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Object Oriented Programming Articles
Page 336 of 589
How to read a .txt file with RandomAccessFile in Java?
In general, while reading or writing data to a file, you can do so, from the start of the file. You cannot read/write from random position. The java.io.RandomAccessFile class in Java enables you to read/write data to a random-access file. This acts similar to a large array of bytes where the cursor known as file pointer works like an index. With the help of file pointer you can get the position of this pointer using the getFilePointer() method and set it using the seek() method. RandomAccessFile Class: Reading Files This class provides various methods to read and write data ...
Read MoreJava program to check if string is pangram
The given task is to write a Java program to check whether a string is a pangram or not. A string is called a pangram if and only if it contains all the letters of the English alphabet, regardless of their case. Example Scenario:Let's understand the problem with an example - Input: "The quick brown fox jumps over the lazy dog" Output: Yes, the string is a pangram Read the input String, you can find all the letters of the English alphabet in it. Therefore, it is a pangram string. How to Check if a String is a Pangram ...
Read MoreWhat are the restrictions imposed on a static method or a static block of code in java?
Static Methods and Static Blocks Static methods belong to the class and they will be loaded into memory along with the class; you can invoke them without creating an object. (using the class name as reference). Whereas a static block is a block of code with a static keyword. In general, these are used to initialize the static members. JVM executes static blocks before the main method at the time of class loading. Example The following example demonstrates the usage of static blocks and static methods in Java - public class Sample { ...
Read MoreHow many types of memory areas are allocated by JVM in java?
Java Virtual Machine is a program/software that runs Java applications. It takes Java bytecode (.class files) and converts the bytecode (line by line) into machine-understandable code, line by line so the processor can understand and execute it. JVM contains a module(components) known as a class loader. It is responsible for loading the program into memory and preparing it to run. Class Loader performs three main tasks - It Loads the class into the memory. ...
Read MoreWhat is the importance of the CardLayout class in Java?
In this article, we will learn about the importance of the CardLayout class in Java. In Swing, we usually have to manage a set of views and panels in a single container. The CardLayout class provides you with a flexible and powerful method to complete this, allowing you to switch between various components, such as cards in a deck. What is CardLayout? CardLayout is a layout manager in the Java AWT package. It is different from the other layouts, where the other layout managers attempt to display all the components within the container at once, the CardLayout displays only one ...
Read MoreHow can we disable the maximize button of a JFrame in Java?
In this article, we will learn to disable the maximize button of a JFrame in Java. When creating Swing GUIs in Java, we might occasionally want to prevent users from maximizing certain windows. Removing the maximize button will do the trick for dialog windows, tool windows, or any window where a fixed size needs to be kept. What is a JFrame? A JFrame is a class from javax. swing package and it can extend java.awt.frame class. It is a top-level window with a border and a title bar. A JFrame class has many methods that can be used to customize ...
Read MoreHow can we implement a JToggleButton in Java?
In this article, we will learn about the implementation of a JToggleButton in Java. The JToggleButton is a basic Swing component in Java that is used to represent a two-state button, i.e., selected or unselected. It is therefore the best component to use when adding on/off or mode selection functionality to Java applications. JToggleButton A JToggleButton is an extension of AbstractButton, and it can be used to represent buttons that can be toggled ON and OFF. When JToggleButton is pressed for the first time, it remains pressed and it can be released only when it is pressed for the second ...
Read MoreWhat is the use of setBounds() method in Java?
The layout managers are used to automatically decide the position and size of the added components. In the absence of a layout manager, the position and size of the components have to be set manually. The setBounds() method in Java is used in such a situation to set the position and size. To specify the position and size of the components manually, the layout manager of the frame can be null. The setBounds() Method The setBounds() is a method inherited from Java's AWT (Abstract Window Toolkit) and Swing libraries that enables manual positioning and sizing of GUI components. The setBounds() ...
Read MoreWhat is a ClassCastException and when it will be thrown in Java?
In this article, we will be learning about ClassCastException in Java. But before we jump into this, we'll understand what an exception is in Java. After that, we'll learn why and when ClassCastException occurs, look at real-world code examples that throw this exception, and finally learn how to avoid or resolve it. What is an Exception in Java? An exception in Java is an event that disrupts the normal flow of the program. Java provides a way to handle these errors gracefully using try-catch blocks. There are 2 types of exceptions: Checked Exceptions – ...
Read MoreHow to display the different font items inside a JComboBox in Java?
In this article, we will learn to display the different font items inside a JComboBox in Java. The Swing framework provides a powerful JComboBox component that allows users to select an object from a drop-down list. What is a JComboBox? A JComboBox is a subclass of the JComponent class, and it is a combination of a text field and a drop-down list from which the user can choose a value. A JComboBox can generate an ActionListener, ChangeListener, and ItemListener interfaces when the user interacts with a combo box. Syntax The following is the syntax: JComboBox Box_Name = new JComboBox(array); Problem ...
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