{"id":123967,"date":"2026-11-08T15:01:25","date_gmt":"2026-11-08T07:01:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123967.html"},"modified":"2026-11-08T15:01:25","modified_gmt":"2026-11-08T07:01:25","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3scala%e5%8c%bf%e5%90%8d%e5%87%bd%e6%95%b0%ef%bc%9a%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%9f%ba%e7%9f%b3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123967.html","title":{"rendered":"\u6df1\u5165\u7406\u89e3Scala\u533f\u540d\u51fd\u6570\uff1a\u51fd\u6570\u5f0f\u7f16\u7a0b\u57fa\u77f3"},"content":{"rendered":"

Java 8\u4e4b\u524d\u4f60\u5199\u56de\u8c03，\u5f97\u8fd9\u4e48\u5199：<\/p>\n

\/\/ Java 8\u4e4b\u524d：\u533f\u540d\u5185\u90e8\u7c7b<\/span>
\nbutton.<\/span>setOnClickListener<\/span>(<\/span>new<\/span> OnClickListener<\/span>(<\/span>)<\/span> {<\/span>
\n @Override<\/span>
\n public<\/span> void<\/span> onClick<\/span>(<\/span>View<\/span> v)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"clicked"<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

\u56db\u884c\u4ee3\u7801，\u5c31\u4e3a\u4e86\u4f20\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u3002\u8fd9\u5c31\u662fJava\u65e9\u671f\u7684"\u533f\u540d\u51fd\u6570"\u2014\u2014\u533f\u540d\u5185\u90e8\u7c7b\u3002<\/p>\n

Java 8\u4e4b\u540e\u5462？<\/p>\n

\/\/ Java 8：Lambda<\/span>
\nbutton.<\/span>setOnClickListener<\/span>(<\/span>v -><\/span> System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"clicked"<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\u4e00\u884c\u641e\u5b9a\u3002<\/p>\n

Scala\u5462？Scala\u4ece\u7b2c\u4e00\u5929\u5c31\u6709\u533f\u540d\u51fd\u6570\u2014\u2014\u800c\u4e14\u5b83\u7684\u533f\u540d\u51fd\u6570\u6bd4Java\u7684Lambda\u66f4\u5f7b\u5e95\u3001\u66f4\u7075\u6d3b\u3002<\/p>\n

\/\/ Scala：\u533f\u540d\u51fd\u6570<\/span>
\nval<\/span> add =<\/span> (<\/span>a:<\/span> Int<\/span>,<\/span> b:<\/span> Int<\/span>)<\/span> =><\/span> a +<\/span> b
\nadd(<\/span>1<\/span>,<\/span> 2<\/span>)<\/span> \/\/ 3<\/span><\/p>\n

\/\/ \u7528\u5728\u96c6\u5408\u64cd\u4f5c\u91cc<\/span>
\nList(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>map(<\/span>x =><\/span> x *<\/span> 2<\/span>)<\/span> \/\/ List(2, 4, 6)<\/span>
\nList(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>filter(<\/span>x =><\/span> x ><\/span> 1<\/span>)<\/span> \/\/ List(2, 3)<\/span><\/p>\n

\u8fd9\u7bc7\u6587\u7ae0\u4e0d\u8bb2"\u533f\u540d\u51fd\u6570\u662f\u4ec0\u4e48"\u8fd9\u79cd\u5165\u95e8\u5e9f\u8bdd，\u76f4\u63a5\u8bf4\u5e72\u8d27：Scala\u7684\u533f\u540d\u51fd\u6570\u5e95\u5c42\u662f\u4ec0\u4e48？\u5b83\u548cJava\u7684Lambda\u6bd4\u597d\u5728\u54ea？\u95ed\u5305\u5230\u5e95\u662f\u600e\u4e48\u6355\u83b7\u53d8\u91cf\u7684？\u6709\u4ec0\u4e48\u5751？<\/p>\n

\"Scala\u533f\u540d\u51fd\u6570\u77e5\u8bc6\u4f53\u7cfb\"<\/p>\n

\n

\u5148\u4ece\u4e00\u4e2a\u75db\u70b9\u8bf4\u8d77<\/h3>\n

Java 8\u4e4b\u524d，\u4f60\u60f3\u628a\u51fd\u6570\u5f53\u53c2\u6570\u4f20\u600e\u4e48\u529e？\u7b54\u6848\u662f：\u4f20\u4e00\u4e2a\u63a5\u53e3\u7684\u5b9e\u73b0\u3002<\/p>\n

