Презентация на тему Ввод - вывод. Сериализация

ObjectOutput, ObjectStreamConstants{

public ObjectOutputStream(OutputStream out)

public void writeObject(Object obj)

public void write(int b)
public void write(byte b[])
public void write(byte b[], int off, int len)

public final void writeBoolean(boolean v)
public final void writeByte(int v)
public final void writeShort(int v)
public final void writeChar(int v)
public final void writeInt(int v)
public final void writeLong(long v)
public final void writeFloat(float v)
public final void writeDouble(double v)

public final void writeBytes(String s)
public final void writeChars(String s)
public final void writeUTF(String str)

public void flush()
public void close()
}

C

public void writeObject(Object obj)

public ObjectOutputStream(OutputStream out)

ObjectInput, ObjectStreamConstants {

public ObjectInputStream(InputStream in)

public

final Object readObject()

public int read()
public int read(byte b[], int off, int len)

public final boolean readBoolean()
public final byte readByte()
public final short readShort()
public final int readInt()
public final long readLong()
public final float readFloat()
public final double readDouble()
public final String readUTF()

}

public final Object readObject()

public ObjectInputStream(InputStream in)

C

Employee() {
System.out.println("Employee object is being created

using a default constructor");
}

public Employee(String name, short yearOfBirth, char gender,
boolean isMarried, int salary) {

this.name = name;
this.yearOfBirth = yearOfBirth;
this.gender = gender;
this.isMarried = isMarried;
this.salary = salary;

numEmployees++;
System.out.println("Employee object is being created using a constructor");
}

public String toString() {
return "Employee [name=" + name + ", yearOfBirth=" + yearOfBirth
+ ", gender=" + gender + ", isMarried=" + isMarried + ", salary="
+ salary + "]";
}

public static int getNumEmployees(){
return numEmployees;
}

private String name;
private short yearOfBirth;
private char gender;
private boolean isMarried;
private int salary;

private static int numEmployees = 0;
}

main(String[] args) {

Employee

bob = new Employee("Robert", (short) 1987, 'M', true, 30000);
System.out.println(bob);
System.out.println("Total number of employees: " + Employee.getNumEmployees());

FileOutputStream fos = null;
ObjectOutputStream oos = null;

try {
fos = new FileOutputStream("I:\\FileIO\\employee.dat");
oos = new ObjectOutputStream(fos);
oos.writeObject(bob);
System.out.println("Employee object was serialized");

} catch (IOException e) {
System.out.println("An I/O error occured");
} finally {
try {
if (oos != null)
oos.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

Employee object is being created using a constructor
Employee [name=Robert, yearOfBirth=1987, gender=M, isMarried=true, salary=30000]
Total number of employees: 1
Employee object was serialized

Total number of employees: 1

Employee object is being created using a constructor

args) {

FileInputStream fis = null;

ObjectInputStream ois = null;

try {

fis = new FileInputStream("I:\\FileIO\\employee.dat");
ois = new ObjectInputStream(fis);

Employee emp = (Employee) ois.readObject();
System.out.println(emp);
System.out.println("Total number of employees: " + Employee.getNumEmployees());

} catch (IOException e) {
System.out.println("An I/O error occured");
} catch (ClassNotFoundException e) {
System.out.println("Class was not found");
}
finally {
try {
if (ois != null)
ois.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

Employee [name=Robert, yearOfBirth=1987, gender=M, isMarried=true, salary=30000]
Total number of employees: 0

Total number of employees: 0

public Person(String name) {
this.name =

name;
System.out.println("Person constructor is called, name=" + name);
}

public Person() {
this.name = "A person";
System.out.println("Person parameterless constructor is called, name="
+ name);
}

public String getName() {
return name;
}

public void setSpouse(Person value) {
spouse = value;
}

public Person getSpouse() {
return spouse;
}

public String toString() {
return "[Person: name=" + name + " spouse=" + spouse.getName() + "]";
}

private String name;
private Person spouse;
}

main(String[] args) {

Person ann = new

Person("Ann");
Person bob = new Person("Bob");
ann.setSpouse(bob);
bob.setSpouse(ann);

System.out.println(ann);
System.out.println(bob);

FileOutputStream fos = null;
ObjectOutputStream oos = null;

try {
fos = new FileOutputStream("I:\\FileIO\\person.dat");
oos = new ObjectOutputStream(fos);

oos.writeObject(ann);

} catch (IOException e) {
System.out.println("An I/O error occured");
} finally {
try {
if (oos != null)
oos.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

name=Bob
[Person: name=Ann spouse=Bob]
[Person: name=Bob spouse=Ann]

args) {

FileInputStream fis = null;

ObjectInputStream ois = null;

try {

fis = new FileInputStream("I:\\FileIO\\person.dat");
ois = new ObjectInputStream(fis);

Person ann = (Person) ois.readObject();
System.out.println(ann);
System.out.println(ann.getSpouse());

} catch (IOException e) {
System.out.println("An I/O error occured");
} catch (ClassNotFoundException e) {
System.out.println("Class was not found");
}
finally {
try {
if (ois != null)
ois.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

[Person: name=Ann spouse=Bob]
[Person: name=Bob spouse=Ann]

public Salesman(String n, double s) {

name = n;
salary = s;
}

public String getName() {
return name;
}

public double getSalary() {
return salary;
}

public String toString() {
return getClass().getSimpleName() + "[name=" + name + ",salary=" + salary
+ ",bonus=" + bonus + "]";
}

public void setBonus(double bonus) {
this.bonus = bonus;
}

private String name;
private double salary;

private transient double bonus;
}

main(String[] args) {


Salesman

bob = new Salesman("Robert", 30000);
bob.setBonus(10000);
System.out.println(bob);

