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You are given a String and your task is to find its beginning. Here, beginning means starting characters of the string up to a certain position. In Java, String is a class of java.lang package that represents a sequence of characters. These characters are enclosed within double quotes. If you want to access characters in a Java String, use their index. Each character is associated with a numerical index, starting from 0 up to n-1, where n is the length of String. In this article, we will learn how to use the index to find the ... Read More
For a given String , our task is to write a Java program that converts it into an Integer. In Java, String is a class in java.lang package that stores a series of characters enclosed within double quotes. Integer is a primitive datatype that stores numerical values. Converting a String to int in Java We can use the following methods to convert a string into an integer in Java: Integer.parseInt() Integer.valueOf() Let's discuss these methods one by one with the help of example programs. Using Integer.parseInt() The Integer.parseInt() is a static method that belongs to the Integer class ... Read More
In C++, operators are special symbols that are designed to perform various Operations on variables and values, like arithmetic, comparison, or logical operations. A Postfix Operator is a type of operator that is used to increment or decrement a value by 1(unless overloaded). It is a unary operator, which works only on a single variable. There are two types of postfix operators in C++: ++ : Post-increment -- : Post-decrement Post Increment Operator (++) The post-increment operator increments the value of a given variable by 1, but only after its ... Read More
We are given a String and our task is to write Java programs that count its words. A string is a class in Java that stores a series of characters enclosed within double quotes. To count words of the given strings, check whether the character at the current index is a whitespace (' ') or a letter. If it is whitespace and the next character is a letter. Then, increment the counter variable to specify we have encountered a word. Example Scenario: Input: "You are on Tutorials Point website"; Output: Number of words in the given string: 6 ... Read More
In Java, you cannot override static methods but you can overload them. Overloading a static method is allowed because the JVM determines which method to call at compile time based on the method signature, rather than the object's type. However, overriding is not allowed for static methods because an overridden method is called based on the object's type. In this article, we are going to discuss is it possible to overload and override a static method in Java. Also, we will understand static methods, method overloading and method overriding. What is a Static Method? A method defined using the static ... Read More
In Java, we cannot override a final method. Once a method is declared final, the Java compiler marks this method as non changeable. Therefore, behaviour of the final method will be the same throughout the application. Suppose you are building an payment application. There is a method that calculates transaction fees based on the amount. You must declare this method as final to make sure each subclass use the same calculation logic. What is a final Method in Java? A method declared using the final keyword, is called as final method. The final keyword is a non-access modifier and used ... Read More
C++ provides multiple ways to concatenate strings. Macro string concatenation is one of such way. In this article, we will learn how to use C++ preprocessor macros to concatenate strings and tokens. Understanding Macros in C++ In C++, macros are small pieces of code that are defined using the preprocessor directive #define. Macros are generally used to define variables, constants, functions, and other code blocks. When the code is compiled, the preprocessor replaces every occurrence of the macro with its defined value before actual compilation begins. Let's see an example of a macro definition and its usage. // ... Read More
The radix sort is a non-comparative sorting algorithm that sorts the individual digits of the given numbers in the list. It sorts the numbers digit by digit, starting from the least significant digit to the most significant digit. The radix sort assumes that all the input elements are k-digit numbers. So, if the elements do not have the same number of digits, find the maximum number of digits in an input element and prepend zeroes to the elements having less number of digits. In this article, we have an unsorted array of integers and our task is to implement the ... Read More
The protected and default access modifiers determine how a member of a class or method can be accessed. The modifiers are attached to the members at the time of declaration. Since Java follows the object-oriented programming paradigm, these access modifiers are used in encapsulation, polymorphism, and inheritance to control the behavior of class members. We will try to understand the difference between protected and default access modifiers in Java through this article. Protected Access Modifier The protected access modifier is mostly used in the case of inheritance to control the access of parent class members and corresponding child class members. ... Read More
Both JRadioButton and JCheckBox components can extend the JToggleButton class in Java, the main difference is that JRadioButton is a group of buttons in which only one button can be selected at a time, whereas JCheckBox is a group of checkboxes in which multiple items can be selected at a time. JRadioButton A JRadioButton is a component that represents an item with a state selected or unselected. Usually, a group of radio buttons is created to provide options to the user, but only one option can be selected at a time. JRadioButton will generate an ActionListener, ChangeListener, and ItemListener interfaces. Instantiating JRadioButton: JRadioButton Radio_Name = new JRadioButton(); ... Read More