\/\/ Java：\u7528\u63a5\u53e3\u5b9e\u73b0"\u51fd\u6570\u5f53\u53c2\u6570"<\/span>
\ninterface<\/span> Calculator<\/span> {<\/span>
\n int<\/span> calculate<\/span>(<\/span>int<\/span> a,<\/span> int<\/span> b)<\/span>;<\/span>
\n}<\/span><\/p>\n

public<\/span> int<\/span> compute<\/span>(<\/span>int<\/span> a,<\/span> int<\/span> b,<\/span> Calculator<\/span> calc)<\/span> {<\/span>
\n return<\/span> calc.<\/span>calculate<\/span>(<\/span>a,<\/span> b)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u8c03\u7528：\u4f20\u4e00\u4e2a\u533f\u540d\u5185\u90e8\u7c7b<\/span>
\ncompute<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> new<\/span> Calculator<\/span>(<\/span>)<\/span> {<\/span>
\n @Override<\/span>
\n public<\/span> int<\/span> calculate<\/span>(<\/span>int<\/span> a,<\/span> int<\/span> b)<\/span> {<\/span>
\n return<\/span> a +<\/span> b;<\/span>
\n }<\/span>
\n}<\/span>)<\/span>;<\/span><\/p>\n

\u8fd9\u5c31\u662fJava\u65e9\u671f\u7684"\u51fd\u6570\u5f0f\u7f16\u7a0b"\u2014\u2014\u4f60\u5f97\u5148\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3，\u518d\u5199\u4e00\u4e2a\u533f\u540d\u5185\u90e8\u7c7b，\u624d\u80fd\u628a\u51fd\u6570\u5f53\u53c2\u6570\u4f20\u3002\u5570\u55e6，\u7e41\u7410，\u4f46\u6ca1\u529e\u6cd5\u2014\u2014\u56e0\u4e3aJava\u662f\u9762\u5411\u5bf9\u8c61\u8bed\u8a00，\u4e00\u5207\u7686\u5bf9\u8c61，\u51fd\u6570\u4e0d\u662f\u4e00\u7b49\u516c\u6c11\u3002<\/p>\n

Scala\u5462？Scala\u4ece\u7b2c\u4e00\u5929\u5c31\u628a\u51fd\u6570\u5f53\u4e00\u7b49\u516c\u6c11\u2014\u2014\u4f60\u53ef\u4ee5\u628a\u51fd\u6570\u8d4b\u503c\u7ed9\u53d8\u91cf\u3001\u5f53\u53c2\u6570\u4f20\u3001\u5f53\u8fd4\u56de\u503c\u8fd4\u56de\u3002<\/p>\n

\/\/ Scala：\u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11<\/span>
\nval<\/span> add =<\/span> (<\/span>a:<\/span> Int<\/span>,<\/span> b:<\/span> Int<\/span>)<\/span> =><\/span> a +<\/span> b \/\/ \u51fd\u6570\u8d4b\u503c\u7ed9\u53d8\u91cf<\/span>
\nval<\/span> result =<\/span> compute(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> add)<\/span> \/\/ \u51fd\u6570\u5f53\u53c2\u6570\u4f20<\/span><\/p>\n

def<\/span> compute(<\/span>a:<\/span> Int<\/span>,<\/span> b:<\/span> Int<\/span>,<\/span> f:<\/span> (<\/span>Int<\/span>,<\/span> Int<\/span>)<\/span> =><\/span> Int<\/span>)<\/span>:<\/span> Int<\/span> =<\/span> {<\/span>
\n f(<\/span>a,<\/span> b)<\/span>
\n}<\/span><\/p>\n

\u6ca1\u6709\u63a5\u53e3，\u6ca1\u6709\u533f\u540d\u5185\u90e8\u7c7b\u2014\u2014\u4e00\u884c=>\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n

\u8fd9\u5c31\u662fScala\u533f\u540d\u51fd\u6570\u548cJava\u533f\u540d\u5185\u90e8\u7c7b\u7684\u672c\u8d28\u533a\u522b：Java\u7684\u533f\u540d\u51fd\u6570\u662f"\u5bf9\u8c61\u7684\u8bed\u6cd5\u7cd6"，Scala\u7684\u533f\u540d\u51fd\u6570\u662f"\u51fd\u6570\u7684\u8bed\u6cd5\u7cd6"\u3002<\/p>\n

