fork(2) download
  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) throws java.lang.Exception
  11. {
  12. List<Integer> integers = new ArrayList<Integer>();
  13. integers.add(1);
  14. List<String> strings = (List<String>)(Object)integers;
  15. strings.add("2");
  16. System.out.println((Integer)integers.get(1));
  17. }
  18. }
Runtime error #stdin #stdout #stderr 0.06s 380224KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
	at Ideone.main(Main.java:16)