Difference between revisions of "Scheme for Java Programmer"
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| Line 1: | Line 1: | ||
| + | {{Admon/obsolete}} | ||
| + | |||
| + | <h1>NexJ-Scheme combines the powers of Scheme and Java. You can get the best of both.</h1> | ||
| + | |||
<pre> | <pre> | ||
| + | |||
String | String | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
String st = new String("Seneca"); | String st = new String("Seneca"); | ||
st = st.replace("e", "u"); | st = st.replace("e", "u"); | ||
System.out.println(st); // Sunuca | System.out.println(st); // Sunuca | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(define st (java.lang.String'new "Seneca")) | (define st (java.lang.String'new "Seneca")) | ||
(set! st (st'replace "e" "u" )) | (set! st (st'replace "e" "u" )) | ||
| Line 15: | Line 20: | ||
if | if | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
int x = 3, y = 5, large = 0; | int x = 3, y = 5, large = 0; | ||
if (x > y) | if (x > y) | ||
| Line 24: | Line 29: | ||
System.out.print(large); // 5 | System.out.print(large); // 5 | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(define x 3) | (define x 3) | ||
(define y 5) | (define y 5) | ||
| Line 38: | Line 43: | ||
for | for | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
for (int i = 0; i < 10; i++) | for (int i = 0; i < 10; i++) | ||
System.out.print(i); // 0123456789 | System.out.print(i); // 0123456789 | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(for ((i 0)) (< i 10) (set! i (+ i 1)) | (for ((i 0)) (< i 10) (set! i (+ i 1)) | ||
(display i) ; 0123456789 | (display i) ; 0123456789 | ||
| Line 50: | Line 55: | ||
While | While | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
int n = 0; | int n = 0; | ||
while(n < 10){ | while(n < 10){ | ||
| Line 58: | Line 63: | ||
// 0123456789 | // 0123456789 | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(define n 0) | (define n 0) | ||
| Line 71: | Line 76: | ||
Switch Case | Switch Case | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
int x = 7; | int x = 7; | ||
String st = ""; | String st = ""; | ||
| Line 82: | Line 87: | ||
System.out.println(st); | System.out.println(st); | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(define x 7) | (define x 7) | ||
(define st "") | (define st "") | ||
| Line 99: | Line 104: | ||
Iterator | Iterator | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
ArrayList numbers = new ArrayList(); | ArrayList numbers = new ArrayList(); | ||
| Line 109: | Line 114: | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(import 'java.util.ArrayList) | (import 'java.util.ArrayList) | ||
(define numbers (java.util.ArrayList'new)) | (define numbers (java.util.ArrayList'new)) | ||
| Line 124: | Line 129: | ||
Try and Catch | Try and Catch | ||
| − | >>>> in Java | + | >>>>>>>> in Java |
try { | try { | ||
| Line 136: | Line 141: | ||
// finally | // finally | ||
| − | >>>> in Scheme | + | >>>>>>>> in Scheme |
(try | (try | ||
(define x (/ 1 0)) | (define x (/ 1 0)) | ||
| Line 142: | Line 147: | ||
(display "finally") | (display "finally") | ||
) | ) | ||
| − | ; | + | ; finally |
; #<java.lang.ArithmeticException: / by zero> | ; #<java.lang.ArithmeticException: / by zero> | ||
| − | |||
| − | |||
| − | |||
</pre> | </pre> | ||
Latest revision as of 21:45, 26 January 2014
This page may be obsolete.
It contains historical information.
It contains historical information.
NexJ-Scheme combines the powers of Scheme and Java. You can get the best of both.
String
>>>>>>>> in Java
String st = new String("Seneca");
st = st.replace("e", "u");
System.out.println(st); // Sunuca
>>>>>>>> in Scheme
(define st (java.lang.String'new "Seneca"))
(set! st (st'replace "e" "u" ))
(display st) ; Sunuca
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
if
>>>>>>>> in Java
int x = 3, y = 5, large = 0;
if (x > y)
large = x;
else
large = y;
System.out.print(large); // 5
>>>>>>>> in Scheme
(define x 3)
(define y 5)
(define large 0)
(if (> x y)
(set! large x)
(set! large y)
)
(display large) ; 5
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
for
>>>>>>>> in Java
for (int i = 0; i < 10; i++)
System.out.print(i); // 0123456789
>>>>>>>> in Scheme
(for ((i 0)) (< i 10) (set! i (+ i 1))
(display i) ; 0123456789
)
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
While
>>>>>>>> in Java
int n = 0;
while(n < 10){
System.out.print(n);
n++;
}
// 0123456789
>>>>>>>> in Scheme
(define n 0)
(while (< n 10)
(display n)
(set! n (+ n 1))
)
; 0123456789
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
Switch Case
>>>>>>>> in Java
int x = 7;
String st = "";
switch (x){
case 1: st = "one"; break;
case 3: st = "three"; break;
case 7: st = "seven"; break;
default: st = "else";
}
System.out.println(st);
>>>>>>>> in Scheme
(define x 7)
(define st "")
(case x
((1) (set! st 'one))
((3) (set! st 'three))
((7) (set! st 'seven))
(else (set! st 'else))
)
(display st) ; seven
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
Iterator
>>>>>>>> in Java
ArrayList numbers = new ArrayList();
for (int i = 0; i < 10; i++)
numbers.add(i);
for (Iterator iterator = numbers.iterator(); iterator.hasNext();)
System.out.print(iterator.next()); // 0123456789
>>>>>>>> in Scheme
(import 'java.util.ArrayList)
(define numbers (java.util.ArrayList'new))
(for ((i 0)) (< i 10) (set! i (+ i 1))
(numbers'add i)
)
(for ((it (numbers'iterator))) (it'hasNext) ()
(write (it'next)) ; 0123456789
)
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
Try and Catch
>>>>>>>> in Java
try {
int x = 1 /0;
} catch (ArithmeticException e) {
e.printStackTrace();
} finally{
System.out.println("finally");
}
// java.lang.ArithmeticException: / by zero
// finally
>>>>>>>> in Scheme
(try
(define x (/ 1 0))
(lambda (e) e)
(display "finally")
)
; finally
; #<java.lang.ArithmeticException: / by zero>