\n

\u533f\u540d\u51fd\u6570\u7684\u672c\u8d28：\u5b83\u662f\u4e00\u4e2aFunctionN\u5bf9\u8c61<\/h3>\n

\u5f88\u591a\u4eba\u4ee5\u4e3aScala\u7684\u533f\u540d\u51fd\u6570\u5c31\u662f\u4e2a\u8bed\u6cd5\u7cd6\u2014\u2014\u4f60\u5199(a: Int) => a * 2，\u7f16\u8bd1\u5668\u5e2e\u4f60\u751f\u6210\u4e00\u4e2a\u7c7b\u3002<\/p>\n

\u5bf9，\u4f46\u4e0d\u5b8c\u6574\u3002<\/p>\n

val<\/span> double =<\/span> (<\/span>a:<\/span> Int<\/span>)<\/span> =><\/span> a *<\/span> 2<\/span><\/p>\n

\u8fd9\u884c\u4ee3\u7801\u5728\u5e95\u5c42\u751f\u6210\u4e86\u4ec0\u4e48？\u2014\u2014\u4e00\u4e2aFunction1[Int, Int]\u7684\u5b9e\u4f8b\u3002<\/p>\n

\/\/ \u7f16\u8bd1\u5668\u5e2e\u4f60\u751f\u6210\u7684\u4ee3\u7801，\u5927\u6982\u957f\u8fd9\u6837<\/span>
\nval<\/span> double =<\/span> new<\/span> Function1[<\/span>Int<\/span>,<\/span> Int<\/span>]<\/span> {<\/span>
\n override<\/span> def<\/span> apply(<\/span>a:<\/span> Int<\/span>)<\/span>:<\/span> Int<\/span> =<\/span> a *<\/span> 2<\/span>
\n}<\/span><\/p>\n

double(<\/span>5<\/span>)<\/span> \/\/ 10\u2014\u2014\u56e0\u4e3a\u6709apply\u65b9\u6cd5，\u6240\u4ee5\u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u8c03\u7528<\/span><\/p>\n

\u770b\u5230\u4e86\u5417？Scala\u7684\u533f\u540d\u51fd\u6570\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u5b9e\u73b0\u4e86FunctionN\u63a5\u53e3\u7684\u5bf9\u8c61\u3002\u4f60\u6709\u51e0\u4e2a\u53c2\u6570，\u5b83\u5c31\u662fFunction1\u3001Function2\u3001Function3\u2026\u2026\u4e00\u76f4\u5230Function22\u3002<\/p>\n

\/\/ \u4e00\u4e2a\u53c2\u6570 \u2192 Function1<\/span>
\nval<\/span> f1 =<\/span> (<\/span>x:<\/span> Int<\/span>)<\/span> =><\/span> x +<\/span> 1<\/span><\/p>\n

\/\/ \u4e24\u4e2a\u53c2\u6570 \u2192 Function2<\/span>
\nval<\/span> f2 =<\/span> (<\/span>x:<\/span> Int<\/span>,<\/span> y:<\/span> Int<\/span>)<\/span> =><\/span> x +<\/span> y<\/p>\n

\/\/ \u4e09\u4e2a\u53c2\u6570 \u2192 Function3<\/span>
\nval<\/span> f3 =<\/span> (<\/span>x:<\/span> Int<\/span>,<\/span> y:<\/span> Int<\/span>,<\/span> z:<\/span> Int<\/span>)<\/span> =><\/span> x +<\/span> y +<\/span> z<\/p>\n

Scala\u6700\u591a\u652f\u630122\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u2014\u2014\u56e0\u4e3a\u6807\u51c6\u5e93\u53ea\u5b9a\u4e49\u4e86Function1\u5230Function22\u3002<\/p>\n

\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48Scala\u7684\u533f\u540d\u51fd\u6570\u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u8c03\u7528\u2014\u2014\u56e0\u4e3a\u5b83\u662f\u4e00\u4e2a\u5bf9\u8c61，\u4f46\u5b83\u6709apply\u65b9\u6cd5，\u6240\u4ee5\u4f60\u53ef\u4ee5obj(args)\u8fd9\u6837\u8c03\u7528\u3002<\/p>\n

\n

\u95ed\u5305：\u533f\u540d\u51fd\u6570\u6700\u5f3a\u5927\u7684\u5730\u65b9<\/h3>\n

