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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    static void swap(List<?> list) {
      var e = list.get(0);
      var f = list.get(1);
      list.set(0, f);
      list.set(1, e);
    }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

Main.java:13: error: incompatible types: Object cannot be converted to CAP#1
      list.set(0, f);
                  ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object from capture of ?
Main.java:14: error: incompatible types: Object cannot be converted to CAP#1
      list.set(1, e);
                  ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object from capture of ?
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors

Standard output is empty