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Java Articles
Page 136 of 450
Java Program to Iterate over ArrayList using Lambda Expression
The ArrayList class is a resizable array that can be found in java.util package. The difference between a built-in array and an ArrayList in Java is that the size of an array cannot be modified. Lambda Expression is a feature that was introduced in Java 8. It is useful when we use collections, such as ArrayList, Set, or Map, and we want to perform operations on the elements of these collections. In this article, we will learn how to iterate over an ArrayList using a lambda expression in Java. Iterating Over an ArrayList Using Lambda Expressions There are two main ...
Read MoreHow To Find the Length of Hypotenuse in Java?
Hypotenuse refers to the longest side, which is opposite to the right angle of a right-angled triangle. Following is the diagram of the Hypotenuse: Length of the Hypotenuse The length of the hypotenuse can be calculated using the Pythagorean theorem. According to it, the sum of the squares of the lengths of two sides is equal to the square of the length of the third side as follows: a2 + b2 = c2 c = √(a2 + b2) Where a, b, and c refer to the three sides of the right-angled triangle. You can write the above formula ...
Read MoreHow to load a file into the JShell session in Java 9?
In this article, we will learn to load a file into the JShell session in Java 9. We will learn about Jshell and different ways we can load a file in Jshell, which is the command line and the /open command. What is a JShell? JShell is a new command-line interactive REPL (Read-Evaluate-Print-Loop) tool introduced in Java 9 to evaluate declarations, statements, and expressions written in Java. This tool also allows us to execute Java code snippets and get immediate results. Loading a file into the JShell There are two ways to load a file into the JShell session in ...
Read MoreHow to implement a lambda expression in JShell in Java 9?
In this article, we will learn to implement a lambda expression in JShell in Java 9. We will learn the syntax, explain the working of lambda expressions, and how they work with functional interfaces, and give examples with the JShell environment. JShell JShell is Java's first REPL and command-line tool that provides interactive use of Java programming language elements. We can test the functionality in isolation of a class by using this tool. JShell creates a simple and easy programming environment in the command-line that takes input from the user, reads it, and prints the result. What is a ...
Read MoreWhat are new methods added to the String class in Java 9?
In this article, we will learn about the new methods added to the String class in Java 9. We will learn about Strings and the new methods in the String class, along with examples. Strings A String is the type of object that contains a collection of characters enclosed by double quotes (" "). The Java platform provides the String class to create and manipulate strings in Java. The String class is immutable, so that once it is created, a String object cannot be changed. String is the only class where operator overloading is supported in Java, we can concatenate ...
Read MoreWhat will happen when we try to override final method of the superclass in Java?
Any method that is declared as final in the superclass cannot be overridden by a subclass. If we try to override the final method of the super class, we will get a compile-time error. Rules for Implementing Method Overriding The method declaration should be the same as that of the method that is to be overridden. The class (subclass) should extend another class (superclass), prior to even try overriding. The Sub Class can never override final methods of the Super Class. Final method A method is declared final when ...
Read MoreHow can we create an unmodifiable Map in Java 9?
In this article, we will learn to create an unmodifiable Map in Java 9. First, we will learn about Map and Unmodifiable Map and after that we will be knowing the different ways through which we can create an unmodifiable map (Map.of method and unmodifiableMap() Method). Map In Java, a Map is an interface in the Collections framework used to store data in the form of key-value pairs. Each key in the map is unique and maps to some value. Some of the implementations of the Map interface are: HashMap ...
Read MoreDifferences between orTimeout() and completeOnTimeOut() methods in Java 9?
In this article, we will learn about the differences between the orTimeout() and the completeOnTimeout() methods in Java. Both the orTimeout() and completeOnTimeout() methods are defined in the CompletableFuture class, and these two methods were introduced in Java 9. CompletableFuture class The CompletableFuture class, introduced in Java 8, represents a Future that can have its value and status set explicitly. It also supports dependent functions and actions that are triggered upon the completion of the future. In Java 9, the CompletableFuture API received further enhancements. The following are some common methods of the CompletableFuture class: ...
Read MoreHow can we change the background and foreground color of a JTooltip in Java?
In this article, we will learn to change the background and foreground color of a JTooltip. We will be using UIManager.put(), we customize the tooltip for a JLabel by setting a white background and green text, which will improve the appearance of the default tooltip. What is a JToolTip? A JToolTip is a subclass of the JComponent class, and we can create a tooltip for any Java component by using the setToolTipText() method. It can be used to set up a tooltip for the component. The important methods of a JToolTip class are getAccessibleContext(), getComponent(), paramString(), and updateUI(). How to ...
Read MoreHow can we implement a rounded JTextField in Java?
In this article, we will learn to implement a rounded JTextField in Java. The JtextField is rectangular in shape, and to create a custom JTextField with rounded corners, we will use the RoundRectangle2D class and with the help of fillRoundRect() and drawRoundRect() methods in Java Swing. What is a JTextField? A JTextField is a subclass of the JTextComponent class, and it is one of the most important components that allows the user to an input text value in a single-line format. Below is the graphical representation of a JTextField: A JTextField class will generate an ActionListener interface when we ...
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