183. Place the code in the appropriate places such that this program will always output [1, 2].

184. Place each Collection Type on the statement to which it applies.

188. Given a pre-generics implementation of a method: 11. public static int sum(List list){ 12. int sum = 0； 13. for(Iterator iter = list.iterator()； iter.hasNext()；){ 14. int i = ((Integer)iter.next()).intValue()； 15. sum += i； 16. } 17. return sum； 18. } What three changes allow the class to be used with generics and avoid an unchecked warning? (Choose three.) (A) Remove line 14. (B) Replace line 14 with "int i = iter.next()；". (C) Replace line 13 with "for(int i : intList){". (D) Replace line 13 with "for(Iterator iter : intList){". (E) Replace the method declaration with "sum(List＜int＞ intList)". (F) Replace the method declaration with "sum(List＜Integer＞ intList)".

191. Given: 11. //insert code here 12. private N min, max； 13. public N getMin() { return min； } 14. public N getMax() { return max； } 15. public void add(N added) { 16. if(min == null || added.doubleValue() ＜ min.doubleValue()) 17. min = added； 18. if(max == null || added.doubleValue() ＞ max.doubleValue()) 19. max = added； 20. } 21. } Which two, inserted at line 11, will allow the code to compile? (Choose two.) (A) public class MinMax＜?＞{ (B) public class MinMax＜? extends Number＞{ (C) public class MinMax＜N extends Object＞{ (D) public class MinMax＜N extends Number＞{ (E) public class MinMax＜? extends Object＞{ (F) public class MinMax＜N extends Integer＞{

199. Given: 10. interface A{void x()；} 11. class B implements A{public void x(){} public void y(){}} 12. class C extends B{public void x(){}} And: 20. java.util.List＜A＞ list = new java.util.ArrayList＜A＞()； 21. list.add(new B())； 22. list.add(new C())； 23. for(A a : list){ 24. a.x()； 25. a.y()； 26. } What is the result? (A) The code runs with no output. (B) An exception is thrown at runtime. (C) Compilation fails because of an error in line 20. (D) Compilation fails because of an error in line 21. (E) Compilation fails because of an error in line 23. (F) Compilation fails because of an error in line 25.

(1)

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1. Carte Du Jour

104年 - SCJP 201-244#99410

104年 - SCJP 51-100#99391

104年 - SCJP 151-200#99330

104年 - SCJP 1-50#41416

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