Java

A collection of 76 posts

Java

Java Predicate Interface

In Java, the Predicate interface is a functional interface that represents a boolean-valued function of one argument. It is part of the java.util.function package and is used to test the values of objects and determine whether they meet certain criteria. Here is the definition of the Predicate interface:

Java

Static Methods in Java Interfaces

In Java, a static method is a method that is associated with a class rather than an instance of the class. Static methods can be called without creating an instance of the class, and they can be accessed using the class name rather than an instance of the class. In

Java

Java Exceptions in Lambda

In Java, a lambda expression is a concise way to represent a function as an object. Lambdas are used to define functional interfaces, which are interfaces with a single abstract method. Like any other code in Java, lambda expressions can throw exceptions. However, the types of exceptions that can be

Java

Java Assertions

In Java, an assertion is a statement that allows you to test your assumptions about your program at runtime. Assertions are typically used for debugging and testing purposes, and are not meant to be used in production code. Here is an example of using assertions in Java: public class Main

Java

Filehandling and the File.Class explained

File handling is the process of reading from and writing to files in a computer system. In Java, the java.io.File class is a class in the Java I/O (Input/Output) API that represents a file or directory in the file system. Here are some examples of using

Java

The Java Calendar-API

The java.util.Calendar class in Java is a legacy class that provides utility methods for working with dates and times. It is part of the Java Date-Time API, which is a new API introduced in Java 8 that replaces the legacy java.util.Date class. Here are some examples

Java

Java Date-API explained

The java.time package in Java provides a comprehensive set of classes for working with dates, times, and durations. These classes are part of the Java Date-Time API, which is a new API introduced in Java 8 that replaces the legacy java.util.Date and java.util.Calendar classes. Here

Java

Defaultmethods in Java

In Java, a default method is a method that is defined in an interface and has a default implementation. Default methods were introduced in Java 8 as a way to add new functionality to existing interfaces without breaking compatibility with existing code. Here is an example of a default method

Java

Exceptions in Lambda

In Java, exceptions can be thrown in lambda expressions just like in any other code. If a lambda expression throws an exception, it must be caught or declared in the same way as any other exception. Here is an example of a lambda expression that throws an exception: Runnable r

Java

Functional Interfaces and SAM-Types

In Java, a functional interface is an interface that has a single abstract method (also known as a SAM type, or Single Abstract Method type). Functional interfaces are used to represent function objects, or lambda expressions, which are anonymous functions that can be passed as arguments to other methods. Here

Java

split() and regular expression in Java

split() is a method of the String class that is used to split a string into an array of substrings based on a specified delimiter. The delimiter can be any character or sequence of characters. Here is an example of how to use split(): String s = "Hello,World,!"; String[] words

Java

How to use printf() and format() in Java

format() is a static method of the String class that is used to format a string with placeholders for values that will be inserted into the string. The placeholders are specified using the % character followed by a format specifier. Here is an example of how to use format(): int x

Java

Difference between Stringbuilder and Stringbuffer in Java

StringBuffer and StringBuilder are classes in Java that are similar to the String class, but they are mutable, which means that their values can be modified after they are created. They are used to build strings efficiently by appending, inserting, or deleting characters. Here is an example of how to

Java

The `String` Class in Java

The String class in Java represents a sequence of characters. A String object is immutable, which means that it cannot be modified once it is created. Here are some of the key features of the String class: * A String object is created using a string literal, which is a sequence

Java

Autoboxing and Autounboxing

Autoboxing is a feature of the Java programming language that allows you to use primitive values as if they were objects. In Java, each primitive type has a corresponding wrapper class that allows you to use primitive values as objects. For example, the int primitive type has a corresponding Integer

Java

Converting Values in Java

In Java, you can convert the value of one type to another type using type casting. Type casting is the process of converting a value from one type to another. In Java, you can use type casting to convert a value from one primitive type to another, or to convert

Java

Primitive Types in Java

In Java, there are eight primitive data types: 1. byte: a 8-bit signed integer. 2. short: a 16-bit signed integer. 3. int: a 32-bit signed integer. 4. long: a 64-bit signed integer. 5. float: a single-precision 32-bit floating-point number. 6. double: a double-precision 64-bit floating-point number. 7. char: a single

Java

The `equals()` Method in Java

In Java, the equals() method is used to determine whether two objects are equal or not. This method is defined in the Object class, which is the root of the Java class hierarchy, and is therefore inherited by all Java classes. Here is an example of how the equals() method

Java

The `toString` Method

The toString method is a method defined in the Object class that returns a string representation of an object. This method is often used to convert an object to a human-readable string for debugging or logging purposes. The toString method is defined as follows: public String toString() The default implementation

Java

The `Object` Class in Java

In Java, the Object class is the root of the class hierarchy. Every class in Java is a subclass of Object, either directly or indirectly. The Object class defines the basic methods and properties that are inherited by all objects in Java. The Object class is located in the java.

Java

Java 16 Second Preview of Text Blocks (JEP 378)

Java 16 introduced the second preview of text blocks, which is a new feature that allows you to define multi-line string literals in Java. Text blocks are a more convenient and expressive way to define multi-line strings in Java, as they allow you to specify the string content directly in

Java

Java 16 Second Preview of Switch Expressions (JEP 361)

Java 16 introduced the second preview of switch expressions, which is a new feature that allows you to use the switch statement as an expression in Java. Switch expressions are an improved version of the traditional switch statement that allows you to use the switch statement in more contexts and

Java

Java 16 Packaging Tool (Incubator, JEP 391)

Java 16 introduced an incubator module for the Packaging Tool, which is a new tool that allows you to package your Java applications as native executables for multiple platforms. The Packaging Tool is designed to make it easy to create self-contained, native executables that can be distributed and run on

Java

Java 16 Vector API (Incubator, JEP 395)

Java 16 introduced an incubator module for the Vector API, which is a new API that provides efficient and scalable support for vector operations in Java. The Vector API is designed to allow Java programs to take advantage of modern processor architectures that support SIMD (Single Instruction Multiple Data) instructions,

Java

Java 16 Foreign-Memory Access API (Incubator, JEP 394)

Java 16 introduced an incubator module for the Foreign-Memory Access API, which is a new API that allows you to access and manipulate foreign memory from Java programs. The Foreign-Memory Access API is designed to provide a safe and efficient way to work with memory that is outside the Java