\u533f\u540d\u51fd\u6570\u6700\u795e\u5947\u7684\u80fd\u529b\u662f\u4ec0\u4e48？\u2014\u2014\u5b83\u53ef\u4ee5\u6355\u83b7\u5916\u90e8\u53d8\u91cf\u3002<\/p>\n

var<\/span> multiplier =<\/span> 2<\/span><\/p>\n

val<\/span> multiply =<\/span> (<\/span>x:<\/span> Int<\/span>)<\/span> =><\/span> x *<\/span> multiplier
\nmultiply(<\/span>5<\/span>)<\/span> \/\/ 10<\/span><\/p>\n

multiplier =<\/span> 3<\/span>
\nmultiply(<\/span>5<\/span>)<\/span> \/\/ 15\u2014\u2014\u6ce8\u610f！\u8fd9\u91cc\u53d8\u4e86！<\/span><\/p>\n

\u770b\u5230\u4e86\u5417？multiply\u8fd9\u4e2a\u51fd\u6570，\u6355\u83b7\u4e86\u5916\u90e8\u53d8\u91cfmultiplier\u3002\u5f53multiplier\u53d8\u4e86，\u51fd\u6570\u7684\u884c\u4e3a\u4e5f\u53d8\u4e86\u3002<\/p>\n

\u8fd9\u5c31\u662f\u95ed\u5305\u3002<\/p>\n

\u95ed\u5305 = \u51fd\u6570 + \u5b83\u6355\u83b7\u7684\u73af\u5883\u3002<\/p>\n

Java\u7684\u533f\u540d\u5185\u90e8\u7c7b\u4e5f\u80fd\u6355\u83b7\u53d8\u91cf\u2014\u2014\u4f46\u5b83\u6709\u4e00\u4e2a\u9650\u5236：\u4f60\u53ea\u80fd\u6355\u83b7final\u6216\u7b49\u6548final\u7684\u53d8\u91cf\u3002\u4f60\u4e0d\u80fd\u5728\u533f\u540d\u5185\u90e8\u7c7b\u91cc\u4fee\u6539\u5916\u90e8\u53d8\u91cf\u3002<\/p>\n

\/\/ Java：\u533f\u540d\u5185\u90e8\u7c7b\u53ea\u80fd\u6355\u83b7final\u53d8\u91cf<\/span>
\nint<\/span> multiplier =<\/span> 2<\/span>;<\/span><\/p>\n

Runnable<\/span> r =<\/span> (<\/span>)<\/span> -><\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>multiplier *<\/span> 5<\/span>)<\/span>;<\/span>
\n \/\/ multiplier = 3; \/\/ \u7f16\u8bd1\u62a5\u9519！\u4e0d\u80fd\u4fee\u6539\u5916\u90e8\u53d8\u91cf<\/span>
\n}<\/span>;<\/span><\/p>\n

Scala\u5462？Scala\u7684\u95ed\u5305\u53ef\u4ee5\u6355\u83b7\u53d8\u91cf，\u751a\u81f3\u53ef\u4ee5\u4fee\u6539\u53d8\u91cf\u3002<\/p>\n

var<\/span> count =<\/span> 0<\/span><\/p>\n

val<\/span> increment =<\/span> (<\/span>)<\/span> =><\/span> {<\/span>
\n count +=<\/span> 1<\/span>
\n println(<\/span>s<\/span>"count = <\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>)<\/span>
\n}<\/span><\/p>\n

increment(<\/span>)<\/span> \/\/ count = 1<\/span>
\nincrement(<\/span>)<\/span> \/\/ count = 2<\/span>
\nincrement(<\/span>)<\/span> \/\/ count = 3<\/span><\/p>\n

\u4e3a\u4ec0\u4e48Scala\u80fd\u505a\u5230？\u56e0\u4e3aScala\u7684\u95ed\u5305\u6355\u83b7\u7684\u4e0d\u662f\u53d8\u91cf\u7684\u503c\u2014\u2014\u800c\u662f\u53d8\u91cf\u672c\u8eab\u3002\u5b83\u6355\u83b7\u7684\u662f\u4e00\u4e2a\u5f15\u7528，\u901a\u8fc7\u8fd9\u4e2a\u5f15\u7528\u53ef\u4ee5\u8bfb\u5199\u5916\u90e8\u53d8\u91cf\u3002<\/p>\n

