1. Null was used as an exception to point out issues. 2. Null used three sentences to summarize the key details. 3. Null's summary highlighted the object, option, exception handling, and Kotlin programming language.

1. 鏈屠-QVNKP▪㈘飍.6徨㡺

2. 鰰鰛鰆鱄猳瓹㣆鰳02'鰘簉義鰈鰗鰯鰊鯼～猳猳

3. 02'
0WNN2QKPVGT'ZEGRVKQP

4. 0WNN餿䑈鱃鋶㣯鰈鰐鱆鲗鱬鱯鯮・鱿鯮鱆␩䠀鰠
鰄鯷峡鰔鰗鯵鰯鰊珯

5. 鰅鰲鱄桴蓄鯹鰐
鯻┮鰺⏥鱭鲏鰀鰺鯵㛮鰈鰐鰘ww

6. ㅕ鰟鱏鲗鱹鱅鲐鲗鱝鰘0WNN餿䑈鱃鋶㣯鰈鰐鰄鰙鰜鰕鯵鰗荽羄鰈鰗鯵鰼珯
鰎鰽鰠⏥鱭鲏鰜鰳䧙㈴鰊鰼䲢鰟荟鰻鰑珯
PWNN餿䑈鱃鋶㣯鰈鰐鰟鰠ㅕ鰟鰄鰙鰑鰔鰐珯
㈴窸䲢鰠鱎鱺鱜鱋鱓鱬稊⛲峡嵿
#.)1.9鰜鯻鰂鰼餿䑈鰟鰐鰲鰟◦㗍䥥⩬鱛鱝鱪鲄
鱃崎峩鰈鰗鯵鰐珯
䧏㳺鰠鱗鲗鱵鱈鲍鰘鰟哋▶鱥鱋鱧鱓鰘畷鰗鰟餿䑈鯽⹭畷鰜碨畷鰘鯳鰼鰄鰙鱃⊾崝鰊
鰼鰄鰙鰑鰔鰐珯
鰈鯼鰈珮䲢鰠☹鰜鰎鰽鯽⺚㣴鰑鰙鯵鯷鰑鰂鰘珮糃覛鰛餿䑈鱃痘鰲鰼嵹㎲鰜秿㕸鰘鯾
鰛鯼鰔鰐珯
鰄鰽鰠祱鰜窚鯹ⓨ鰽鰛鯵蒽鰒珮聡㈒㌈珮鱛鱝鱪鲄鱓鲍鱧鱛鲉鱃ㇶ鯾菈鰄鰈珮蒽⚜
ㅕ桴鰘⏥鱭鲏䧙㈴鰟嗇䢼鰙㛮碪鱃ㇶ鯾菈鰄鰈鰐鰙鰰鰺鰽鰼珯
!
～HTQO9KMKRGFKC～

