iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

add constructor chaining example (#7125)

This commit is contained in:
Carlos Cano 2019-07-21 05:20:19 +02:00 committed by Josh Cummings
parent 8e6a12f1a2
commit 7eaa85d524
2 changed files with 36 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java
View File

@ -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);
}
}

38
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
View File

@ -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());
}
}