单项选择题 11. class Payload {  12. private int weight；  13. public Payload（int wt） { weight = wt； }  13. public void setWeight（mt w） { weight = w； }  15. public String toString { return Integer.toString（weight）； }  16. }  17.  18. public class TestPayload {  19. static void changePayload（Payload p） { 20. /* insert code here */ 21. }  22.  23. public static void main（String[] args） {  24. Payload p = new Payload（）；  25. p.setWeight（1024）；  26. changePayload（p）；  27. System.out.println（”The value of p is “+ p）；  28. }  29. }  Which statement， placed at line 20， causes the code to print “The value of p is 420.”？（）

多项选择题 11.publicclassCommander{ 12.publicstaticvoidmain（String[]args）{ 13.StringmyProp=/*insertcodehere*/ 14.System.out.println（myProp）； 15.} 16.} andthecommandline： java-Dprop.custom=gobstopperCommander Whichtwo，placedonline13，willproducetheoutputgobstopper？（）

单项选择题 public class Yippee2 {  static public void main（String [] yahoo） {  for（int x= 1； xSystem.out.print（yahoo[x] + “ “）；  }  }  }  and the command line invocation： java Yippee2 a b c What is the result？（）