Simplify how we run JavaSieve sample

Author: ktoso

Samples/JavaSieve/README.md

@@ -12,10 +12,9 @@ This example wraps an [open-source Java library](https://github.com/gazman-sdk/q
 git clone https://github.com/gazman-sdk/quadratic-sieve-Java
 cd quadratic-sieve-Java
 sh ./gradlew jar
+cd ..
 ```
 
-Then, copy the resulting Jar file (`./build/libs/QuadraticSieve-1.0.jar`) into the `Samples/JavaSieve` directory.
-
 Now we're ready to build and run the Swift program from `Samples/JavaSieve`:
 
 ```

Samples/JavaSieve/Sources/JavaSieve/main.swift

@@ -15,7 +15,11 @@
 import JavaKit
 import JavaMath
 
-let jvm = try JavaVirtualMachine.shared(classpath: ["QuadraticSieve-1.0.jar"])
+let jvm = try JavaVirtualMachine.shared(classpath: [
+  "quadratic-sieve-Java/build/libs/QuadraticSieve-1.0.jar",
+  ".",
+])
+
 do {
   let sieveClass = try JavaClass<SieveOfEratosthenes>(environment: jvm.environment())
   for prime in sieveClass.findPrimes(100)! {

Samples/JavaSieve/Sources/JavaSieve/swift-java.config

@@ -1,5 +1,5 @@
 {
-  "classpath" : "QuadraticSieve-1.0.jar",
+  "classpath" : ".:quadratic-sieve-Java/build/libs/QuadraticSieve-1.0.jar",
   "classes" : {
     "com.gazman.quadratic_sieve.QuadraticSieve" : "QuadraticSieve",
     "com.gazman.quadratic_sieve.core.BaseFact" : "BaseFact",