java.util.TreeSet.add(TreeSet.java:255)
	at TKO.before(Main.java:13)
	at TKO.main(Main.java:7)
https://ideone.com/B2xL1o
language:
Java (12.0.1)
created:
6 years ago
visibility:
public

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