BAEL-6611 add example code for completablefuture vs future vs rxjava comparison

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/futurevscompletablefuturevsrxjava/ObjectCallable.java

@@ -0,0 +1,10 @@
+package com.baeldung.concurrent.futurevscompletablefuturevsrxjava;
+
+import java.util.concurrent.Callable;
+
+public class ObjectCallable implements Callable<TestObject> {
+    @Override
+    public TestObject call() throws Exception {
+        return new TestObject();
+    }
+}

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/futurevscompletablefuturevsrxjava/ObjectHydrator.java

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+package com.baeldung.concurrent.futurevscompletablefuturevsrxjava;
+
+public class ObjectHydrator {
+
+    public TestObject hydrateTestObject(TestObject testObject){
+        testObject.setDataPointTwo(20);
+        return testObject;
+    }
+
+}

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/futurevscompletablefuturevsrxjava/ObjectSupplier.java

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+package com.baeldung.concurrent.futurevscompletablefuturevsrxjava;
+
+import java.util.function.Supplier;
+
+public class ObjectSupplier implements Supplier<TestObject> {
+
+    @Override
+    public TestObject get() {
+        return new TestObject();
+    }
+}

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/futurevscompletablefuturevsrxjava/TestObject.java

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+package com.baeldung.concurrent.futurevscompletablefuturevsrxjava;
+
+public class TestObject {
+
+    private int dataPointOne;
+    private int dataPointTwo;
+
+    public TestObject() {
+        dataPointOne = 10;
+    }
+
+    public int getDataPointOne() {
+        return dataPointOne;
+    }
+
+    public void setDataPointOne(int dataPointOne) {
+        this.dataPointOne = dataPointOne;
+    }
+
+    public int getDataPointTwo() {
+        return dataPointTwo;
+    }
+
+    public void setDataPointTwo(int dataPointTwo) {
+        this.dataPointTwo = dataPointTwo;
+    }
+
+    @Override
+    public String toString() {
+        return "TestObject{" + "dataPointOne=" + dataPointOne + ", dataPointTwo=" + dataPointTwo + '}';
+    }
+}