Script Programming(스크립트 프로그래밍)

import java.io._

object testHexView_03 {

    def printUsage() {
        println("Usage: scala testHexView_03 [filename]")
    }

    def toHex(n: Int) : String = {
        var s = ""
        var x1 = (n & 0xF0) >> 4
        var x2 = n & 0xF
        if (x1 < 10) {
            s = s + "%c".format(('0' + x1) toChar)
        }
        else {
            s = s + "%c".format('A' + (x1 - 10))
        }
        if (x2 < 10) {
            s = "%s%c".format(s, ('0' + x2) toChar)
        }
        else {
            s = s + "%c".format('A' + (x2 - 10))
        }
        return s
    }

    def toHex8(n: Int) : String = {
        var s = ""
        var x1 = (n & 0xF0000000) >> 28
        var x2 = (n & 0xF000000) >> 24
        var x3 = (n & 0xF00000) >> 20
        var x4 = (n & 0xF0000) >> 16
        var x5 = (n & 0xF000) >> 12
        var x6 = (n & 0xF00) >> 8
        var x7 = (n & 0xF0) >> 4
        var x8 = n & 0xF
        if (x1 < 10) {
            s = s + "%c".format(('0' + x1) toChar)
        }
        else {
            s = s + "%c".format('A' + (x1 - 10))
        }
        if (x2 < 10) {
            s = "%s%c".format(s, ('0' + x2) toChar)
        }
        else {
            s = s + "%c".format('A' + (x2 - 10))
        }
        if (x3 < 10) {
            s = "%s%c".format(s, ('0' + x3) toChar)
        }
        else {
            s = s + "%c".format('A' + (x3 - 10))
        }
        if (x4 < 10) {
            s = "%s%c".format(s, ('0' + x4) toChar)
        }
        else {
            s = s + "%c".format('A' + (x4 - 10))
        }
        s = s + " "
        if (x5 < 10) {
            s = "%s%c".format(s, ('0' + x5) toChar)
        }
        else {
            s = s + "%c".format('A' + (x5 - 10))
        }
        if (x6 < 10) {
            s = "%s%c".format(s, ('0' + x6) toChar)
        }
        else {
            s = s + "%c".format('A' + (x6 - 10))
        }
        if (x7 < 10) {
            s = "%s%c".format(s, ('0' + x7) toChar)
        }
        else {
            s = s + "%c".format('A' + (x7 - 10))
        }
        if (x8 < 10) {
            s = "%s%c".format(s, ('0' + x8) toChar)
        }
        else {
            s = s + "%c".format('A' + (x8 - 10))
        }
        return s
    }

    def main(args: Array[String]) {
            if (args.length < 1) {
                printUsage()
                System.exit(1)
            }

            var fname : String = args(0)

            var infile : File = new File(fname);
            if  (!infile.exists()) {
                 System.out.println("The file \"" + fname + "\" does not exist.");
                 System.exit(1);
            }

            if (!infile.canRead()) {
                 System.out.println("The file \"" + fname + "\" is not allowed to be read.");
                 System.exit(1);
            }   

            if  (infile.isDirectory()) {
                 System.out.println("\"" + fname + "\" is a directory.");
                 System.exit(1);
            }

            val is = new FileInputStream(fname)
            val cnt = is.available

            var lines = new Array[String](19)
            var b = new Array[Byte](1)

            printf("The size of the file \"%s\" is %d.\n", fname, cnt)
            printf("\n")

            var n = 0
            var dum = ""
            while (n < cnt) {
                if (n % 16 == 0) {
                    printf("%s: ", toHex8(n))
                }
                is.read(b)
                if (n % 16 == 8) {
                    printf("-%s", toHex(b(0) toInt))
                }
                else {
                    printf(" %s", toHex(b(0) toInt))
                }
                if ((b(0) toInt) < (' ' toInt) || (b(0) toInt) > 0x7F) {
                    dum = dum + "."
                }
                else {
                    dum = dum + "%c".format(b(0) toChar)
                }
                if (n % 16 == 15) {
                    printf("  |%s|\n", dum)
                    dum = ""
                }
                n += 1
            }
            if (n % 16 > 0) {
                for (j <- 1 to 16 - (n % 16)) {
                    printf("   ")
                }
                printf("  |%s", dum)
                for (j <- 1 to 16 - (n % 16)) {
                    printf(" ")
                }
                printf("|\n", dum)
                dum = ""
            }
            printf("\nRead %d bytes.\n", n)

            is.close()
    }
}

package examples;

class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, world!");
        System.out.println("안녕하세요?");
    }
}

/*
Console Output:
Hello, world!
안녕하세요?
*/

package examples

object HelloWorld {
    def main(args: Array[String]) {
        println("Hello, world!")
        println("안녕하세요?")
    }
}

/*
Console Output:
Hello, world!
안녕하세요?
*/

scala> var x : Int = 5
x: Int = 5

scala> x = 7
x: Int = 7

scala> val y = x
y: Int = 7

scala> y = 3
<console>:6: error: reassignment to val
       y = 3
         ^

scala> def t = x*x      // lazy evaluation
t: Int

scala> t
res2: Int = 49

scala> x = 10
x: Int = 10

scala> t
res4: Int = 100

scala> exit