Trap Questions in Java and Obj-C

Transcript

1. 1.

   4XJGU,PUMJOѪ޷ձ 7PM
   
   !(.0ϖύϘ

2. 2.

   4XJGUͱ,PUMJO

3. 3.

   4XJGUͱ,PUMJO

4. 4.

   +BWBͱ0CKFDUJWF$
   ͷ࿩Λ͠·͢

5. 5.

   ͳΜͰࠓ͞Β+BWB0CK$

6. 6.

   ͳΜͰࠓ͞Β+BWB0CK$ w ࠓͷ࣌୅ΞϓϦ͸4XJGU,PUMJOͰॻ͘ͷ͕౰ͨΓલ
   w ࠓͲ͖+BWB0CK$ͳΜͯ৮ΒΜ΍Ζ

7. 7.

   Ռͨͯ͠ຊ౰ʹͦ͏ͩΖ͏͔ʁ

8. 8.

   Ռͨͯ͠ຊ౰ʹͦ͏ͩΖ͏͔ʁ w 044ϥΠϒϥϦ͸ϦϦʔε͞Εͨ࣌୅΍ϥΠϒϥϦͷಛ ੑ্+BWB0CK$Ͱॻ͔Ε͍ͯΔ΋ͷ΋·ͩ·ͩଟ͍
   w ࣮૷Λ֬ೝͨ͠Γ13Λग़ͨ͠Γ͢ΔͳΒ΍ͬͺΓͦͷล ͷ஌ࣝ͸ඞཁ

9. 9.

   ͱ͍͏͜ͱͰ

10. 10.

    ҙ֎ͱҾ͔͔ͬΔʂʁ
    ݴޠ࢓༷ΫΠζ
    +BWB0CKFDUJWF$ฤ

11. 11.

    w 5BLVIJSP
    .VUB
    BLB
    ௣໊Նر ,*
    w 4&೥
    8FC
    J04
    "OESPJE
    ৽ਓݚमߨࢣFUD

    
 J04 डୗ։ൃ ೥൒
 J04 ࣗࣾ։ൃ
    
    ࠓίί
    w 5XJUUFS
    2JJUB
    @LJ
 (JU)VC
    ,*
    w 4XJGUѪ޷ձࢀՃप೥
 ΋͏΍ΜΧϨʔ͸೥໨ ͓લ୭Α
12. 12.

    #VJME$POpHTXJGU
    ελʔ͍ͩ͘͞
    

13. 13.

    ݴޠ࢓༷ΫΠζ w +BWB
    ໰
    w 0CKFDUJWF$
    ໰

14. 14.

    +BWBฤ

15. 15.

    ୈ໰

16. 16.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ

17. 17.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)

    { while (false) { System.out.println("hoge"); } } }
18. 18.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)

    { while (false) { System.out.println("hoge"); } } } 
    lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ 
    Կ΋ى͖ͳ͍ 
    ίϯύΠϧΤϥʔ 
    ࣮ߦ࣌Τϥʔ
19. 19.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)

    { while (false) { System.out.println("hoge"); } } } 
    lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ 
    Կ΋ى͖ͳ͍ 
    ίϯύΠϧΤϥʔ 
    ࣮ߦ࣌Τϥʔ
20. 20.

    ղઆ public class Sample { public static void main(String... args)

    { while (false) { System.out.println("hoge"); } } } 6OSFBDIBCMF
    DPEF
21. 21.

    ୈ໰

22. 22.

    ୈ໰Λ౿·͑ͯ public class Sample { public static void main(String... args)

    { while (false) { System.out.println("hoge"); } } }
23. 23.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)

    { do { System.out.println("hoge"); } while (false); } }
24. 24.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)

    { do { System.out.println("hoge"); } while (false); } } 
    lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ 
    Կ΋ى͖ͳ͍ 
    ίϯύΠϧΤϥʔ 
    ࣮ߦ࣌Τϥʔ
25. 25.

    ࣍ͷίʔυͷಈ͖͸Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)

    { do { System.out.println("hoge"); } while (false); } } 
    lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ 
    Կ΋ى͖ͳ͍ 
    ίϯύΠϧΤϥʔ 
    ࣮ߦ࣌Τϥʔ
26. 26.

    public class Sample { public static void main(String... args) {

    do { System.out.println("hoge"); } while (false); } } ղઆ EPXIJMF͸ࣄޙධՁ ճॲཧͨ͠ޙʹ৚݅ࣜΛ൑ఆ
27. 27.

    ղઆ ॲཧ ৚ ݅ XIJMF ॲཧ ৚ ݅ EPXIJMF

28. 28.

    0CKFDUJWF$ฤ

29. 29.

    ୈ໰

30. 30.

    Կ͕ग़ྗ͞ΕΔʁ

31. 31.

