Add remaining examples

immutables/src/main/java/com/baeldung/immutable/default_/Person.java

@@ -0,0 +1,14 @@
+package com.baeldung.immutable.default_;
+
+import org.immutables.value.Value;
+
+@Value.Immutable(prehash = true)
+public abstract class Person {
+
+    abstract String getName();
+
+    @Value.Default
+    Integer getAge() {
+        return 42;
+    }
+}

immutables/src/main/java/com/baeldung/immutable/parameter/Person.java

@@ -0,0 +1,14 @@
+package com.baeldung.immutable.parameter;
+
+
+import org.immutables.value.Value;
+
+@Value.Immutable
+public abstract class Person {
+
+    @Value.Parameter
+    abstract String getName();
+
+    @Value.Parameter
+    abstract Integer getAge();
+}

immutables/src/main/java/com/baeldung/immutable/prehash/Person.java

@@ -0,0 +1,9 @@
+package com.baeldung.immutable.prehash;
+
+import org.immutables.value.Value;
+
+@Value.Immutable(prehash = true)
+public abstract class Person {
+    abstract String getName();
+    abstract Integer getAge();
+}

immutables/src/test/java/com/baeldung/immutable/default_/ImmutablePersonDefaultTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.immutable.default_;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ImmutablePersonDefaultTest {
+
+    @Test
+    public void whenInstantiating_shouldUseDefaultValue() throws Exception {
+
+        final com.baeldung.immutable.default_.ImmutablePerson john = com.baeldung.immutable.default_.ImmutablePerson.builder().name("John").build();
+
+        assertThat(john.getAge()).isEqualTo(42);
+
+    }
+}