FileOutputStream fos = null;
ObjectOutputStream oos = null;

try {
fos = new FileOutputStream("I:\\FileIO\\salesman.dat");
oos = new ObjectOutputStream(fos);

oos.writeObject(bob);

} catch (IOException e) {
System.out.println("An I/O error occured");
} finally {
try {
if (oos != null)
oos.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

Salesman[name=Robert,salary=30000.0,bonus=10000.0 ]

bonus=10000.0

args) {

FileInputStream fis = null;

ObjectInputStream ois = null;

try {

fis = new FileInputStream("I:\\FileIO\\salesman.dat");
ois = new ObjectInputStream(fis);

Salesman bob = (Salesman) ois.readObject();
System.out.println(bob);

} catch (IOException e) {
System.out.println("An I/O error occured");
} catch (ClassNotFoundException e) {
System.out.println("Class was not found");
}
finally {
try {
if (ois != null)
ois.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

Salesman[name=Robert,salary=30000.0,bonus=0.0 ]

bonus=0.0

Volume Serial Number is 44AB-CB89

Directory of I:\item

02/21/2013 12:14

PM .
02/21/2013 12:14 PM ..
02/21/2013 12:11 PM 476 ItemUID.java
1 File(s) 476 bytes
2 Dir(s) 48,619,651,072 bytes free

I:\item>javac ItemUID.java

I:\item>dir
Volume in drive I has no label.
Volume Serial Number is 44AB-CB89

Directory of I:\item

02/21/2013 12:16 PM .
02/21/2013 12:16 PM ..
02/21/2013 12:16 PM 752 ItemUID.class
02/21/2013 12:11 PM 476 ItemUID.java
2 File(s) 1,228 bytes
2 Dir(s) 48,619,646,976 bytes free

I:\item>serialver ItemUID
ItemUID: static final long serialVersionUID = -3358310746251373045L;

I:\item>

Получение UID

private static final long serialVersionUID = 5210454654602398740L;

public ItemUID(String name, int number) {
this.name = name;
this.number = number;
}

public String getName() {
return name;
}

public int getNumber() {
return number;
}

public String toString() {
return "[name=" + name + ", number=" + number + "]";
}

private String name;
private int number;
}

main(String[] args) {

ItemUID coffemaker = new

ItemUID("Coffemaker", 2912);
System.out.println(coffemaker);

FileOutputStream fos = null;
ObjectOutputStream oos = null;

try {
fos = new FileOutputStream("I:\\FileIO\\item.dat");
oos = new ObjectOutputStream(fos);

oos.writeObject(coffemaker);

} catch (IOException e) {
System.out.println("An I/O error occured");
} finally {
try {
if (oos != null)
oos.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

[name=Coffemaker, number=2912]

Serializable{

private static final long serialVersionUID

= 5210454654602398740L;

public ItemUID(String name, int number, String description) {
this.name = name;
this.number = number;
this.description = description;
}

public String getName() {
return name;
}

public int getNumber() {
return number;
}

public String toString() {
return "[name=" + name + ", number=" + number + ", description=" + description+"]";
}

private String name;
private int number;
private String description;
}

args) {

FileInputStream fis = null;

ObjectInputStream ois = null;

try {

fis = new FileInputStream("I:\\FileIO\\item.dat");
ois = new ObjectInputStream(fis);

ItemUID item = (ItemUID) ois.readObject();
System.out.println(item);

} catch (IOException e) {
System.out.println("An I/O error occured");
} catch (ClassNotFoundException e) {
System.out.println("Class was not found");
}
finally {
try {
if (ois != null)
ois.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

[name=Coffemaker, number=2912, description=null]

implements Serializable {

private transient int size =

0;
private transient String buf[] = new String[16];

public void add(String s) {
buf[size] = s;
size++;
}

public String toString() {

StringBuffer b = new StringBuffer();
for (int i=0; i b.append(buf[i]);
b.append(" ");
}
return b.toString();
}

private void writeObject(ObjectOutputStream s) throws IOException {

s.defaultWriteObject();
s.writeInt(size);
for (int i=0; i s.writeObject(buf[i]);
}

private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {

s.defaultReadObject();
int size = s.readInt();
for (int i = 0; i < size; i++)
add((String)s.readObject());
}
}

main(String[] args) {

StringLinkedList

sList = new StringLinkedList();
sList.add("apple");
sList.add("orange");
sList.add("banana");
System.out.println("List contents are: " + sList);

FileOutputStream fos = null;
ObjectOutputStream oos = null;

try {
fos = new FileOutputStream("I:\\FileIO\\fruitlist.dat");
oos = new ObjectOutputStream(fos);

System.out.println("Serializing .....");
oos.writeObject(sList);

} catch (IOException e) {
System.out.println("An I/O error occured");
} finally {
try {
if (oos != null)
oos.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

List contents are: banana orange apple
Serializing .....

args) {

FileInputStream fis = null;

ObjectInputStream ois = null;

try {

fis = new FileInputStream("I:\\FileIO\\fruitlist.dat");
ois = new ObjectInputStream(fis);

System.out.println("Deserializing .....");
StringLinkedList sList = (StringLinkedList) ois.readObject();
System.out.println("List contents are: " + sList);

} catch (IOException e) {
System.out.println("An I/O error occured");
} catch (ClassNotFoundException e) {
System.out.println("Class was not found");
}
finally {
try {
if (ois != null)
ois.close();
} catch (IOException e) {
System.out.println("Error closing file");
}
}
}
}

Deserializing .....
List contents are: apple orange banana