Java\u7684\u95ed\u5305\u662f"\u503c\u6355\u83b7"\u2014\u2014\u4f60\u6355\u83b7\u7684\u662f\u53d8\u91cf\u7684\u503c，\u4e0d\u80fd\u6539\u3002Scala\u7684\u95ed\u5305\u662f"\u53d8\u91cf\u6355\u83b7"\u2014\u2014\u4f60\u6355\u83b7\u7684\u662f\u53d8\u91cf\u672c\u8eab，\u53ef\u4ee5\u8bfb\u5199\u3002<\/p>\n

\u8fd9\u5c31\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u547d\u4ee4\u5f0f\u7f16\u7a0b\u7684\u533a\u522b\u2014\u2014\u51fd\u6570\u5f0f\u8bed\u8a00\u628a\u51fd\u6570\u5f53\u4e00\u7b49\u516c\u6c11，\u6240\u4ee5\u5b83\u7684\u95ed\u5305\u4e5f\u662f\u5b8c\u6574\u7684\u95ed\u5305\u3002<\/p>\n

\n

\u51e0\u4e2a\u5e38\u89c1\u7684\u7b80\u5199<\/h3>\n

Scala\u7684\u533f\u540d\u51fd\u6570\u6709\u5f88\u591a\u7b80\u5199\u8bed\u6cd5，\u5199\u8d77\u6765\u975e\u5e38\u723d\u3002<\/p>\n

1. \u4e0b\u5212\u7ebf\u5360\u4f4d\u7b26<\/h4>\n

List(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>map(<\/span>_ *<\/span> 2<\/span>)<\/span> \/\/ List(2, 4, 6)<\/span>
\nList(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>filter(<\/span>_ ><\/span> 1<\/span>)<\/span> \/\/ List(2, 3)<\/span>
\nList(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>reduce(<\/span>_ +<\/span> _)<\/span> \/\/ 6<\/span><\/p>\n

_\u5c31\u662f"\u8fd9\u4e2a\u53c2\u6570"\u7684\u5360\u4f4d\u7b26\u3002\u5982\u679c\u51fd\u6570\u53ea\u6709\u4e00\u4e2a\u53c2\u6570，\u4f60\u53ef\u4ee5\u7528_\u4ee3\u66ff\u53c2\u6570\u540d\u3002<\/p>\n

2. \u7c7b\u578b\u63a8\u65ad<\/h4>\n

\/\/ \u4e0d\u7528\u5199\u53c2\u6570\u7c7b\u578b\u2014\u2014\u7f16\u8bd1\u5668\u5e2e\u4f60\u63a8\u65ad<\/span>
\nList(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>map(<\/span>x =><\/span> x *<\/span> 2<\/span>)<\/span><\/p>\n

\/\/ \u7528\u4e0b\u5212\u7ebf\u66f4\u7b80\u6d01<\/span>
\nList(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>.<\/span>map(<\/span>_ *<\/span> 2<\/span>)<\/span><\/p>\n

Scala\u7684\u7c7b\u578b\u63a8\u65ad\u4f1a\u6839\u636e\u4e0a\u4e0b\u6587\u63a8\u65ad\u53c2\u6570\u7c7b\u578b\u2014\u2014List[Int].map\u7684\u53c2\u6570\u80af\u5b9a\u662fInt，\u6240\u4ee5\u4f60\u4e0d\u7528\u5199\u3002<\/p>\n

3. \u591a\u53c2\u6570\u51fd\u6570<\/h4>\n

\/\/ \u4e24\u4e2a\u53c2\u6570\u7684\u51fd\u6570<\/span>
\nval<\/span> add =<\/span> (<\/span>_:<\/span> Int<\/span>)<\/span> +<\/span> (<\/span>_:<\/span> Int<\/span>)<\/span>
\nadd(<\/span>1<\/span>,<\/span> 2<\/span>)<\/span> \/\/ 3<\/span><\/p>\n

\u6bcf\u4e2a_\u4ee3\u8868\u4e00\u4e2a\u53c2\u6570\u2014\u2014\u7b2c\u4e00\u4e2a_\u662f\u7b2c\u4e00\u4e2a\u53c2\u6570，\u7b2c\u4e8c\u4e2a_\u662f\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002<\/p>\n

