Java provides different method calls techniques that we can use according to the need andscenario in our program. Here, methods mean a block of code that can be reused multipletimes to perform a single operation. It saves our time and also reduces the size of code.The method call is referred to as invocation of methods. To use the functionality of amethod, it must be invoked by some means. This article aims to explain how methods arecalled in Java User-defined Method in Java Before discussing the method call, let’s familiarize ourselves with syntax of the userdefined methods Syntax accessSpecifier nonAccessModifier return_Type ... Read More

In Java, every interface, class, object, variable and method of a running program is stored in distinct reasons of computer memory. The heap is the part of memory area where values of variables, methods and classes are stored at runtime. Its allocation happens dynamically and can grow or shrink depending on the application's needs. On the other hand, the reference variables, names of methods and classes are stored in the stack memory area. However, if for some reason their allocation is not handled properly then, it may lead to memory errors that we are going to discuss in this article. ... Read More

The most frequent query asked by beginner programmers is that how are parameters passed in Java. Generally, the programming languages use pass by value and pass byreference for passing parameters to a method. However, Java does not support both approaches rather it uses pass by value to pass both primitive and reference type values. In this article, we are going to understand passing parameters by value through exampleprograms. Passing Parameters to a Method in Java Let’s start this discussion by understanding the storage mechanism of Java. The referencevariables, names of methods and classes are stored in stack and their values ... Read More

To encapsulate or represent a primitive datatype within an object, Java provides theconcept of Wrapper classes. All eight wrapper classes are as follows Double, Float, Long, Integer, Short, Byte, Character, and Boolean. These classes have a variety of in-builtmethods that allows us to integrate primitives into their respective instances as well asdisintegrate instances into their respective primitive datatypes. This article aims to explainthe different ways to create instances of Wrapper Classes. Creating Instances of Wrapper Classes The following approaches are available in Java to create Instances of Wrapper Classes − With the help of Constructor Although we can create an ... Read More

TreeSet is a class of Java Collection Framework that implements the SortedSet Interface.It stores elements in ascending order and does not allow duplicate values therefore, theaccess and retrieval time becomes faster. Because of this excellent feature, TreeSet isfrequently used to store large amounts of information that need to be searched quickly.We will use the Comparable Interface to sort the given TreeSet and then using in-builtmethod named ‘first()’, we try to get the least value element from that TreeSet. Java Program to get Least value element from TreeSet Before jumping into the program, let’s familiarize ourselves with a few concepts − ... Read More

TreeSet is a class of Java Collection Framework that implements the SortedSet Interface.It stores elements in ascending order and does not allow duplicate values therefore, theaccess and retrieval time becomes faster. Because of this excellent feature, TreeSet isfrequently used to store large amounts of information that need to be searched quickly.We will use the Comparable Interface to sort the given TreeSet and then using in-builtmethods, we try to get the highest and lowest value elements from that TreeSet. Java Program to get Highest and Lowest value elements from TreeSet Before jumping into the program, let’s familiarize ourselves with a few ... Read More

TreeSet is a class of Java Collection Framework that implements the SortedSet Interface. Remember that it stores elements in ascending order and does not allow duplicate values. We need to stick with this condition while adding custom class objects to the TreeSet otherwise we will encounter a ClassCastException. Here, custom class objects mean userdefined objects that are created with the help of a constructor. Program to add Custom Class Objects to the TreeSet Earlier in the previous section, we discussed that if we failed to follow the condition of TreeSet, we will get a ClassCastException. To avoid this, we need ... Read More

Suppose we are in a situation where we need to generate random integer numbers within a specific range through Java programs. For the given scenario, there are two distinct ways available in Java. We can use either the Random class or random() method. Let’s discuss them in the next section. Generate Random Integers within a Specific Range We are going to use the following class and method − Random Class We create an object of this class to return pseudorandom numbers within a given range.We will customize this object and apply our own logic to generate any random valueswithin the ... Read More

ArrayList is a class of Java Collection Framework that implements List Interface. It is a linear structure that stores and accesses each element sequentially. It allows the storage of duplicate elements however, there are a few approaches that may help to get unique values from an ArrayList. In this article, we are going to see the practical implementation of those approaches through Java example programs. Java Program to get Unique Values from ArrayList Before jumping to the solution program for the given problem, let’s discuss the following concepts of Collection Interface − HashSet It is a class of Java Collection ... Read More

Generally, the Queue follows the First in First out (FIFO) approach but a PriorityQueue follows a priority based approach while accessing elements. Each element of the queue has a priority associated with it. The elements are prioritized based on natural sorting order. However, we can provide custom orders using a comparator. The elements of PriorityQueue are not actually sorted, they are only retrieved in sorted order. This feature allows us to modify an element of PriorityQueue easily. Java Program to modify an element of a ProrityQueue Before jumping into the program, let’s familiarize ourselves with a few in-built methods of ... Read More