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[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val oneHalf = new Rational(1, 2);
<console>:7: error: not found: type Rational
val oneHalf = new Rational(1, 2);
^
scala> import scala.math._
import scala.math._
scala> val oneHalf = new Rational(1, 2);
<console>:10: error: not found: type Rational
val oneHalf = new Rational(1, 2);
^
scala> val pair = (99, "Luftballons")
pair: (Int, java.lang.String) = (99,Luftballons)
scala> println(pair._1)
99
scala> println(pair._2)
Luftballons
scala> [root@cdh2 test]#
[root@cdh2 test]# scala Ration.scala
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Ration.scala
at scala.sys.package$.error(package.scala:27)
at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
at scala.Option.getOrElse(Option.scala:108)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
[root@cdh2 test]# vim Ration.scala
[root@cdh2 test]# scalac Ration.scala
[root@cdh2 test]# scala Ration.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val oneHalf = new Rational(1, 2);
Created 1/2
oneHalf: Rational = Rational@14bf659
scala> [root@cdh2 test]#
[root@cdh2 test]# cat Ration.scala
class Rational(n: Int, d: Int) {
println("Created "+n+"/"+d)
}
[root@cdh2 test]# vim Rational.scala
[root@cdh2 test]# scalac Ration.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val oneHalf = new Rational(1, 2);
Created 1/2
oneHalf: Rational = Rational@c95759
scala> val x = new Rational(1, 3)
Created 1/3
x: Rational = Rational@d9b603
scala> [root@cdh2 test]#
[root@cdh2 test]# scalac Rational.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val x = new Rational(1, 3)
x: Rational = 1/3
scala> val oneHalf = new Rational(1, 2);
oneHalf: Rational = 1/2
scala> [root@cdh2 test]#
[root@cdh2 test]# cat Rational.scala
class Rational(n: Int, d: Int) {
override def toString = n +"/"+ d
}
[root@cdh2 test]# cat Ration.scala
class Rational(n: Int, d: Int) {
println("Created "+n+"/"+d)
}
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> new Rational(1, 2)
res0: Rational = 1/2
scala> val oneHalf = new Rational(1, 2);
oneHalf: Rational = 1/2
scala>
这个最初的Rational例子凸显了Java和Scala之间的不同。Java类具有可以带参数的构造器，而Scala类可以直接带参数。
Scala的写法更简洁——类参数可以直接在类的主体中使用；没必要定义字段然后写赋值函数把构造器的参数复制到字段里。
这可以潜在地节省很多固定写法，尤其是对小类来说。 Scala编译器将把你放在类内部的任何不是字段的部分或者方法定义的代码，
编译进主构造器。例如，你可以像这样打印输出一条除错消息：
class Rational(n: Int, d: Int) {
println("Created "+n+"/"+d)
} 根据这个代码，Scala编译器将把println调用放在Rational的主构造器。
因此，println调用将在每次创建一个新的Rational实例时打印这条除错信息。
scala> new Rational(5, 0)
res1: Rational = 5/0
scala> 除数为零并没有报错。
[root@cdh2 test]#
[root@cdh2 test]# vim Rational.scala
[root@cdh2 test]# scala Rational.scala
/user/local/test/Rational.scala:2: error: not found: value requre
requre(d!=0)
^
one error found
[root@cdh2 test]# vim Rational.scala
[root@cdh2 test]# scala Rational.scala
[root@cdh2 test]# scalac Rational.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> new Rational(5, 0)
java.lang.IllegalArgumentException: requirement failed
at scala.Predef$.require(Predef.scala:202)
at Rational.<init>(Rational.scala:2)
at .<init>(<console>:8)
at .<clinit>(<console>)
at .<init>(<console>:11)
at .<clinit>(<console>)
at $print(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920)
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
at java.lang.Thread.run(Thread.java:745)
scala> 除数为零报错正常现象。
