Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Articles by Venkata Sai
45 articles
Java program for Multiplication of Array elements
To find the product of elements of an array.create an empty variable. (product)Initialize it with 1.In a loop traverse through each element (or get each element from user) multiply each element to product.Print the product.Example Live Demoimport java.util.Arrays; import java.util.Scanner; public class ProductOfArrayOfElements { public static void main(String args[]){ System.out.println("Enter the required size of the array :: "); Scanner s = new Scanner(System.in); int size = s.nextInt(); int myArray[] = new int [size]; int product = 1; System.out.println("Enter the elements of the ...
Read MoreCan we serialize static variables in Java?
In Java, serialization is a concept using which we can write the state of an object into a byte stream so that we can transfer it over the network (using technologies like JPA and RMI).But, static variables belong to class therefore, you cannot serialize static variables in Java. Still if you try to do so, the program gets compiled successfully but it raises an exception at the time of execution.In the following java program, the class Student has a static variable and we are trying to serialize and desterilize its object in the another class named ExampleSerialize.Exampleimport java.io.FileInputStream; import java.io.FileOutputStream; ...
Read MoreExplain how to remove Leading Zeroes from a String in Java
Whenever you read an integer value into a String, you can remove leading zeroes of it using StringBuffer class, using regular expressions or, by converting the given String to character array.Converting to character arrayFollowing Java program reads an integer value from the user into a String and removes the leading zeroes from it by converting the given String into Character array.Exampleimport java.util.Scanner; public class LeadingZeroes { public static String removeLeadingZeroes(String num){ int i=0; char charArray[] = num.toCharArray(); for( ; i
Read MoreCan we cast reference variables in Java?
Java provides various datatypes to store various data values. It provides 7 primitive datatypes (stores single values) namely, boolean, byte, char, short, int, long, float, double and, reference datatypes (arrays and objects).Casting in JavaConverting one primitive data type into another is known as type casting.Exampleimport java.util.Scanner; public class TypeCastingExample { public static void main(String args[]){ Scanner sc = new Scanner(System.in); System.out.println("Enter an integer value: "); int i = sc.nextInt(); long num = i; System.out.println("Value of the given integer: "+num); } }OutputEnter an integer ...
Read MoreWhat are the modifiers allowed for methods in an Interface in java?
An interface in Java is a specification of method prototypes. Whenever you need to guide the programmer or, make a contract specifying how the methods and fields of a type should be you can define an interface.In Java 7As of Java7 you can have only public, abstract as modifiers for the methods of an interface.interface MyInterface{ public abstract void display(); public abstract void setName(String name); public abstract void setAge(int age); }Using any other modifier with the methods of an interface would lead to a compile time error.From Java8From Java8 onwards interfaces ...
Read MoreDoes Java support multiple inheritance? Why? How can we resolve this?
Whenever, you extend a class a copy of superclass’s members is available to the subclass object and, when you can call the method of the superclass using the object of the subclass.ExampleIn the following example, we have a class named SuperClass with a method with name demo(). We are extending this class with another class (SubClass).Now, you create an object of the subclass and call the method demo(). Live Democlass SuperClass{ public void demo() { System.out.println("demo method"); } } public class SubClass extends SuperClass { public ...
Read MoreCan we cast an object reference to an interface reference in java? If so when?
Yes, you can.If you implement an interface and provide body to its methods from a class. You can hold object of the that class using the reference variable of the interface i.e. cast an object reference to an interface reference.But, using this you can access the methods of the interface only, if you try to access the methods of the class a compile time error is generated.ExampleIn the following Java example, we have an interface named MyInterface with an abstract method display().We have a class with name InterfaceExample with a method (show()). In addition to it, we are implementing the ...
Read MoreExplain restrictions on using enum in java?\\n
Enumeration (enum) in Java is a datatype which stores a set of constant values. You can use enumerations to store fixed values such as days in a week, months in a year etc.You can define an enumeration using the keyword enum followed by the name of the enumeration as −enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }Points to keep in mindYou need to keep the following points in mind while declaring an enum −It is recommended to write the name of the constants in all capital letters as −public class EnumerationExample { enum Days { ...
Read MoreCan we have variables and methods in an enum in Java?
Enumeration (enum) in Java is a datatype which stores a set of constant values. You can use enumerations to store fixed values such as days in a week, months in a year etc.You can define an enumeration using the keyword enum followed by the name of the enumeration as −enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }Methods and variables in an enumerationEnumerations are similar to classes and, you can have variables, methods, and constructors within them. Only concrete methods are allowed in an enumeration.ExampleIn the following example, we are defining an enumeration with name ...
Read MoreCan we create an enum with custom values in java?
Enumeration (enum) in Java is a datatype which stores a set of constant values (Strings in general). You can use enumerations to store fixed values such as days in a week, months in a year etc.enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }Custom values to the constantsInstead of declaring just string constants in an enum, you can also have values to these constants as −enum Vehicles { ACTIVA125(80000), ACTIVA5G(70000), ACCESS125(75000), VESPA(90000), TVSJUPITER(75000); }Whenever, you need to assign custom values to the constants of an enum −To hold the value of each ...
Read More