From 7eaa85d524a1e435e8550ff333e8955b319546f4 Mon Sep 17 00:00:00 2001
From: Carlos Cano <carlcan.93@gmail.com>
Date: Sun, 21 Jul 2019 05:20:19 +0200
Subject: [PATCH] add constructor chaining example (#7125)

---
 .../baeldung/constructors/BankAccount.java    | 12 ++++++
 .../constructors/ConstructorUnitTest.java     | 38 ++++++++++++-------
 2 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java b/core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java
index 3d50e85245..b78b5937e1 100644
--- a/core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java
+++ b/core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java
@@ -54,3 +54,15 @@ class BankAccountCopyConstructor extends BankAccount {
         this.balance = 0.0f;
     }
 }
+
+class BankAccountChainedConstructors extends BankAccount {
+    public BankAccountChainedConstructors(String name, LocalDateTime opened, double balance) {
+        this.name = name;
+        this.opened = opened;
+        this.balance = balance;
+    }
+
+    public BankAccountChainedConstructors(String name) {
+        this(name, LocalDateTime.now(), 0.0f);
+    }
+}
diff --git a/core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java b/core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
index 2cd8832fbf..66c8520e34 100644
--- a/core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
+++ b/core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
@@ -1,15 +1,14 @@
 package com.baeldung.constructors;
 
-import com.baeldung.constructors.*;
+import com.google.common.collect.Comparators;
+import org.junit.Test;
 
-import java.util.logging.Logger;
 import java.time.LocalDateTime;
 import java.time.Month;
+import java.util.ArrayList;
+import java.util.logging.Logger;
 
-import org.junit.Test;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatCode;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.Assertions.*;
 
 public class ConstructorUnitTest {
     final static Logger LOGGER = Logger.getLogger(ConstructorUnitTest.class.getName());
@@ -17,26 +16,28 @@ public class ConstructorUnitTest {
     @Test
     public void givenNoExplicitContructor_whenUsed_thenFails() {
         BankAccount account = new BankAccount();
-        assertThatThrownBy(() -> { account.toString(); }).isInstanceOf(Exception.class);
+        assertThatThrownBy(() -> {
+            account.toString();
+        }).isInstanceOf(Exception.class);
     }
 
     @Test
     public void givenNoArgumentConstructor_whenUsed_thenSucceeds() {
         BankAccountEmptyConstructor account = new BankAccountEmptyConstructor();
         assertThatCode(() -> {
-                account.toString();
-            }).doesNotThrowAnyException();
+            account.toString();
+        }).doesNotThrowAnyException();
     }
 
     @Test
     public void givenParameterisedConstructor_whenUsed_thenSucceeds() {
         LocalDateTime opened = LocalDateTime.of(2018, Month.JUNE, 29, 06, 30, 00);
         BankAccountParameterizedConstructor account =
-            new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
-        
+                new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
+
         assertThatCode(() -> {
-                account.toString();
-            }).doesNotThrowAnyException();
+            account.toString();
+        }).doesNotThrowAnyException();
     }
 
     @Test
@@ -47,7 +48,16 @@ public class ConstructorUnitTest {
 
         assertThat(account.getName()).isEqualTo(newAccount.getName());
         assertThat(account.getOpened()).isNotEqualTo(newAccount.getOpened());
-        
+
         assertThat(newAccount.getBalance()).isEqualTo(0.0f);
     }
+
+    @Test
+    public void givenChainedConstructor_whenUsed_thenMaintainsLogic() {
+        BankAccountChainedConstructors account = new BankAccountChainedConstructors("Tim");
+        BankAccountChainedConstructors newAccount = new BankAccountChainedConstructors("Tim", LocalDateTime.now(), 0.0f);
+
+        assertThat(account.getName()).isEqualTo(newAccount.getName());
+        assertThat(account.getBalance()).isEqualTo(newAccount.getBalance());
+    }
 }