scala> val oneHalf = new Rational(1, 2);
oneHalf: Rational = 1/2
scala>
scala> new Rational(5, 0)
res1: Rational = 5/0
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Rational.scala
[root@cdh2 test]# scala Rational.scala
/user/local/test/Rational.scala:2: error: not found: value requre
requre(d!=0)
^
one error found
[root@cdh2 test]# vim Rational.scala
[root@cdh2 test]# scala Rational.scala
[root@cdh2 test]# scalac Rational.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> new Rational(5, 0)
java.lang.IllegalArgumentException: requirement failed
at scala.Predef$.require(Predef.scala:202)
at Rational.<init>(Rational.scala:2)
at .<init>(<console>:8)
at .<clinit>(<console>)
at .<init>(<console>:11)
at .<clinit>(<console>)
at $print(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920)
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
at java.lang.Thread.run(Thread.java:745)
scala> val oneHalf = new Rational(1, 2);
oneHalf: Rational = 1/2
scala>
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Rationa.scala
[root@cdh2 test]# scalac Rationa.scala
Rationa.scala:5: error: value d is not a member of Rational
new Rational(n * that.d + that.n * d, d * that.d)
^
Rationa.scala:5: error: value d is not a member of Rational
new Rational(n * that.d + that.n * d, d * that.d)
^
two errors found
[root@cdh2 test]# cat Rationa.scala
class Rational(n: Int, d: Int) { // 编译不过
require(d != 0)
override def toString = n +"/"+ d
def add(that: Rational): Rational =
new Rational(n * that.d + that.n * d, d * that.d)
}
[root@cdh2 test]# vim Rationa_1.scala
[root@cdh2 test]# scala Rationa_1.scala
[root@cdh2 test]# scalac Rationa_1.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val oneHalf = new Rational(1, 2)
oneHalf: Rational = 1/2
scala> val twoThirds = new Rational(2, 3)
twoThirds: Rational = 2/3
scala> oneHalf add(twoThirds)
res0: Rational = 7/6
scala> [root@cdh2 test]#
[root@cdh2 test]# cat Rationa_1.scala
class Rational(n: Int, d: Int) {
require(d != 0)
val numer: Int = n
val denom: Int = d
override def toString = numer+"/"+denom
def add(that: Rational): Rational =
new Rational( numer * that.denom + that.numer * denom, denom * that.denom )
}
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val five = new Rational(5)
<console>:7: error: not enough arguments for constructor Rational: (n: Int, d: Int)Rational.
Unspecified value parameter d.
val five = new Rational(5)
^
scala> [root@cdh2 test]#
[root@cdh2 test]# cp Rationa_1.scala R
RangeArray.scala Rational.class Rationa.scala RegexD1.scala RegexD.scala RegexTest1.scala
Rationa_1.scala Rational.scala Ration.scala RegexD2.scala RegexReplace.scala RegexTest2.scala
[root@cdh2 test]# cp Rationa_1.scala Rationa_2.scala
[root@cdh2 test]# cat Rationa_1.scala
class Rational(n: Int, d: Int) {
require(d != 0)
val numer: Int = n
val denom: Int = d
override def toString = numer+"/"+denom
def add(that: Rational): Rational =
new Rational( numer * that.denom + that.numer * denom, denom * that.denom )
}
[root@cdh2 test]# vim Rationa_2.scala
[root@cdh2 test]# scala Rationa_2.scala
/user/local/test/Rationa_2.scala:5: error: value update is not a member of this.Rational
this(n:Int)=this(n,1)
^
one error found
[root@cdh2 test]# vim Rationa_2.scala
[root@cdh2 test]# scalac Rationa_2.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val five = new Rational(5)
five: Rational = 5/1
scala> five.
