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Java Articles
Page 111 of 450
Assigning values to static final variables in java
In java, a non-static final variable can be assigned a value at two places.At the time of declaration.In constructor.Examplepublic class Tester { final int A; //Scenario 1: assignment at time of declaration final int B = 2; public Tester() { //Scenario 2: assignment in constructor A = 1; } public void display() { System.out.println(A + ", " + B); } public static void main(String[] args) { Tester tester = new Tester(); ...
Read MoreSleeping for a while in Java
You can sleep for any period of time from one millisecond up to the lifetime of your computer. For example, the following program would sleep for 3 seconds −Exampleimport java.util.*; public class SleepDemo { public static void main(String args[]) { try { System.out.println(new Date( ) + ""); Thread.sleep(5*60*10); System.out.println(new Date( ) + ""); } catch (Exception e) { System.out.println("Got an exception!"); } } }This will produce the following result −OutputSun May 03 18:04:41 GMT 2009 Sun May 03 18:04:51 GMT 2009
Read MoreSleeping for a while in Java
You can sleep for any period of time from one millisecond up to the lifetime of your computer. For example, the following program would sleep for 3 seconds −Exampleimport java.util.*; public class SleepDemo { public static void main(String args[]) { try { System.out.println(new Date( ) + ""); Thread.sleep(5*60*10); System.out.println(new Date( ) + ""); } catch (Exception e) { System.out.println("Got an exception!"); } } }This will produce the following result −OutputSun May 03 18:04:41 GMT 2009 Sun May 03 18:04:51 GMT 2009
Read MoreDate Parsing using SimpleDateFormat
The SimpleDateFormat class has parse() method, which tries to parse a string according to the format stored in the given SimpleDateFormat object.Exampleimport java.util.*; import java.text.*; public class DateDemo { public static void main(String args[]) { SimpleDateFormat ft = new SimpleDateFormat ("yyyy-MM-dd"); String input = args.length == 0 ? "1818-11-11" : args[0]; System.out.print(input + " Parses as "); Date t; try { t = ft.parse(input); System.out.println(t); } catch (ParseException e) { System.out.println("Unparseable using " + ft); } } }A sample run of the above program would produce the following result −Output1818-11-11 Parses as Wed Nov 11 00:00:00 EST 1818
Read MoreDate Parsing using SimpleDateFormat
The SimpleDateFormat class has parse() method, which tries to parse a string according to the format stored in the given SimpleDateFormat object.Exampleimport java.util.*; import java.text.*; public class DateDemo { public static void main(String args[]) { SimpleDateFormat ft = new SimpleDateFormat ("yyyy-MM-dd"); String input = args.length == 0 ? "1818-11-11" : args[0]; System.out.print(input + " Parses as "); Date t; try { t = ft.parse(input); System.out.println(t); } catch (ParseException e) { System.out.println("Unparseable using " + ft); } } }A sample run of the above program would produce the following result −Output1818-11-11 Parses as Wed Nov 11 00:00:00 EST 1818
Read MoreCoupling in Java
Coupling refers to the usage of an object by another object. It can also be termed as collaboration. This dependency of one object on another object to get some task done can be classified into the following two types −Tight coupling - When an object creates the object to be used, then it is a tight coupling situation. As the main object creates the object itself, this object can not be changed from outside world easily marked it as tightly coupled objects.Loose coupling - When an object gets the object to be used from the outside, then it is a loose coupling ...
Read MoreCoupling in Java
Coupling refers to the usage of an object by another object. It can also be termed as collaboration. This dependency of one object on another object to get some task done can be classified into the following two types −Tight coupling - When an object creates the object to be used, then it is a tight coupling situation. As the main object creates the object itself, this object can not be changed from outside world easily marked it as tightly coupled objects.Loose coupling - When an object gets the object to be used from the outside, then it is a loose coupling ...
Read MoreCopyOnWriteArraySet Class in Java
Class declarationpublic class CopyOnWriteArraySet extends AbstractSet implements SerializableCopyOnWriteArraySet class uses CopyOnWriteArrayList internally for all of its operations and thus possesses the basic properties of CopyOnWriteArrayList.CopyOnWriteArraySet is a thread-safe.CopyOnWriteArraySet is to be used in Thread based environment where read operations are very frequent and update operations are rare.Iterator of CopyOnWriteArraySet will never throw ConcurrentModificationException.Any type of modification to CopyOnWriteArraySet will not reflect during iteration since the iterator was created.Set modification methods like remove, set and add are not supported in the iteration. This method will throw UnsupportedOperationException.CopyOnWriteArraySet MethodsFollowing is the list of important methods available in the CopyOnWriteArraySet class.Sr.No.Method & ...
Read MoreCopyOnWriteArraySet Class in Java
Class declarationpublic class CopyOnWriteArraySet extends AbstractSet implements SerializableCopyOnWriteArraySet class uses CopyOnWriteArrayList internally for all of its operations and thus possesses the basic properties of CopyOnWriteArrayList.CopyOnWriteArraySet is a thread-safe.CopyOnWriteArraySet is to be used in Thread based environment where read operations are very frequent and update operations are rare.Iterator of CopyOnWriteArraySet will never throw ConcurrentModificationException.Any type of modification to CopyOnWriteArraySet will not reflect during iteration since the iterator was created.Set modification methods like remove, set and add are not supported in the iteration. This method will throw UnsupportedOperationException.CopyOnWriteArraySet MethodsFollowing is the list of important methods available in the CopyOnWriteArraySet class.Sr.No.Method & ...
Read MoreCopyOnWriteArrayList Class in Java
Class declarationpublic class CopyOnWriteArrayList extends Object implements List, RandomAccess, Cloneable, SerializableCopyOnWriteArrayList is a thread-safe variant of ArrayList where operations which can change the ArrayList (add, update, set methods) creates a clone of the underlying array.CopyOnWriteArrayList is to be used in a Thread based environment where read operations are very frequent and update operations are rare.Iterator of CopyOnWriteArrayList will never throw ConcurrentModificationException.Any type of modification to CopyOnWriteArrayList will not reflect during iteration since the iterator was created.List modification methods like remove, set and add are not supported in the iteration. This method will throw UnsupportedOperationException.null can be added to the ...
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