\n

\u51e0\u4e2a\u5e38\u89c1\u7684\u5751<\/h3>\n

\u57511：\u95ed\u5305\u6355\u83b7\u7684\u662f\u53d8\u91cf，\u4e0d\u662f\u503c<\/h4>\n

var<\/span> total =<\/span> 0<\/span><\/p>\n

val<\/span> addToTotal =<\/span> (<\/span>x:<\/span> Int<\/span>)<\/span> =><\/span> total +=<\/span> x<\/p>\n

addToTotal(<\/span>10<\/span>)<\/span>
\naddToTotal(<\/span>20<\/span>)<\/span>
\nprintln(<\/span>total)<\/span> \/\/ 30<\/span><\/p>\n

\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u5199\u95ed\u5305\u7684\u65f6\u5019，\u4ee5\u4e3a\u95ed\u5305\u6355\u83b7\u7684\u662f\u53d8\u91cf\u7684\u503c\u3002\u4f46\u5b9e\u9645\u4e0a，\u95ed\u5305\u6355\u83b7\u7684\u662f\u53d8\u91cf\u672c\u8eab\u2014\u2014\u5b83\u662f\u4e00\u4e2a\u5f15\u7528，\u6307\u5411\u90a3\u4e2a\u53d8\u91cf\u3002<\/p>\n

\u6240\u4ee5\u5f53\u4f60\u4fee\u6539\u53d8\u91cf\u7684\u65f6\u5019，\u6240\u6709\u95ed\u5305\u770b\u5230\u7684\u503c\u90fd\u53d8\u4e86\u3002<\/p>\n

\u8fd9\u4e2a\u7279\u6027\u6709\u65f6\u5019\u4f1a\u5bfc\u81f4\u610f\u5916\u2014\u2014\u6bd4\u5982\u4f60\u5728\u5faa\u73af\u91cc\u521b\u5efa\u95ed\u5305：<\/p>\n

\/\/ \u8fd9\u4e2a\u4f1a\u51fa\u95ee\u9898<\/span>
\nval<\/span> functions =<\/span> (<\/span>1<\/span> to 3<\/span>)<\/span>.<\/span>map {<\/span> i =><\/span>
\n (<\/span>)<\/span> =><\/span> i
\n}<\/span><\/p>\n

functions.<\/span>foreach(<\/span>f =><\/span> println(<\/span>f(<\/span>)<\/span>)<\/span>)<\/span>
\n\/\/ \u4f60\u4ee5\u4e3a\u8f93\u51fa 1 2 3？<\/span>
\n\/\/ \u5b9e\u9645\u4e0a\u8f93\u51fa\u4ec0\u4e48？<\/span><\/p>\n

\u8fd9\u4e2a\u95ee\u9898\u5728Java\u548cJavaScript\u91cc\u90fd\u6709\u2014\u2014\u56e0\u4e3a\u95ed\u5305\u6355\u83b7\u7684\u662f\u53d8\u91cf\u672c\u8eab，\u4e0d\u662f\u53d8\u91cf\u7684\u503c\u3002Scala\u4e5f\u4e00\u6837\u3002<\/p>\n

\u57512：\u5e8f\u5217\u5316\u95ee\u9898<\/h4>\n

\u8fd9\u4e2a\u662f\u5927\u6570\u636e\u5f00\u53d1\u91cc\u6700\u5e38\u89c1\u7684\u5751\u2014\u2014Flink\/Spark\u91cc\u7528Scala\u533f\u540d\u51fd\u6570，\u6709\u65f6\u5019\u4f1a\u62a5\u5e8f\u5217\u5316\u9519\u8bef\u3002<\/p>\n

\u4e3a\u4ec0\u4e48？\u56e0\u4e3aScala\u7684\u533f\u540d\u51fd\u6570\u662f\u4e00\u4e2a\u5bf9\u8c61\u2014\u2014\u5b83\u5b9e\u73b0\u4e86FunctionN\u63a5\u53e3\u3002\u5982\u679c\u4f60\u7528\u7684\u662f\u666e\u901a\u7684\u7c7b，\u5b83\u6ca1\u6709\u5b9e\u73b0Serializable，\u5e8f\u5217\u5316\u7684\u65f6\u5019\u5c31\u4f1a\u62a5\u9519\u3002<\/p>\n

\/\/ \u8fd9\u4e2a\u5728Flink\/Spark\u91cc\u4f1a\u62a5\u5e8f\u5217\u5316\u9519\u8bef<\/span>
\nval<\/span> data =<\/span> List(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>
\ndata.<\/span>map(<\/span>x =><\/span> x *<\/span> 2<\/span>)<\/span> \/\/ \u533f\u540d\u51fd\u6570\u6ca1\u6709\u5b9e\u73b0Serializable<\/span><\/p>\n