add asInstanceOf denom isInstanceOf numer toString
scala> five.denom
res0: Int = 1
scala> five.numer
res1: Int = 5
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Rationa_3.scala
[1]+ Stopped vim Rationa_3.scala
[root@cdh2 test]# cp Rationa_2.scala Rationa_3.scala
[root@cdh2 test]# vim Rationa_3.scala
[root@cdh2 test]# scalac Rationa_3.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> five.denom
<console>:8: error: not found: value five
five.denom
^
scala> val five = new Rational(5)
five: Rational = 5/1
scala> five.denom
res1: Int = 1
scala> val oneHalf = new Rational(1, 2)
oneHalf: Rational = 1/2
scala> val twoThirds = new Rational(2, 3)
twoThirds: Rational = 2/3
scala> oneHalf.max
def max(that: Rational): Rational
scala> oneHalf.max(twoThirds)
res2: Rational = 2/3
scala> twoThirds.max(oneHalf)
res3: Rational = 2/3
scala> twoThirds.lessThan(oneHalf)
res4: Boolean = false
scala> oneHalf.lessThan(twoThirds)
res5: Boolean = true
scala> [root@cdh2 test]#
[root@cdh2 test]# cat Rationa_3.scala
class Rational(n: Int, d: Int) {
require(d != 0)
val numer: Int = n
val denom: Int = d
def this(n:Int)=this(n,1)
override def toString = numer+"/"+denom
def add(that: Rational): Rational =
new Rational( numer * that.denom + that.numer * denom, denom * that.denom )
def lessThan(that: Rational) =
this.numer * that.denom < that.numer * this.denom // 移项法 this.numer/this.denom < that.numer/that.denom
def max(that: Rational) =
if (this.lessThan(that))
that
else
this
}
[root@cdh2 test]#
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> new Rational(66, 42)
res0: Rational = 66/42
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Rationa_4.scala
[root@cdh2 test]# scalac Rationa_4.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> new Rational(66, 42)
res0: Rational = 11/7
scala> [root@cdh2 test]#
[root@cdh2 test]# cat Rationa_4.scala
class Rational(n: Int, d: Int) {
require(d != 0)
private val g = gcd(n.abs, d.abs)
val numer = n / g
val denom = d / g
def this(n: Int) = this(n, 1)
def add(that: Rational): Rational =
new Rational( numer * that.denom + that.numer * denom, denom * that.denom )
override def toString = numer+"/"+denom
private def gcd(a: Int, b: Int): Int =
if (b == 0)
a
else
gcd(b, a % b)
}
这个版本的Rational里，我们添加了私有字段，g，并修改了numer和denom的初始化器（初始化器：initializer是初始化变量，
例如初始化numer的“n / g”，的代码）。因为g是私有的，它只能在类的主体之内，而不能在外部被访问。我们还添加了一个私有方法，
gcd，用来计算传入的两个Int的最大公约数。比方说，gcd(12, 8)是4。正如你在4.1节中看到的，想让一个字段或方法私有化你只要把
private关键字放在定义的前面。私有的“助手方法”gcd的目的是把类的其它部分，这里是主构造器，需要的代码分离出来。为了确保
g始终是正的，我们传入n和d的绝对值，调用abs即可获得任意整数的绝对值。
Scala编译器将把Rational的三个字段的初始化代码依照它们在源代码中出现的次序放入主构造器。所以g的初始化代码，gcd(n.abs, d.abs)，
将在另外两个之前执行，因为它在源文件中出现得最早。g将被初始化为类参数，n和d，的绝对值的最大公约数。然后再被用于numer和denom的初始化。
通过把n和d整除它们的最大公约数，g，每个Rational都将被构造成它的最简形式：
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> 12.abs
res0: Int = 12
scala> -12.abs
res1: Int = 12
scala> (-12).abs
res2: Int = 12
scala> -10.abs
res3: Int = 10
scala> 10.abs
res4: Int = 10
scala> 0.009.abs
res5: Double = 0.009
scala> -0.009.abs
res6: Double = 0.009
scala>
scala> new Rational(66, 42)
res7: Rational = 11/7
scala> new Rational(40, 10)
res8: Rational = 4/1
scala> new Rational(40, 20)
res9: Rational = 2/1
scala> new Rational(40,0)
java.lang.IllegalArgumentException: requirement failed
