3. Essential Java Classes 5. Some Useful Classes - презентация, доклад, проект скачать

Нажмите для полного просмотра!

3. Essential Java Classes 5. Some Useful Classes, слайд №1

3. Essential Java Classes 5. Some Useful Classes, слайд №2

3. Essential Java Classes 5. Some Useful Classes, слайд №3

3. Essential Java Classes 5. Some Useful Classes, слайд №4

3. Essential Java Classes 5. Some Useful Classes, слайд №5

3. Essential Java Classes 5. Some Useful Classes, слайд №6

3. Essential Java Classes 5. Some Useful Classes, слайд №7

3. Essential Java Classes 5. Some Useful Classes, слайд №8

3. Essential Java Classes 5. Some Useful Classes, слайд №9

3. Essential Java Classes 5. Some Useful Classes, слайд №10

3. Essential Java Classes 5. Some Useful Classes, слайд №11

3. Essential Java Classes 5. Some Useful Classes, слайд №12

3. Essential Java Classes 5. Some Useful Classes, слайд №13

Содержание ▲

Вы можете ознакомиться и скачать презентацию на тему 3. Essential Java Classes 5. Some Useful Classes. Доклад-сообщение содержит 13 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

Слайды и текст этой презентации

Слайд 1

Описание слайда:

3. Essential Java Classes 5. Some Useful Classes

Слайд 2

Описание слайда:

Class System (1 of 2) contains several useful class fields and methods it cannot be instantiated standard input, standard output, and error output streams gets and sets system properties

Слайд 3

Описание слайда:

Class System (2 of 2) exit(int status) - terminates the currently running Java Virtual Machine gc() - runs the garbage collector arraycopy(…) - copies an array console() - Returns the unique Console object associated with the current JVM nanoTime() - Returns the current value of the running JVM high-resolution time See for details

Слайд 4

Описание слайда:

Class Runtime Allows to interface with the environment in which the application is running static getRuntime() - Returns the runtime object associated with the current Java application freeMemory() - returns the amount of free memory in the JVM totalMemory() - returns the total amount of memory in the JVM.

Слайд 5

$Example of String Command Execution Runtime r = Runtime.getRuntime(); try{ r.exec("C:\\Program Files\\Mozilla Firefox\\firefox.exe"); }...$

Описание слайда:

Example of String Command Execution Runtime r = Runtime.getRuntime(); try{ r.exec("C:\\Program Files\\Mozilla Firefox\\firefox.exe"); } catch(Exception ex){ System.out.println(ex.getMessage()); }

Слайд 6

Описание слайда:

Class Properties represents a persistent set of properties as pairs of key-value details are here:

Слайд 7

Описание слайда:

Configuration File Example dbpassword=pass&word database=localhost dbuser=vmo

Слайд 8

Описание слайда:

Use Properties Example Properties applicationProps = new Properties(); in = new FileInputStream("appProperties"); applicationProps.load(in); in.close(); String dbInfo = applicationProps. getProperty("database");

Слайд 9

Описание слайда:

Class Object (1 of 2) The root of the class hierarchy Every class has Object as a superclass All objects, including arrays, implement the methods of this class See for details

Слайд 10

Описание слайда:

Class Object (2 of 2) equals(Object obj) - indicates whether some other object is "equal to" this one getClass() - returns the runtime class of this Object clone() - creates and returns a copy of this object toString() - returns a string representation of the object

Слайд 11

Описание слайда:

Class Random is used to generate a stream of pseudorandom numbers Random(long seed) - creates a new random number generator nextInt() - returns the next pseudorandom, uniformly distributed int value nextInt(int n) - returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive) See for details

Слайд 12

Описание слайда:

Class Math (1 of 2) Contains methods for performing basic numeric operations: elementary exponential, logarithm, square root trigonometric functions See for details

Слайд 13

Описание слайда:

Class Math (2 of 2) sqtr(double value) exp(double value) log(double value) power(double value, double p) sin(double value) sinh(double value) toRadians(double value)