    Կ͕ग़ྗ͞ΕΔʁ if (@0) { NSLog(@"true"); } else { NSLog(@"false"); }

32. 32.

    Կ͕ग़ྗ͞ΕΔʁ if (@0) { NSLog(@"true"); } else { NSLog(@"false"); }

    
    USVF 
    GBMTF
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    Կ͕ग़ྗ͞ΕΔʁ if (@0) { NSLog(@"true"); } else { NSLog(@"false"); }

    
    USVF 
    GBMTF
34. 34.

    ղઆ w @0͸</4/VNCFS
    OVNCFS8JUI*OU>ͷ4ZOUBY
    4VHBS
    w /4/VNCFS͸ΦϒδΣΫτ
    w ΦϒδΣΫτͱͯ͠͸ଘࡏ͢ΔͨΊɺ
 USVFͱͯ͠൑ఆ͞ΕΔ
    w @NO΋ಉ༷

35. 35.

    ୈ໰

36. 36.

    Կ͕ग़ྗ͞ΕΔʁ

37. 37.

    Կ͕ग़ྗ͞ΕΔʁ [ "hoge", "fuga", null, "foo", "bar" ] TBNQMFKTPO NSArray

    *array = ... // JSONΛಡΈࠐΉॲཧ if (array[2]) { NSLog(@"true"); } else { NSLog(@"false"); }
38. 38.

    Կ͕ग़ྗ͞ΕΔʁ 
    USVF 
    GBMTF [ "hoge", "fuga", null, "foo", "bar" ]

    TBNQMFKTPO NSArray *array = ... // JSONΛಡΈࠐΉॲཧ if (array[2]) { NSLog(@"true"); } else { NSLog(@"false"); }
39. 39.

    Կ͕ग़ྗ͞ΕΔʁ 
    USVF 
    GBMTF [ "hoge", "fuga", null, "foo", "bar" ]

    TBNQMFKTPO NSArray *array = ... // JSONΛಡΈࠐΉॲཧ if (array[2]) { NSLog(@"true"); } else { NSLog(@"false"); }
40. 40.

    ղઆ w /4"SSBZ౳ͷίϨΫγϣϯʹ͸OJMΛೖΕΔ͜ͱ͕Ͱ͖ͳ ͍
    w େମखஈͱͯ͠/4/VMMͱ͍͏ΫϥεΛ࢖͏
    w ͜ͷ࣌BSSBZ<>͔ΒऔΓग़͞ΕΔͷ͸</4/VMM
    OVMM>ͱ͍͏ γϯάϧτϯΦϒδΣΫτ
    w

    ΦϒδΣΫτͳͷͰUSVFͱͯ͠൑ఆ͞ΕΔ
41. 41.

    /4/VMMͱOJM NSLog(@"%@", nil); // -> (null) NSLog(@"%@", [NSNull null]); //

    -> <null> ഑ྻʹฆΕ͍ͯΔOVMM͸Α͘ݟམͱ͕ͪ͠
42. 42.

    ͜ΜͳΜ஌ͬͯͯԿʹͳΔʁ

43. 43.

    ͜ΜͳΜ஌ͬͯͯԿʹͳΔʁ w +BWB
    w 0$+1 0SBDMFೝఆࢿ֨ Ͱ͜͏͍͏໰୊͕ग़୊͞ΕΔ
    w ࣮຿Ͱ࢖͏ҙຯ͸໓ଟʹແ͍͕ɺ
 ϨΨγʔͳγεςϜͰۃكʹฆΕࠐΜͰΔ
    

    w Ϧʔμϒϧίʔυͬͯ஌ͬͯΔʁ
44. 44.

    ͜ΜͳΜ஌ͬͯͯԿʹͳΔʁ w 0CK$
    w ҙ֎ͱݟམͱ͕ͪ͠
    w ͜ͷखͷޡղ͔ΒੜͣΔόά͕࣮ࡍʹ͋ͬͨ
    w 4XJGU΁ͷϦϓϨʔεͰ૝ఆͱҧ͏ಈ͖Λ͢Δͱ͔
    w

    ಛʹ഑ྻʹฆΕࠐΉOVMM໰୊͸͋Δ͋Δ
45. 45.

    ͜ΜͳΜ஌ͬͯͯԿʹͳΔʁ w ͍ͭͰʹ
    w ৽ਓݚमͰυϠΕΔ

46. 46.

    ·ͱΊ w ϨΨγʔݴޠͷཧղ͸ϦϓϨʔεͷڧ͍ຯํ
    w ࢥΘ͵όάΛੜ·ͳ͍ͨΊʹ΋ݴޠ࢓༷ͷཧղ͸େ੾
    w ࣮຿Ͱ࢖Θͳ͍஌͔ࣝͩΒͬͯܰࢹ͠ͳ͍Α͏ʹ

47. 47.

    ྑ͍͓೥Λʂ✋