Use JavaKitFunction in example

Author: iainsmith

Samples/JavaKitSampleApp/Package.swift

@@ -67,6 +67,7 @@ let package = Package(
       name: "JavaKitExample",
       dependencies: [
         .product(name: "JavaKit", package: "swift-java"),
+        .product(name: "JavaKitFunction", package: "swift-java"),
         .product(name: "JavaKitJar", package: "swift-java"),
       ],
       swiftSettings: [

Samples/JavaKitSampleApp/Sources/JavaKitExample/JavaKitExample.swift

@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 import JavaKit
+import JavaKitFunction
 
 enum SwiftWrappedError: Error {
   case message(String)
@@ -44,6 +45,10 @@ extension HelloSwift: HelloSwiftNativeMethods {
     self.name = "a 🗑️-collected language"
     _ = self.sayHelloBack(42)
 
+    let predicate: JavaPredicate<JavaInteger> = self.lessThanTen()!
+    let value = predicate.test(JavaInteger(3).as(JavaObject.self))
+    print("Running a JavaPredicate from swift 3 < 10 = \(value)")
+
     let strings = doublesToStrings([3.14159, 2.71828])
     print("Converting doubles to strings: \(strings)")
 

Samples/JavaKitSampleApp/Sources/JavaKitExample/com/example/swift/HelloSwift.java

@@ -14,6 +14,8 @@
 
 package com.example.swift;
 
+import java.util.function.Predicate;
+
 public class HelloSwift {
     public double value;
     public static double initialValue = 3.14159;
@@ -40,6 +42,11 @@ public void greet(String name) {
         System.out.println("Salutations, " + name);
     }
 
+    public Predicate<Integer> lessThanTen() {
+        Predicate<Integer> predicate = i -> (i < 10);
+        return predicate;
+    }
+
     public String[] doublesToStrings(double[] doubles) {
         int size = doubles.length;
         String[] strings = new String[size];