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Java Articles
Page 6 of 450
Why do we need generics in Java?
Reference typesAs we know a class is a blue print in which we define the required behaviors and properties and, an interface is similar to class but it is a Specification (containing abstract methods).These are also considered as datatypes in Java, unlike other primitive datatypes a literal of these kind of types points/refers to the location of the object. They are also known as reference types.GenericsGenerics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the ...
Read MoreDifference Between Daemon Threads and User Threads In Java
As we know java is a language that supports multi threading and on the basis of nature threads in java are classified into two types Daemon thread and User thread.The following are the important differences between Daemon Threads and User Threads.Sr. No.KeyDaemon ThreadsUser Threads1NatureDaemon thread is low in priority i.e JVM does not care much about these types of threads.User threads are recognized as high priority thread i.e. JVM will wait for any active user thread to get completed.2CPU availabilityIt is not guaranteed that Daemon thread always gets CPU usage whenever it requires due to its low priority.User thread always ...
Read MoreMatching Nonprintable Characters using Java regex
There are 7 common non printable characters used in general and each character has its own hexadecimal representation.NamecharactersHexa-decimal representationbell\a0x07Escape\e0x1BForm feed\f0x0CLine feed0x0ACarriage return\r0X0DHorizontal tab\t0X09Vertical tab\v0X0BExample 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample1 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter input text: "); String input = sc.nextLine(); String regex = "\x09"; //Creating a pattern object Pattern pattern = Pattern.compile(regex); //Matching the compiled pattern in the String Matcher matcher = ...
Read MoreIncremental Java infinite loop
ExampleFollowing is the required program −public class Tester { public static void main(String args[]) { int i = 0; do { i++; System.out.println(i); }while (true); } }The output will keep printing numbers in sequential order.
Read MoreIncremental Java infinite loop
ExampleFollowing is the required program −public class Tester { public static void main(String args[]) { int i = 0; do { i++; System.out.println(i); }while (true); } }The output will keep printing numbers in sequential order.
Read MoreHow is down-casting possible in Java?
Yes, a variable can be downcast to its lower range substitute by casting. It may lead to data loss although. See the example below −Examplepublic class Tester { public static void main(String[] args) { int a = 300; byte b = (byte)a; System.out.println(b); } }OutputIt will print output as −44
Read MoreHow is down-casting possible in Java?
Yes, a variable can be downcast to its lower range substitute by casting. It may lead to data loss although. See the example below −Examplepublic class Tester { public static void main(String[] args) { int a = 300; byte b = (byte)a; System.out.println(b); } }OutputIt will print output as −44
Read MoreHow to import java.lang.String class in Java?
To import any package in the current class you need to use the import keyword asimport packagename;Exampleimport java.lang.String; public class Sample { public static void main(String args[]) { String s = new String("Hello"); System.out.println(s); } }OutputHello
Read MoreString Concatenation by concat() method.
You can concatenate two strings using the concat() method of the String class. This class concatenates the specified string to the end of this string.Examplepublic class Test { public static void main(String args[]){ String str1 = "Krishna"; String str2 = "Kasyap"; System.out.println(str1.concat(str2)); } }OutputkrishnaKasyap
Read MoreLocal variables in Java
Local variables are declared in methods, constructors, or blocks.Local variables are created when the method, constructor or block is entered and the variable will be destroyed once it exits the method, constructor, or block.Access modifiers cannot be used for local variables.Local variables are visible only within the declared method, constructor, or block.Local variables are implemented at stack level internally.There is no default value for local variables, so local variables should be declared and an initial value should be assigned before the first use.ExampleHere, age is a local variable. This is defined inside pupAge()method and its scope is limited to only ...
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