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Object Oriented Programming Articles
Page 351 of 589
Java program to show inherited constructor calls parent constructor by default
In this article, we will learn about constructors in Java. Constructors initialize objects when they are created. We will also see how the parent constructor is called in inheritance. Problem StatementWe will demonstrate possible approaches to show how the inherited constructor calls the parent constructor by default.Different approaches The following are the different approaches to show how the inherited constructor calls the parent constructor by default− Demonstrating inheritance properties ...
Read MoreJava program to get the current value of the system timer in nanoseconds
In this article, we use the System.nanoTime() method in Java to get the current value of the system timer in nanoseconds. It returns the current value of the most precise available system timer, in nanoseconds. Problem StatementGiven that you need to get the current value of the system timer in nanoseconds, write a Java program that retrieves this value using the System.nanoTime() method.Input There is no specific input as the program retrieves the system's current time in nanoseconds directly.Output Current Value: 49908709882168 nanoseconds Steps to get the current value of the system timer in nanosecondsThe following are the ...
Read MoreJava program to set JTextArea to wrap by word
In this article, we will learn to set a JTextArea in Java to wrap text by word, ensuring that the words in the text fit neatly within the display area rather than breaking in the middle. We will create a simple GUI application using JTextArea and configure it to wrap text by word, so the content is more readable within the bounds of the text area. Steps to set JTextArea to wrap by word Following are the steps to set JTextArea to wrap by word − Import the required classes from javax.swing and java.awt for GUI ...
Read MoreJava program to convert HashMap to TreeMap
In this article, we will convert a HashMap to a TreeMap in Java. A HashMap is used for storing data as key-value pairs, but it doesn’t keep the keys in any particular order. A TreeMap sorts the keys in ascending order. By converting a HashMap to a TreeMap, we can ensure that the keys are stored in a sorted way. Problem StatementGiven a HashMap filled with key-value pairs, we need to convert it into a TreeMap so that the entries are sorted by the keys.Input ("1", "A"), ("2", "B"), ("3", "C"), ("4", "D"), ("5", "E"), ("6", "F"), ("7", ...
Read MoreJava DatabaseMetaData getCatalogs() method with example
In this article, we’ll look at how to retrieve and display the list of available catalogs (databases) in a MySQL instance using Java’s JDBC (Java Database Connectivity) API. By running a Java program that connects to the MySQL server, we’ll use the DatabaseMetaData class to fetch catalog names with the getCatalogs() method, showing each catalog’s name on the console. This process demonstrates how to access and navigate metadata in MySQL using JDBC, offering insight into the structure of your database environment. Steps to retrieve database catalogs The getCatalogs() method of the DatabaseMetaData interface returns the name of the underlying database ...
Read MoreJava program to disable the first item on a JComboBox
In this article, we will learn to disable the first item on a JComboBox using Java. This setup is useful for applications where you want to show a placeholder as the first item and prevent it from being chosen, so users must select a valid option. We will be using JComboBox. JComboBox class The JComboBox class in Java is a useful component that combines a dropdown list with a button or a text field. This lets users pick an option from the list or type their input if editing is allowed. It’s great for creating forms where users can choose ...
Read MoreJava program to deselect a range of columns in a JTable
In this article, we will learn how to deselect a range of columns in a JTable using Java. JTable is a part of the Swing framework in Java, which is used to display and edit tables. Sometimes, we may want to deselect a specific range of columns after selecting columns in a table. This can be done by using the removeColumnSelectionInterval() method. Problem Statement Given a JTable with columns selected, write a Java program to deselect a range of columns from the table. Input A JTable with columns selected.Output The specified range of columns will be deselected. Steps to ...
Read MoreDifference between Java and JavaScript.
As we know, both Java and JavaScript are programming languages and are used in application development. But there are significant differences between the languages, which we will discuss below. Java Java is a high-level language that is also a platform-independent language. It is mainly used in the development of web applications, mobile applications, games, etc. Java is a statically typed language, which means that the code must be checked for errors before it runs. JavaScript whereas JavaScript is a dynamically typed language, which means that the code is checked for errors while it runs. JavaScript is a client-server-side language, which ...
Read MoreJava program to count the child of root node in a JTree
In this article, we will go over a Java program that counts the number of child nodes of the root node in a JTree using Java. This program uses the getChildCount() method to retrieve and display the count of direct child nodes under the root. This is helpful for applications involving hierarchical structures, like directories or organizational charts. Steps to count the child of the root node in a JTree Following are the steps to count the child of the root node in a JTree −Import the necessary classes JFrame, JTree, and DefaultMutableTreeNode from java.swing package.Create a main class named SwingDemo.Define the ...
Read MoreJava program to find the surface area and volume of cuboid
In this article, we will learn how to compute a cuboid's surface area and volume using Java. A cuboid is a three-dimensional object with six faces in a rectangle shape, which means it has sides of different lengths and breadth. The difference between a cube and a cuboid is that a cube has equal length, height, and breadth, whereas these three are not the same in cuboids. Problem Statement Write a program in Java to find a cuboid's surface area and volume. Below is a demonstration of the same − Input Length= 6; Width= 7; Height= 8; Output Volume Of the Cuboid is ...
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