at scala.Predef$.require(Predef.scala:202)
at Rational.<init>(Rationa_4.scala:2)
at .<init>(<console>:8)
at .<clinit>(<console>)
at .<init>(<console>:11)
at .<clinit>(<console>)
at $print(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920)
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
at java.lang.Thread.run(Thread.java:745)
scala> new Rational(40)
res11: Rational = 40/1
scala> 2+3
res12: Int = 5
scala> 2/3+2/4
res13: Int = 0
scala> 2/3 add 2/4
<console>:8: error: value add is not a member of Int
2/3 add 2/4
^
scala> (2/3).add(2/4)
<console>:8: error: value add is not a member of Int
(2/3).add(2/4)
^
scala> 2 add 3
<console>:8: error: value add is not a member of Int
2 add 3
^
scala> val oneHalf = new Rational(1, 2)
oneHalf: Rational = 1/2
scala> val twoThirds = new Rational(2, 3)
twoThirds: Rational = 2/3
scala> oneHalf.add(twoThirds)
res17: Rational = 7/6
scala> oneHalf add twoThirds
res18: Rational = 7/6
scala> oneHalf + twoThirds
<console>:10: error: type mismatch;
found : Rational
required: String
oneHalf + twoThirds
^
scala> [root@cdh2 test]#
[root@cdh2 test]# vim Rationa_5.scala
[root@cdh2 test]# scalac Rationa_5.scala
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val oneHalf = new Rational(1, 2)
oneHalf: Rational = 1/2
scala> val twoThirds = new Rational(2, 3)
twoThirds: Rational = 2/3
scala> oneHalf + twoThirds
res0: Rational = 7/6
scala> oneHalf *twoThirds
res1: Rational = 1/3
scala> [root@cdh2 test]#
[root@cdh2 test]# cat Rationa_5.scala
class Rational(n: Int, d: Int) {
require(d != 0)
private val g = gcd(n.abs, d.abs)
val numer = n / g
val denom = d / g
def this(n: Int) = this(n, 1)
def +(that: Rational): Rational =
new Rational( numer * that.denom + that.numer * denom, denom * that.denom )
def *(that: Rational): Rational =
new Rational(numer * that.numer, denom * that.denom)
override def toString = numer+"/"+denom
private def gcd(a: Int, b: Int): Int =
if (b == 0)
a
else
gcd(b, a % b) }
[root@cdh2 test]#
[root@cdh2 test]# cat Rationa_5.scala
class Rational(n: Int, d: Int) {
require(d != 0)
private val g = gcd(n.abs, d.abs)
val numer = n / g
val denom = d / g
def this(n: Int) = this(n, 1)
def +(that: Rational): Rational =
new Rational( numer * that.denom + that.numer * denom, denom * that.denom )
def *(that: Rational): Rational =
new Rational(numer * that.numer, denom * that.denom)
override def toString = numer+"/"+denom
private def gcd(a: Int, b: Int): Int =
if (b == 0)
a
else
gcd(b, a % b) }
[root@cdh2 test]# scala
Welcome to Scala version 2.9.3 (Java HotSpot(TM) Client VM, Java 1.7.0_67).
Type in expressions to have them evaluated.
Type :help for more information.
scala> oneHalf *twoThirds
<console>:8: error: not found: value oneHalf
oneHalf *twoThirds
^
scala> val twoThirds = new Rational(2, 3)
twoThirds: Rational = 2/3
scala> val oneHalf = new Rational(1, 2)
oneHalf: Rational = 1/2
scala> oneHalf *twoThirds
res1: Rational = 1/3
scala> oneHalf + twoThirds
res2: Rational = 7/6
scala> oneHalf .+ twoThirds
<console>:9: error: missing arguments for method + in class Rational;
follow this method with `_' if you want to treat it as a partially applied function
oneHalf .+ twoThirds
^
scala> oneHalf .+ (twoThirds)
res4: Rational = 7/6
scala>
scala> val x = new Rational(1, 2)
x: Rational = 1/2