\u600e\u4e48\u89e3\u51b3？\u628a\u533f\u540d\u51fd\u6570\u63d0\u53d6\u6210\u4e00\u4e2a\u72ec\u7acb\u7684\u7c7b，\u6216\u8005\u7528lambda\u7684\u65b9\u5f0f\u3002<\/p>\n

\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48Flink\u5b98\u65b9\u6587\u6863\u91cc\u8bf4：JdbcSink\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e0d\u80fd\u7528Scala\u533f\u540d\u51fd\u6570\u5199，\u5426\u5219\u4f1a\u62a5\u5e8f\u5217\u5316\u9519\u8bef\u3002<\/p>\n

\u57513：\u51fd\u6570\u7684arity\u9650\u5236<\/h4>\n

Scala\u6700\u591a\u652f\u630122\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u2014\u2014\u56e0\u4e3a\u6807\u51c6\u5e93\u53ea\u5b9a\u4e49\u4e86Function1\u5230Function22\u3002<\/p>\n

\u5982\u679c\u4f60\u9700\u898123\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u600e\u4e48\u529e？\u2014\u2014\u628a\u591a\u4e2a\u53c2\u6570\u6253\u5305\u6210\u4e00\u4e2a\u5143\u7ec4，\u6216\u8005\u7528\u67ef\u91cc\u5316\u3002<\/p>\n

\n

\u4ec0\u4e48\u65f6\u5019\u7528\u533f\u540d\u51fd\u6570？<\/h3>\n

\u533f\u540d\u51fd\u6570\u6700\u9002\u5408\u7684\u573a\u666f\u5c31\u662f：\u51fd\u6570\u53ea\u5728\u4e00\u4e2a\u5730\u65b9\u7528，\u4e0d\u9700\u8981\u590d\u7528\u3002<\/p>\n

\u6bd4\u5982：<\/p>\n

\/\/ \u96c6\u5408\u64cd\u4f5c\u2014\u2014\u533f\u540d\u51fd\u6570\u7528\u4e00\u6b21\u5c31\u6254<\/span>
\nlist.<\/span>map(<\/span>_ *<\/span> 2<\/span>)<\/span>
\nlist.<\/span>filter(<\/span>_ ><\/span> 10<\/span>)<\/span>
\nlist.<\/span>reduce(<\/span>_ +<\/span> _)<\/span><\/p>\n

\/\/ \u56de\u8c03\u2014\u2014\u4f20\u4e00\u4e2a\u4e00\u6b21\u6027\u7684\u56de\u8c03<\/span>
\nbutton.<\/span>onClick(<\/span>(<\/span>)<\/span> =><\/span> println(<\/span>"clicked"<\/span>)<\/span>)<\/span><\/p>\n

\u4ec0\u4e48\u65f6\u5019\u4e0d\u7528？\u2014\u2014\u5982\u679c\u8fd9\u4e2a\u51fd\u6570\u4f60\u8981\u5728\u591a\u4e2a\u5730\u65b9\u590d\u7528，\u90a3\u5c31\u7ed9\u5b83\u8d77\u4e2a\u540d\u5b57，\u5b9a\u4e49\u6210\u547d\u540d\u51fd\u6570\u3002<\/p>\n

\/\/ \u590d\u7528\u7684\u51fd\u6570\u2014\u2014\u7528\u547d\u540d\u51fd\u6570<\/span>
\ndef<\/span> double(<\/span>x:<\/span> Int<\/span>)<\/span>:<\/span> Int<\/span> =<\/span> x *<\/span> 2<\/span><\/p>\n

list.<\/span>map(<\/span>double)<\/span>
\nlist.<\/span>filter(<\/span>double(<\/span>_)<\/span> ><\/span> 4<\/span>)<\/span><\/p>\n

\u7b80\u5355\u8bf4：\u4e00\u6b21\u6027\u7684\u64cd\u4f5c\u7528\u533f\u540d\u51fd\u6570，\u590d\u7528\u7684\u64cd\u4f5c\u7528\u547d\u540d\u51fd\u6570\u3002<\/p>\n

