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3. Essential Java Classes 5. Some Useful Classes

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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

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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 http://docs.oracle.com/javase/7/docs/api/java/lang/System.html for details

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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.

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

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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()); }

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Class Properties represents a persistent set of properties as pairs of key-value details are here: http://docs.oracle.com/javase/tutorial/essential/environment/properties.html http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html

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

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

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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 http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html for details

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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

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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 http://docs.oracle.com/javase/7/docs/api/java/util/Random.html for details

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Class Math (1 of 2) Contains methods for performing basic numeric operations: elementary exponential, logarithm, square root trigonometric functions See http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html for details

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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)