diff --git a/core-java/src/main/java/com/baeldung/arraycopy/model/Address.java b/core-java/src/main/java/com/baeldung/arraycopy/model/Address.java new file mode 100644 index 0000000000..43c6d77fe6 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/arraycopy/model/Address.java @@ -0,0 +1,61 @@ +package com.baeldung.arraycopy.model; + +public class Address implements Cloneable { + private String country; + private String state; + private String city; + private String street; + private String zipcode; + + public String getCountry() { + return country; + } + + public void setCountry(String country) { + this.country = country; + } + + public String getState() { + return state; + } + + public void setState(String state) { + this.state = state; + } + + public String getCity() { + return city; + } + + public void setCity(String city) { + this.city = city; + } + + public String getStreet() { + return street; + } + + public void setStreet(String street) { + this.street = street; + } + + public String getZipcode() { + return zipcode; + } + + public void setZipcode(String zipcode) { + this.zipcode = zipcode; + } + + @Override + protected Object clone() throws CloneNotSupportedException { + super.clone(); + Address address = new Address(); + address.setCity(this.city); + address.setCountry(this.country); + address.setState(this.state); + address.setStreet(this.street); + address.setZipcode(this.zipcode); + return address; + } +} diff --git a/core-java/src/main/java/com/baeldung/arraycopy/model/Employee.java b/core-java/src/main/java/com/baeldung/arraycopy/model/Employee.java new file mode 100644 index 0000000000..757a8f8ec1 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/arraycopy/model/Employee.java @@ -0,0 +1,25 @@ +package com.baeldung.arraycopy.model; + +import java.io.Serializable; + +public class Employee implements Serializable { + private static final long serialVersionUID = -2454619097207585825L; + private int id; + private String name; + + public int getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } +} diff --git a/core-java/src/test/java/com/baeldung/arraycopy/ArrayCopyUtilTest.java b/core-java/src/test/java/com/baeldung/arraycopy/ArrayCopyUtilTest.java new file mode 100644 index 0000000000..2c9a97c496 --- /dev/null +++ b/core-java/src/test/java/com/baeldung/arraycopy/ArrayCopyUtilTest.java @@ -0,0 +1,163 @@ +package com.baeldung.arraycopy; + +import com.baeldung.arraycopy.model.Address; +import com.baeldung.arraycopy.model.Employee; +import org.apache.commons.lang3.SerializationUtils; +import org.junit.Assert; +import org.junit.BeforeClass; +import org.junit.Test; + +import java.util.Arrays; + +public class ArrayCopyUtilTest { + private static Employee[] employees; + private static final int MAX = 2; + + @BeforeClass + public static void setup(){ + employees = new Employee[MAX]; + Employee employee; + for(int i = 0; i < MAX; i++) { + employee = new Employee(); + employee.setName("Emp"+i); + employee.setId(i); + employees[i] = employee; + } + } + + @Test + public void givenArrayOfPrimitiveType_whenCopiedViaSystemsArrayCopy_thenSuccessful(){ + int[] array = {23, 43, 55}; + int[] copiedArray = new int[3]; + + System.arraycopy(array, 0, copiedArray, 0, 3); + + Assert.assertTrue(array.length == copiedArray.length); + Assert.assertTrue(copiedArray[0] == array[0]); + Assert.assertTrue(copiedArray[1] == array[1]); + Assert.assertTrue(copiedArray[2] == array[2]); + } + + @Test + public void givenArrayOfPrimitiveType_whenCopiedSubSequenceViaSystemsArrayCopy_thenSuccessful(){ + int[] array = {23, 43, 55, 12, 65, 88, 92}; + int[] copiedArray = new int[3]; + + System.arraycopy(array, 2, copiedArray, 0, 3); + + Assert.assertTrue(3 == copiedArray.length); + Assert.assertTrue(copiedArray[0] == array[2]); + Assert.assertTrue(copiedArray[1] == array[3]); + Assert.assertTrue(copiedArray[2] == array[4]); + } + + @Test + public void