\n

\u5199\u5728\u6700\u540e<\/h3>\n

\u6211\u5199\u8fd9\u7bc7\u6587\u7ae0\u7684\u65f6\u5019，\u7279\u610f\u6ca1\u7f57\u5217\u533f\u540d\u51fd\u6570\u6709\u591a\u5c11\u79cd\u5199\u6cd5\u2014\u2014\u56e0\u4e3a\u5199\u6cd5\u5f88\u7b80\u5355，\u8c01\u90fd\u80fd\u5199\u3002<\/p>\n

\u771f\u6b63\u503c\u5f97\u82b1\u65f6\u95f4\u7406\u89e3\u7684\u662f：\u533f\u540d\u51fd\u6570\u4e3a\u4ec0\u4e48\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u57fa\u77f3？<\/p>\n

\u56e0\u4e3a\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6838\u5fc3\u601d\u60f3\u5c31\u662f：\u628a\u51fd\u6570\u5f53\u53c2\u6570\u4f20\u3002<\/p>\n

\u4f60\u4e0d\u80fd\u628a\u51fd\u6570\u5f53\u53c2\u6570\u4f20，\u5c31\u6ca1\u6709map\u3001filter\u3001reduce\u8fd9\u4e9b\u96c6\u5408\u64cd\u4f5c\u3002\u6ca1\u6709\u8fd9\u4e9b\u96c6\u5408\u64cd\u4f5c，\u5c31\u6ca1\u6709\u58f0\u660e\u5f0f\u7f16\u7a0b\u3002\u6ca1\u6709\u58f0\u660e\u5f0f\u7f16\u7a0b，\u5c31\u6ca1\u6709\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002<\/p>\n

Java\u82b1\u4e86\u5f88\u957f\u65f6\u95f4\u624d\u610f\u8bc6\u5230\u8fd9\u4e00\u70b9\u2014\u2014Java 8\u624d\u52a0\u4e86Lambda\u3002\u4f46Java\u7684Lambda\u662f\u4e0d\u5b8c\u6574\u7684\u2014\u2014\u5b83\u53ea\u80fd\u6355\u83b7final\u53d8\u91cf，\u4e0d\u80fd\u4fee\u6539\u53d8\u91cf\u3002\u5b83\u662f\u4e00\u4e2a"\u9609\u5272\u7248"\u7684\u95ed\u5305\u3002<\/p>\n

Scala\u5462？Scala\u4ece\u7b2c\u4e00\u5929\u5c31\u6709\u5b8c\u6574\u7684\u533f\u540d\u51fd\u6570\u548c\u95ed\u5305\u2014\u2014\u5b83\u53ef\u4ee5\u6355\u83b7\u53d8\u91cf，\u53ef\u4ee5\u4fee\u6539\u53d8\u91cf，\u53ef\u4ee5\u628a\u51fd\u6570\u5f53\u4e00\u7b49\u516c\u6c11\u3002<\/p>\n

\u533f\u540d\u51fd\u6570\u4e0d\u662f\u4e00\u4e2a"\u8bed\u6cd5\u7cd6"\u2014\u2014\u5b83\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u57fa\u77f3\u3002\u6ca1\u6709\u533f\u540d\u51fd\u6570，\u5c31\u6ca1\u6709\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002<\/p>\n

\u4f60\u5199\u7684\u4e0d\u662f\u4e00\u4e2a"\u6ca1\u6709\u540d\u5b57\u7684\u51fd\u6570"\u2014\u2014\u4f60\u5199\u7684\u662f\u4e00\u4e2a\u53ef\u4ee5\u88ab\u4f20\u9012\u3001\u88ab\u7ec4\u5408\u3001\u88ab\u7ec4\u5408\u7684\u8ba1\u7b97\u5355\u5143\u3002<\/p>\n

\u8fd9\u5c31\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u5a01\u529b：\u628a\u8ba1\u7b97\u5f53\u6570\u636e\u4f20\u9012\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

Java 8\u4e4b\u524d\u4f60\u5199\u56de\u8c03，\u5f97\u8fd9\u4e48\u5199：\/\/ Java 8\u4e4b\u524d：\u533f\u540d\u5185\u90e8\u7c7b
\nbutton.setOnClickListener(new OnClickListener() {Overridepublic void onClick(View v) {System.out.println(\\”clicked\\”);}
\n});\u56db\u884c\u4ee3\u7801，\u5c31\u4e3a\u4e86\u4f20\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u3002\u8fd9\u5c31\u662fJava\u65e9\u671f\u7684\\”\u533f\u540d\u51fd\u6570\\”\u2014\u2014\u533f\u540d\u5185\u90e8\u7c7b\u3002
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