scala> val y = new Rational(2, 3)
y: Rational = 2/3
scala> x.+(y)
res5: Rational = 7/6
scala> x + y
res6: Rational = 7/6
scala> x + x * y
res7: Rational = 5/6
scala> (x + x) * y
res8: Rational = 2/3
scala> x + (x * y)
res9: Rational = 5/6
scala>
[root@cdh2 test]# ctrl + d
[root@cdh2 test]# ll
total 280
-rw-r--r-- 1 root root 65 Jul 10 23:59 2qw
-rw-r--r-- 1 root root 946 Jul 8 00:31 AppTest$$anonfun$1.class
-rw-r--r-- 1 root root 1425 Jul 8 00:31 AppTest.class
-rw-r--r-- 1 root root 1956 Jul 8 00:31 AppTest$.class
-rw-r--r-- 1 root root 1137 Jul 8 00:31 AppTest$delayedInit$body.class
-rw-r--r-- 1 root root 161 Jul 8 00:31 AppTest.scala
-rw-r--r-- 1 root root 632 Jul 5 02:15 ArrayTest.scala
drwxr-xr-x 2 root root 4096 Jul 5 00:58 bak
-rw-r--r-- 1 root root 650 Jul 5 04:58 BreakTest1.scala
-rw-r--r-- 1 root root 401 Jul 5 04:56 BreakTest.scala
-rw-r--r-- 1 root root 330 Jul 4 19:45 CaseTest2.scala
-rw-r--r-- 1 root root 354 Jul 4 20:07 CaseTest3.scala
-rw-r--r-- 1 root root 263 Jul 4 19:38 CaseTest.scala
drwxr-xr-x 5 root root 4096 Jul 5 05:29 classes
-rw-r--r-- 1 root root 351 Jul 5 02:27 ConcatArray.scala
-rw-r--r-- 1 root root 239 Jul 5 02:03 ConsoleTes.scala
-rw-r--r-- 1 root root 197 Jul 5 01:51 ConsoleTest.scala
-rw-r--r-- 1 root root 239 Jul 5 05:02 DoWhileTest.scala
-rw-r--r-- 1 root root 238 Jul 5 03:42 Factor.scala
-rw-r--r-- 1 root root 238 Jul 5 03:42 FactorTest.scala
-rw-r--r-- 1 root root 475 Jul 4 23:37 File1.scala
-rw-r--r-- 1 root root 529 Jul 4 23:40 File2.scala
-rw-r--r-- 1 root root 411 Jul 4 23:32 File.scala
-rw-r--r-- 1 root root 189 Jul 5 01:26 FileWR.scala
-rw-r--r-- 1 root root 403 Jul 5 03:37 FormatTest.scala
-rw-r--r-- 1 root root 585 Jul 4 20:15 ForTest.scala
-rw-r--r-- 1 root root 414 Jul 5 03:59 Fun2.scala
-rw-r--r-- 1 root root 388 Jul 5 03:49 Fun.scala
-rw-r--r-- 1 root root 325 Jul 5 05:29 HelloWorld23.scala
-rw-r--r-- 1 root root 104 Jul 4 18:44 HelloWorld2.scala
-rw-r--r-- 1 root root 88 Jul 4 04:18 HelloWorld.scala
-rw-r--r-- 1 root root 86 Jul 5 05:24 Hl.scala
-rw-r--r-- 1 root root 204 Jul 5 05:04 IfTest.scala
-rw-r--r-- 1 root root 438 Jul 5 02:21 MatrixTest.scala
-rw-r--r-- 1 root root 183 Jul 5 04:35 Other.scala
-rw-r--r-- 1 root root 223 Jul 5 04:21 Outer1.scala
-rw-r--r-- 1 root root 169 Jul 5 04:14 Outer.scala
-rwxr-xr-x 1 root root 193 Jul 4 04:06 person.sh
-rw-r--r-- 1 root root 365 Jul 5 04:38 ProtectPub.scala
-rw-r--r-- 1 root root 424 Jul 5 03:25 RangeArray.scala
-rw-r--r-- 1 root root 262 Jul 11 00:44 Rationa_1.scala
-rw-r--r-- 1 root root 290 Jul 11 01:05 Rationa_2.scala
-rw-r--r-- 1 root root 475 Jul 11 01:24 Rationa_3.scala
-rw-r--r-- 1 root root 425 Jul 11 02:11 Rationa_4.scala
-rw-r--r-- 1 root root 516 Jul 11 02:44 Rationa_5.scala
-rw-r--r-- 1 root root 2274 Jul 11 02:44 Rational.class
-rw-r--r-- 1 root root 87 Jul 11 00:19 Rational.scala
-rw-r--r-- 1 root root 200 Jul 11 00:29 Rationa.scala
-rw-r--r-- 1 root root 65 Jul 10 23:59 Ration.scala
-rw-r--r-- 1 root root 234 Jul 4 22:12 RegexD1.scala
-rw-r--r-- 1 root root 250 Jul 4 22:18 RegexD2.scala
-rw-r--r-- 1 root root 349 Jul 4 22:07 RegexD.scala
-rw-r--r-- 1 root root 231 Jul 4 21:54 RegexReplace.scala
-rw-r--r-- 1 root root 270 Jul 4 21:48 RegexTest1.scala
-rw-r--r-- 1 root root 243 Jul 4 20:49 RegexTest2.scala