givenArrayOfPrimitiveType_whenCopiedSubSequenceViaArraysCopyOfRange_thenSuccessful(){ + int[] array = {23, 43, 55, 12, 65, 88, 92}; + + int[] copiedArray = Arrays.copyOfRange(array, 1, 4); + + Assert.assertTrue(3 == copiedArray.length); + Assert.assertTrue(copiedArray[0] == array[1]); + Assert.assertTrue(copiedArray[1] == array[2]); + Assert.assertTrue(copiedArray[2] == array[3]); + } + + @Test + public void givenArrayOfPrimitiveType_whenCopiedViaArraysCopyOf_thenValueChangeIsSuccessful(){ + int[] array = {23, 43, 55, 12}; + int newLength = array.length; + + int[] copiedArray = Arrays.copyOf(array, newLength); + + Assert.assertNotNull(copiedArray); + Assert.assertTrue(copiedArray.length == array.length); + Assert.assertTrue(copiedArray[0] == array[0]); + Assert.assertTrue(copiedArray[1] == array[1]); + Assert.assertTrue(copiedArray[2] == array[2]); + Assert.assertTrue(copiedArray[3] == array[3]); + array[0] = 9; + Assert.assertTrue(copiedArray[0] != array[0]); + copiedArray[1] = 12; + Assert.assertTrue(copiedArray[1] != array[1]); + } + + @Test + public void givenArrayOfNonPrimitiveType_whenCopiedViaArraysCopyOf_thenDoShallowCopy(){ + Employee[] copiedArray = Arrays.copyOf(employees, employees.length); + + Assert.assertNotNull(copiedArray); + Assert.assertTrue(copiedArray.length == employees.length); + employees[0].setName(employees[0].getName()+"_Changed"); + //change in employees' element caused change in the copied array + Assert.assertTrue(copiedArray[0].getName().equals(employees[0].getName())); + } + + @Test + public void givenArrayOfPrimitiveType_whenCopiedViaArrayClone_thenValueChangeIsSuccessful(){ + int[] array = {23, 43, 55, 12}; + + int[] copiedArray = array.clone(); + + Assert.assertNotNull(copiedArray); + Assert.assertTrue(copiedArray.length == array.length); + Assert.assertTrue(copiedArray[0] == array[0]); + Assert.assertTrue(copiedArray[1] == array[1]); + Assert.assertTrue(copiedArray[2] == array[2]); + Assert.assertTrue(copiedArray[3] == array[3]); + array[0] = 9; + Assert.assertTrue(copiedArray[0] != array[0]); + copiedArray[1] = 12; + Assert.assertTrue(copiedArray[1] != array[1]); + } + + @Test + public void givenArraysOfNonPrimitiveType_whenCopiedViaArrayClone_thenDoShallowCopy(){ + Employee[] copiedArray = employees.clone(); + + Assert.assertNotNull(copiedArray); + Assert.assertTrue(copiedArray.length == employees.length); + employees[0].setName(employees[0].getName()+"_Changed"); + //change in employees' element changed the copied array + Assert.assertTrue(copiedArray[0].getName().equals(employees[0].getName())); + } + + @Test + public void givenArraysOfCloneableNonPrimitiveType_whenCopiedViaArrayClone_thenDoShallowCopy(){ + Address[] addresses = createAddressArray(); + + Address[] copiedArray = addresses.clone(); + + Assert.assertNotNull(copiedArray); + Assert.assertTrue(copiedArray.length == addresses.length); + addresses[0].setCity(addresses[0].getCity()+"_Changed"); + Assert.assertTrue(copiedArray[0].getCity().equals(addresses[0].getCity())); + } + + @Test + public void givenArraysOfSerializableNonPrimitiveType_whenCopiedViaSerializationUtils_thenDoDeepCopy(){ + Employee[] copiedArray = SerializationUtils.clone(employees); + + Assert.assertNotNull(copiedArray); + Assert.assertTrue(copiedArray.length == employees.length); + employees[0].setName(employees[0].getName()+"_Changed"); + //change in employees' element didn't change in the copied array + Assert.assertFalse(copiedArray[0].getName().equals(employees[0].getName())); + } + + private Address[] createAddressArray(){ + Address[] addresses = new Address[1]; + addresses[0] = createAddress(); + return addresses; + } + + private Address createAddress() { + Address address = new Address(); + address.setCountry("USA"); + address.setState("CA"); + address.setCity("San Francisco"); + address.setStreet("Street 1"); + address.setZipcode("59999"); + return address; + } +}