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Programming Articles
Page 1626 of 2547
How do I get length of list of lists in Java?
In Java, a list is a collection that we use for storing elements. In many cases, we need to get the length of a list of lists. In this article, we will learn how to get the length of a list of lists in Java. List provides a method size() to get the count of elements present in the current list. To get the size of each list, we can iterate through each item in the list and add its size to get the count of all elements present in the list of lists. Ways to Get the Length of ...
Read MoreHow do you create a list with values in Java?
A List is a Collection in Java that is used for storing elements in sequence. In this article, we will be learning how to create a list with values in Java. Ways to Create a List with Values in Java There are various ways to create a list with values in Java. Below are the different approaches: Using Arrays.asList() method Using Stream.of() method Using List.of() method Using Arrays.asList() method The Arrays.asList() method returns the elements of the current array in the form of a List. This method ...
Read MoreCan we declare a constructor as private in Java?
Java constructor is a special method used to initialize objects. It has the same name as the class and is automatically called when an object is created. You can also declare a constructor as private to restrict object creation from outside the class. What is a Private Constructor? A private constructor is a constructor that is declared using the private access modifier. It restricts object creation from outside the class i.e., the class having a private constructor cannot be subclassed. Private constructors are used in design patterns like Singleton, or to prevent subclassing or instantiation. Purpose of a Private ...
Read MoreHow do you get the index of an element in a list in Java?
List is a collection in Java that allows us to store elements. In this article, we will learn how to get the index of an element in a List in Java. We have various ways to get the index of an element in a List in Java. They are - Using the indexOf() method Using a for loop Using Stream API Using the indexOf() method The indexOf() method returns the index of the first occurrence of the specified element in this list, or -1 if this ...
Read MoreCan we define a method name same as class name in Java?
A method is a collection of statements that are grouped together to perform an operation. In Java, you can define a method having the same name as the class but it is not recommended as per the coding standard. Can We define a Method Having Same as Class? Yes, It is allowed to define a method with the same name as that of a class. There is no compile-time or runtime error will occur. But this is not recommended as per coding standards in Java. Normally the constructor name and class name always the same in Java. Example of a ...
Read MoreJava Program to Implement Multiple Inheritance
In this article, we will understand how to implement multiple inheritance. Unlike other programming languages, such as C++, Java does not support multiple inheritance through classes. This means that a class cannot inherit from more than one class. But why? Let's understand first what multiple inheritance is and why it is so. Multiple Inheritance Multiple Inheritance is one of the features of object-oriented programming, where a class (child class) can inherit properties of more than one class (parent class) using the extends keyword. But Java does not support this to avoid complexity and ambiguity. It can ...
Read MoreJava Program to Calculate Simple Interest
In this article, we will understand how to write a Java program to calculate simple interest. But, before doing it, let's understand how we calculate simple interest mathematically. The simple interest is a way to determine the amount of interest gained on a principal amount at the specified interest rate for a given time. Unlike compound interest, its principal amount does not change over time. To calculate Simple Interest, we use the following formula− Simple Interest (S.I) = Principal * Time * Rate / 100 where, P is the principal amount T is the time R is the rate ...
Read MoreJava Program to Display All Prime Numbers from 1 to N
In this article, we will understand how to display all the prime numbers from 1 to N in Java. All possible positive numbers from 1 to infinity are called natural numbers. A number is a prime number if its only factors are 1 and itself and cannot be divided by any other number. 11 is a prime number. Its factors are 1 and 11 itself. Some examples of prime numbers are 2, 3, 5, 7, 11, 13, and so on. 2 is the only even prime number. All other prime numbers are odd numbers. Below is a demonstration of the ...
Read MoreHow to find length of a string without string.h and loop in C?
C provides libraries for string operations such as the string.h header file that contains a strlen() function, which counts the length of a string. Otherwise, a loop can be used to count the string length. There are also different ways to find the length of a string apart from the above two methods. So, basically, in this article, we will learn how to find the length of a string without string.h and loop in C. Find Length of a String Without string.h and Loop in C There are the following ways to find the string's length without using the string.h ...
Read MoreInsertion and Deletion in STL Set C++
The STL set is a container that stores unique elements in a sorted order. Insertions and deletions are common operations performed in containers like std::set and std::vector. In this article, we will learn how to insert and delete elements in a C++ STL set. Insertion in STL Set To insert a new element into a std::set you can use the insert method or the emplace method. Let's understand how to use these methods with examples. Using insert Method Using emplace Method 1. Using insert Method The insert ...
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