7. PWNN鰔鰗鱀鰼鯵盡鰛鱄獑

8. 0WNN鰠㎋鰀鰛鯵鱄鰘鰊
0WNN鰑鰔鰗鯵鯵盡鰠鯵鰯鰊
0WNN鱃蓕ⓨ鰜秷鱀鰛鯵鱻鲑鱔鲍鲂
鯽㎋鯵鱄鰘鰊猳猳

9. 0WNN鰠㎋鰀鰛鯵鱄鰘鰊
0WNN鰑鰔鰗鯵鯵盡鰠鯵鰯鰊
0WNN鱃蓕ⓨ鰜秷鱀鰛鯵鱻鲑鱔鲍鲂
鯽㎋鯵鱄鰘鰊猳猳 鱻鲑鱔鲍鲄峡嵿

10. 瓹㣆鰠鰎鯷鯵鰔鰐嵒鱃鰈鰹鯷鰙㋾鯵鰯鰊

11. 啓鱄鰛峡嵿鰘
0WNN鰈鰒鰴鯻鯷
∇
0WNN鰛鰟鰠鯵鰂鰛鯵鰙㋾鯵鰯鰊猳

12. 哋ヒ倚↬
痓┮獌鰄鰇鰂ֺ鰈鱄鯵鰒
VYKVVGT獌UAMQCMG
鯻撲鯽PWNN鰛鰟鰠鯵鰂鰛鯵鰙㋾鯵鰯鰊猳

13. 鰎鰽鰏鰽鰟峡嵿鰘0WNN

14. ,CXC

15. 伂☹鰜0WNN鰘鯾鰼

17. ⃷鰟ℎ鰜鰠盎窚鰜PWNN鱃⑆鰽鰼㎋
鯵鱻鲑鱔鲍鲂鯽鯵鰯鰊珯
鰒鰴鱄鰙鱥鱋鱧鱓鰈鰯鰈鰸鯷猳

18. )TQQX[

19. 0WNN鰘鰳鯵鯵鰟鰹
∇

20. 盎窚痓鰙鲅鲗鱴痓鰟桴鰜!鱃⑆鰽鰼鰙碨畷鰜
鲅鲗鱴餿䑈鯽鰘鯾鰯鰊珯
鰄鰟⬕⛩鰠PWNN鯽孉䰛鰆鰽鰯鰊珯

21. 鲅鱡鱧鱭鱥鱋鯮鲗鰛鰚鰘⊠┊鰛筸聚鰘鰊鯽珮㎋
鯵0WNN鯽詅鯽鰔鰗鰈鰯鯵鰯鰊珯
鱕鯮鱝鰜㊽鰉鰗蓕ⓨ鰜PWNN鱥鱋鱧鱓鰈鰯鰈鰸鯷珯
PWNN鰛鰟鰠鯵鰂鰛鯵鰙㋾鯵鰯鰊猳

22. 5ECNC

23. 0WNN鰠
鱤鲅鰹～珮鱤鲅鱤鲅～

24. 0WNN鰟⛐聚㌈鯽鯳鰼⬕⛩鰠1RVKQP鰘鰎鰟⛐聚㌈鱃
㡨聣鰙鰈鰯鰊珯
鱵鱣鯮鲗鲂鱧鱥鰘02'鱃稢楅鰘鯾鰯鰊珯

25. ⃷鰟ℎ鰜鰠㎋鯵鱻鲑鱔鲍鲂鰳
鯵鰯鰊珯

26. 鰒鰛鰰鰜,CXC鯼鰺鰠,CXC鰜鰳
1RVKQPCN鯽䠉㏰鰆鰽鰗鯵鰯鰊珯

27. -QVNKP

28. 0WNN鰛鰟鰠鯵鰂鰛鯵
鰙㋾鯵鰯鰊猳

29. 蒌ㄙ鰟⩬⺄峡鱃鰈鰐⬕⛩珮鰎鰟盎窚鰠虳07..⩬
鰜鰛鰻鰯鰊珯07..N崒⺚⩬鱃⺄峡鰊鰼⬕⛩鰠⩬痓
鰟祱鰾鰜!鱃鰕鰂鰯鰊珯
虳07..⩬鰩鰟PWNN⇄⑆鰠鱗鲗鱵鱈鲏鱌鲍鯮鰜鰛鰻
鰯鰊珯

30. 02'鰟⛐聚㌈鯽鯳鰼鲅鲗鱴餿䑈鰠ⓛ来鰯鰌鱄猳
鱗鲗鱵鱈鲏鱌鲍鯮鰙鰛鰻鰯鰊珯

31. 0WNN鱥鱋鱧鱓鰈鰐鰺❝鰤ⓛ鰌鰯鰊猳
ρ鰐鰑鰈珮XCN猺鱈鲃鲉鯮鱣鱺鲏盎窚猻鰜椱鰼

32. )TQQX[鰟鰹鯷鰛碨畷❝鰤ⓛ鰈鰳ⓛ来鰯鰊猳

33. 鱃鰕鰂鰗❝鰤ⓛ鰊鰙02'鰘鯾鰒鰴鯵鰯鰊猳
∇

34. /QTG+PHQOCVKQP猳
JVVRUUKVGUIQQINGEQOUKVGVCTQMQVNKPEJCRUGE

35. 鰯鰙鰲

36. ֺ0WNN鯽㎋鯵鰟鰘鰠鯳鰻鰯鰌鱄
ֺ0WNN鱃蓕ⓨ鰜秷鯹鰼↶倥鰰鯽鰛鯵鰟鯽
ֺ㎋鯵鰟鰘鰊珯

37. 竐葎鰟峡嵿鰜鰠0WNN鱃碨畷鰜秷鯷↶倥鰰鯽
峡嵿㳺䅷鰙鰈鰗䠉㏰鰆鰽鰗鯵鰯鰊珯
ֺֺ
ֺ・0WNN1DLGEV
ֺ・1RVKQP鲆鱮鱭
ֺ・碨畷❝鰤ⓛ鰈
ֺ・虳0WNN⩬
ֺ・0WNN崒⺚⩬

38. -QVNKP鰠䛟飢䥥鰜0WNN鱃碨畷鰜秷鯹鰼峡嵿鰘鰊猳
!
-QVNKP鯼鱀鯵鯵鰹猳猳

39. 鰅䃦翮
鯳鰻鯽鰙鯷
鰅鰇鯵鰯鰈鰐猳猳