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Scala variable
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Scala variable
1.
Scala 覲 危危蠍 myjlms99@gmail.com
2.
襴磯,
3.
Literal , 覓語, ろ
れ 覦襦 一危 れ梗 企 讌 螳 企る 襴磯企 覦襦 螳
4.
expression 襴磯願骸 一一 煙
襦 覓苦 蟆郁骸螳 企 朱 蟆 螳螳 覃 螳 襴磯企 覦 .
5.
Expression block 觚襦
譴 伎 貊襯 譴蟯 brace( { } )襦 覓苦伎 豌襴. 觚襦 襷讌襷 覦伎 螳 豌襴 .
6.
覲仰
7.
Variable 覲企伎 轟
螳 轟 ろ伎れ 蟯襴 val 覲 : = var 覲 : =
8.
val襦 覲 讌 朱
覲 覲覈螻 螻 螳 麹伎 .
9.
var襦 覲 讌 var襦
覲襯 覲覈螻 螻 螳 麹伎 .
10.
覲 覈覈 蠏豺
11.
覈覈 蠏豺 覈覈蠏豺
蟯 豌蠍襯 覓語 覓語襦 讌螻 覯讌 企 豺企 蠍 覯 . 覲 覓語覿 蟯襦 覿 覓語覿 企, object, trait 覓語覿 .
12.
覲 覈覈 蠏豺
1 豌覯讌語 覓伎^蟇 覓語螳 . 覓語 れ 覓願 蟇磯 伎 覓語 螳 る磯殊
13.
覲 覈覈 蠏豺
2 覓語, , 蠍壱碁ゼ 譟壱 蠏豺 讌 襷 譴螳 碁れ企 蟲覿 譴 . 覓語 れ 覓語,, 蠍壱瑚 り 碁れ(_)襯 覿願 れ 覓語,, 蠍壱瑚 .
14.
覲 覈覈 蠏豺
3 一郁鍵碁 譟壱伎 覲襦 讌 . 蠏 伎 一 蠍壱
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覲 覈覈 蠏豺
4 れ 蠍一ヾ 企 覲襦 讌 蠏 伎 覓語襯 語覿(backquote `)襦
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讌 蠏豺
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Type 一危一 譬襯襦
一危一 覿 襯襯 覩誤覃 覈 一危磯 轟 覃 一危磯ゼ 豌襴 企るゼ 螳讌螻 . val 覲覈 れ 讌.
18.
誤蠍 覲螳 襷れ伎覃
企 れ伎 讌 襯 誤蠍 伎 getClass 覃襦 .
19.
企る trait襦
讌 企る trait襯 覲覈 れ 讌伎 .
20.
Trait螳 る trait螳
螻 蟇磯 trait襯 伎 給 螳豌企ゼ 襷る .
21.
Object . object
炎 語ろ伎れ企襦 .
22.
讌蠍
23.
讌
蠏豺 蠏碁豌 襷 螳 讌螻 . ( 襷り覲 ) => 蟆郁骸螳
24.
覲 麹
. 襯 螻 覲 麹る 螻 蟆郁骸螳 狩伎 .
25.
語螻 覦螳
語螳 螻 覦螳 lambda 襯 覲 麹. 企ゼ ろ覃 lambda 螳 ろ.
26.
Assignments
27.
螳 覿 val襦
覃 覯 麹覃 轟 覿 螳. Var 伎 轟 伎 . 豪 狩 蟆曙 轟 .
28.
覲襯 覯
覲襯 讌 蟯碁ゼ 伎 覓 螻 一危磯 蟯碁 覓苦伎 覲企伎朱 .
29.
豢襦 /
30.
覲 讌
豢襦 豌危蠍 伎 覲 伎 讌襷 覲 螳 覲願 豢襦 蠍磯 讌 伎 螳 覲願 . 豌危覩襦 豢襦 伎 覲蟆曙 覿螳.
31.
レ : upconverted
一危 蟆曙磯 るジ 企 讌 蟆曙磯 朱 覲 .
32.
レ : downconverted
一危 レ 讌襷 朱 讌 蟆 覲 .
33.
Scope
34.
覲 蟯襴蠍一 れ梗 覲
豺 磯 螳讌 覯 襦 覿襯. 矧, 覃 襷り 覲 覦 襦貉 覲 . 磯Μ螳 願れ 襦. 矧 覃() 襷り覲 襦貉 覲 企れ 蟲譟一 磯ジ 覲 れ ろ伎るゼ 蟲燕. 襦貉覲 襷り覲 覲 れ 伎るゼ 蟲燕.
35.
矧 field 企, 螳豌,
trait 煙 碁 覲襯 襷覃 ′語 磯 螳豌伎 覈 覃 螳豌 碁 ′語 螻, var 覦 val れ 磯 覲蟆 螳 ロ蟇磯 覲蟆 覿螳ロ . 企れ 蠍磯蓋 public企
36.
覃 襷り覲 :
覃 覃螳 語 襷 覃 企 螳 覲
37.
覃 襷り覲 :
企 朱 企るゼ 襷り覲 覦襦 蠏狩伎 . れ梗 企る 襷 螳覲襦 螳 螳 ロ螻 企ゼ 企 覃 覦襦 蠏 螳
38.
襦貉 襷り覲 讌 覲
, 覃 企 覲. 覃 伎襷 蠏 . var 覦 val れ襯 , 覃 伎 覲 覿 谿語^螳 讌 .
39.
襷り覲襯 襦貉覲襦 讌 襷り覲
企朱 襦貉覲襦 讌覃 螳 覦. 狩 企 豌危 襯 伎 襯 覿螳蟆 .
40.
覲 螳 蠍一
41.
讌 螳 lazy val襦
覲襯 螻 觚襦朱 螳 麹覃 轟 螻 覲襯 豢 れ 螳 豪 蟆 . 覯 語覃 狩 螳 螳讌螻 豌襴.
42.
讀 螳/讌 螳 var
val 襦 覲 讀 螳 覲螳 . Lazy れ襯 伎覃 語 螳. Lazy襦 讌 蟆 object 螳 ろ れ 螳 螳讌 .
43.
矧 蠏
44.
private 讌蠍 企る object
伎襷 矧 襯 襷り鍵 矧 private . private朱 覃 碁 蠏狩 .
45.
private[this] 蠍 1 狩
螳豌伎襷 蠏狩伎 蠍 伎 private[this]襯 覃 るジ 語 伎れ 讌 蠏狩 .
46.
private[this] 蠍 2 るジ
語ろ伎れ 矧襯 蠏狩蠍 覲 矧襯 蠏狩 覃螳 .
47.
豢 矧/ 蟲
矧
48.
豢矧 trait 豢企れ 豢
矧襯 讌 . 企ゼ 蟲 企れ 蟲 企 る 伎 . Trait 矧 蟾讌襷 覃 豢矧螳 .
49.
伎 螻豸
蟲譟
50.
螻豸 蟲譟 豕
蟲譟一 豕 蟲譟郁 .
51.
豕 螻豸旧
覲 讌 蟆 螻 蠏 語ろ伎るゼ 麹覃 豌襴 蟲譟磯ゼ 襷.
52.
伎 覲
53.
伎 覲 伎
企るれ 覿覿 伎 朱 覃襯 螻牛.
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