ffi: java interop improvements

examples/ffi.pork

@@ -1,9 +1,7 @@
 import std ffi.malloc
 
 export func main() {
-  while true {
-    let pointer = malloc(8192)
-    println(pointer)
-    free(pointer)
-  }
+  let pointer = malloc(8192)
+  println(pointer)
+  free(pointer)
 }

examples/java.pork

@@ -1,8 +1,13 @@
 import java java.lang.System
-
-func java_io_PrintStream_println(a) native java "java.io.PrintStream:virtual:println:void:String"
+import java java.io.PrintStream
+import java java.io.InputStreamReader
+import java java.io.BufferedReader
 
 export func main() {
+  let input = java_lang_System_in_get()
+  let reader = java_io_InputStreamReader_new_inputstream(input)
+  let bufferedReader = java_io_BufferedReader_new_reader(reader)
+  let line = java_io_BufferedReader_readLine(bufferedReader)
   let stream = java_lang_System_err_get()
-  java_io_PrintStream_println(stream, "Hello World")
+  java_io_PrintStream_println_string(stream, line)
 }