-rwxr-xr-x 1 root root 166 Jul 4 04:13 script.sh
-rw-r--r-- 1 root root 602 Jul 5 00:00 Some1.scala
-rw-r--r-- 1 root root 633 Jul 5 00:01 Some.scala
-rw-r--r-- 1 root root 205 Jul 5 01:55 SourceTest.scala
-rw-r--r-- 1 root root 435 Jul 5 03:35 Str.scala
-rw-r--r-- 1 root root 111 Jul 5 05:21 Symb.scala
-rw-r--r-- 1 root root 769 Jul 4 19:07 Test2.scala
-rw-r--r-- 1 root root 426 Jul 4 19:13 Test3.scala
-rw-r--r-- 1 root root 408 Jul 5 00:08 TestExtractor.scala
-rw-r--r-- 1 root root 493 Jul 4 19:00 Test.scala
-rw-r--r-- 1 root root 27 Jul 5 01:57 test.txt
-rw-r--r-- 1 root root 815 Jul 4 19:31 TraitTest.scala
-rw-r--r-- 1 root root 238 Jul 5 04:42 While.scala
-rw-r--r-- 1 root root 176 Jul 5 04:46 WhileTest1.scala
-rw-r--r-- 1 root root 238 Jul 5 04:44 WhileTest.scala
[root@cdh2 test]# sc
scala scl_enabled scrollkeeper-get-extended-content-list
scala.bat sclient scrollkeeper-get-index-from-docpath
scalac scp scrollkeeper-get-toc-from-docpath
scalac.bat script scrollkeeper-get-toc-from-id
scaladoc scriptreplay scrollkeeper-install
scaladoc.bat scrollkeeper-config scrollkeeper-preinstall
scalap scrollkeeper-extract scrollkeeper-rebuilddb
scalap.bat scrollkeeper-gen-seriesid scrollkeeper-uninstall
schemagen scrollkeeper-get-cl scrollkeeper-update
scl scrollkeeper-get-content-list scsi_id
[root@cdh2 test]# script.sh
bash: script.sh: command not found
[root@cdh2 test]# ./ script.sh
bash: ./: is a directory
[root@cdh2 test]# sh script.sh
Hello, world! List()
[root@cdh2 test]# Unix和Windows的Scala脚本
[root@cdh2 test]# cat script.sh
#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world! " + args.toList)
}
}
HelloWorld.main(args)
[root@cdh2 test]# cat script.sh hahahajj
#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world! " + args.toList)
}
}
HelloWorld.main(args)
cat: hahahajj: No such file or directory
[root@cdh2 test]# sh script.sh haha jj hehe hiehie
Hello, world! List(haha, jj, hehe, hiehie)
[root@cdh2 test]# vim shellarg.sh
[root@cdh2 test]# ls -l shellarg.sh
-rw-r--r-- 1 root root 102 Jul 11 04:19 shellarg.sh
[root@cdh2 test]# chmod a+x shellarg.sh
[root@cdh2 test]# ls -l shellarg.sh
-rwxr-xr-x 1 root root 102 Jul 11 04:19 shellarg.sh
[root@cdh2 test]# sh shellarg.sh chmoda+x
shellarg.sh: line 3: syntax error near unexpected token `"Hello, "'
shellarg.sh: line 3: `println("Hello, " + args(0) + "!")'
[root@cdh2 test]# sh shellarg.sh chmoda
shellarg.sh: line 3: syntax error near unexpected token `"Hello, "'
shellarg.sh: line 3: `println("Hello, " + args(0) + "!")'
[root@cdh2 test]# vim shellarg.sh
[root@cdh2 test]# sh shellarg.sh chmoda
error: script file does not close its header with !# or ::!#
one error found
[root@cdh2 test]# cat shellarg.sh
#!/bin/sh
exec scala "$0" "$@" !
# // 对第一个参数打招呼
println("Hello, " + args(0) + "!")
[root@cdh2 test]# vim shellarg.sh
[root@cdh2 test]# sh shellarg.sh chmoda
Hello, chmoda!
[root@cdh2 test]# cat shellarg.sh
#!/bin/sh
exec scala "$0" "$@"
!#
// 对第一个参数打招呼
println("Hello, " + args(0) + "!")
[root@cdh2 test]#
[root@cdh2 test]# pwd
/user/local/test
[root@cdh2 test]# sh shellarg.sh chmoda
Hello, chmoda!
[root@cdh2 test]# sh shellarg.sh chmoda+x hh
Hello, chmoda+x!
[root@cdh2 test]#
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原文地址：http://blog.csdn.net/hzdxw/article/details/51883422
