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In this article, we will see a C++ program to implement the nearest neighbour algorithm: The nearest neighbour algorithm is a greedy algorithm used to find the approximate solution to the Travelling Salesman Problem (TSP) by computing the minimum cost required to visit all the nodes by traversing across the edges only once. We can implement this algorithm using different data structures like arrays, linked lists, or trees for efficient searching. How Nearest Neighbour Algorithm Works It start at a given point (eg., a city in TSP). Find the nearest unvisited ... Read More
In this article, we will learn to set the shortcut key to a JCheckBox in Java. To create a JCheckBox with a keyboard shortcut (Alt + C), we will use Java Swing. When we either click the checkbox with the mouse or press Alt+C, the checkbox toggles, and a message dialog is displayed. We can do this by using the setMnemonic('C') method to assign the shortcut key and an ActionListener to respond to the checkbox selection. What is a JCheckBox? A JCheckBox is a subclass of JToggleButton, and it can be a small box that is either checked or unchecked. When ... Read More
Method overriding works because of the run-time method binding feature in Java. So, if we force the Java compiler to do static binding for a method then we can prevent that method from being overridden in a derived class. Preventing Method Overriding in Java We can prevent method overriding in Java in 3 ways: By declaring a method as "final" in the base class By declaring a method as "static" in the base class By declaring a method as "private" in the base class Final Methods cannot be Overridden ... Read More
A Java program may contain an interface, a variable, a method, a class, and an object. When we execute the program, the operating system allocates some memory to Java Virtual Machine. Then, JVM divides allocated memory into two parts, which are the Heap and the Stack. The values of variables, methods, and classes are stored inside the Heap. And, the reference variables, method names, and classes are stored in the stack. When the Stack becomes full, the JVM throws a StackOverflowError, and when the heap becomes full, it throws an OutOfMemoryError. StackOverflowError in Java A stack is used for the execution of methods. It ... Read More
The Heap Memory and String Constant Pool are two different memory locations in Java where objects are stored during the execution of programs. Both memory areas are managed by the Java Virtual Machine. In this article, we are going to discuss the difference between Heap Memory and String Constant Pool in Java. Heap Memory Heap memory is a runtime data area from which memory for all class instances and arrays is allocated. It is the main memory area used for dynamic memory allocation in Java. Example Creating strings with the new keyword always allocates new memory in the heap. In ... Read More
Yes, we can declare a try-catch block within another try-catch block in Java, this is called nested try-catch block. The try-catch block is used to handle runtime errors that occur during the execution of a program, and the process of handling these errors is called exception handling. The runtime errors or exceptions must be handled in order to maintain the normal flow ofaJava program. Try-Catch Block in Java In a try-catch block, the code that might throw an exception should be placed or written within a try block. The catch block is used to handle the exception that is thrown from ... Read More
In Java, both the length property and the length() method are used to determine the size of data, or we can say they help us to find the number of elements an object contains. However, they are used with different Java objects. The length is an instance variable used for arrays, whereas length() is a method used with String objects. In this article, we are going to discuss the difference between length and length() in Java. The length Property An array is an object that holds a fixed number of values of the same type. Its length variable is used to find the number ... Read More
In a computer system, the binary number is expressed in the binary numeral system while the octal number is in the octal numeral system. The binary number is in base 2 while the octal number is in base 8. Examples of binary numbers and their corresponding octal numbers are as follows: Binary Number ... Read More
Tree traversal is a form of graph traversal. It involves checking or printing each node in the tree exactly once. The preorder traversal of a binary search tree involves visiting each of the nodes in the tree in the order (Root, Left, Right). An example of Preorder traversal of a binary tree is as follows. Here, we start at the root(3), then go to the left child (6), then its left(5), then right(2), then come back and move to the right subtree of 3 that is (4), then 9, and finally 8. Non-Recursive Preorder Traversal of ... Read More
Standard deviation is a measure of how spread out the numbers in a dataset are. It is the square root of the variance, where variance is the average of the squared differences from the mean. In this article, we will show you how to calculate the standard deviation in C++. Let's understand this with an example: Input: Numbers are 4, 8, 6, 5, 8 Calculating: Find the mean = (4 + 8 + 6 + 5 + 8) / 5 = 31 / 5 = 6.2 Subtract the mean and square the result: (4 - 6.2)^2 = ... Read More