Zero-based Java self-study tutorial
Zero-based Java self-study tutorials include basic syntax, environment construction, object-oriented programming, arrays, exception handling, input and output streams, multi-threaded programming, collection framework, network programming, graphical interface programming and database programming. For more java related tutorials, please read other articles under this topic for details. PHP Chinese website welcomes everyone to come and learn.
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Zero-based Java self-study tutorial
JAVA introductory system tutorial (5) Basic syntax (3)
How to distinguish which overloaded method is called? When an overloaded method is called, Java will determine which overloaded method should be called based on the number and type of parameters. The method with exactly matching parameters will be executed.
Aug 10, 2018 am 10:28 AM
JAVA introductory system tutorial (4) Basic syntax (2)
Logical operators Basic logical operators: logical AND - &, logical OR - |, logical OR - ^, logical NOT -! &: If false, then false |: If true, then true ^: Same as false, different as true!: If not false, then true, if not true, then false, an even number is not itself
Aug 10, 2018 am 10:21 AM
JAVA introductory system tutorial (3) Basic syntax (1)
Constant: Its value cannot be changed during the execution of the program. String constants. Contents enclosed in double quotes. Integer constants. All integer decimal constants. All decimal character constants. Contents enclosed in single quotes. Boolean constants. More unique, only true and false. Empty constant null (explained in the array part)
Aug 10, 2018 am 10:13 AM
Java language environment building tutorial
The Java language is a widely used programming language with the advantages of portability and cross-platform nature. Before starting to learn Java programming, you first need to set up a Java language environment. This article will provide you with a simple tutorial on setting up a Java language environment to help you quickly set up a development environment. 1. Install the JavaSE development toolkit. The JavaSE development toolkit is the core component of the Java development environment. Installing the JavaSE development toolkit is the first step in building a Java language environment. First, visit or
Jun 10, 2023 am 11:35 AM
Example analysis of how to use Java arrays
1. Preface Learning Overview: In the first eight days, we learned the basics of syntax, operators and expressions, loop structures, and branch structures. Today we mainly learn the definition of arrays, related attribute methods, memory maps for array storage, and common mistakes. Learning objectives: Master the two definition methods of arrays, related attributes, understand memory principles, error resolution 2. Definition of arrays 1. Overview If the grades of a classmate need to be stored, what method should be used? As we learned before, we can define multiple variables to store different grades. But if there are more than 1,000 students, then how about defining more than 1,000 variables? Of course not, this requires using our array. 2. Characteristics of static initialization of arrays: When defining an array, directly assign a value to the array, and the system determines the length of the array.
May 10, 2023 pm 05:19 PM
How to implement java array reference
Note 1. The array can be regarded as a special class, and the writing method is consistent with the constructor reference. The formal parameter list of the abstract method of the functional interface is consistent with the formal parameter list of the constructor. 2. The format is array type []::new instance//array reference//Rapply(Tt)@Testpublicvoidtest4(){Functionfunc1=length->newString[length];String[]arr1=func1.apply(5) in Function );System.out.println(Arrays.toString(arr1));System.out
Apr 17, 2023 pm 08:58 PM
Java array performance example analysis
1. Explain that there are three differences between arrays and other types of containers: efficiency, type, and the ability to save basic types. In Java, arrays are the most efficient way to store and randomly access a sequence of object references. Arrays are used less and less in project design and are not as convenient as List and set. However, arrays still have some advantages in terms of speed. The bottom layer of the collection class is implemented through arrays. 2. Performance comparison example The following uses arrays and lists to make comparisons using summation: Longtime1=System.currentTimeMillis();for(inti=0;i
May 03, 2023 pm 04:46 PM
How to use java array
The method of using Java arrays: first declare the array before use and tell the computer what the data type is; then allocate space and tell the computer to allocate several consecutive spaces; finally assign a value to the array.
Aug 18, 2020 am 11:35 AM
How to use exception handling functions for exception catching and handling in Java
How to use exception handling functions in Java to catch and handle exceptions. In Java programming, exception handling is an important technology. It allows the program to detect and handle errors that occur during running, ensuring the stability and reliability of the program. The core concepts of exception handling in Java are exceptions and exception handling functions. 1. Exceptions Exceptions refer to errors or abnormal situations that occur during program running. Exceptions in Java can be divided into two types: checked exceptions (CheckedException) and unchecked exceptions
Oct 20, 2023 pm 07:07 PM
How to use exception handling functions in Java for exception throwing and handling
How to use exception handling functions in Java for exception throwing and handling, specific code examples are required. In Java programming, exception handling is an important concept, which allows us to handle appropriately when errors are encountered during program execution. Exception handling allows us to handle errors gracefully, avoid program crashes, and provide a better user experience. In this article, we will learn how to use exception handling functions in Java for exception throwing and handling, and give specific code examples. In Java, an exception occurs when a program is running
Oct 18, 2023 pm 12:19 PM
How to use exception handling functions to catch and handle exceptions in Java
In Java, exception handling is an important programming skill that can help us effectively catch and handle errors that may occur. This article will introduce how to use exception handling functions in Java to catch and handle exceptions, and provide some specific code examples. In Java, exception handling is mainly implemented through try-catch statement blocks. The try block is used to wrap code that may throw an exception, while the catch block is used to catch and handle exceptions that occur. Here is a simple example: try{
Oct 18, 2023 am 08:55 AM
Java language input and output stream operation skills
Java language input and output stream operation skills The Java language provides developers with many convenient input and output stream classes, making file reading and writing operations very simple and efficient. In this article, we will introduce the basic knowledge of Java language input and output streams and some common operation techniques. Java Input and Output Streams: Overview Java input and output streams are a mechanism that uses some predefined classes to read and write data streams or blocks of data. They are classes under the Java.io package that can read and write various data types, such as text, binary, and pictures.
Jun 10, 2023 pm 02:42 PM
How to implement buffered input and output streams in Java
Buffering is a performance optimization for I/O. Buffered streams add memory buffers to I/O streams. BufferedInputStream class and BufferedOutputStream class The BufferedInputStream class can wrap buffers for all subclasses of InputStream to optimize performance. The flush() method in the BufferedOutputStream class is used to write the bytes of the buffer to the file and clear the cache. Constructor method of BufferedInputStream class: Constructor method introduction BufferedInputStream(FileInputStre
May 03, 2023 pm 06:40 PM
Introduction to concurrent programming technology in Java language
Java is a programming language widely used to develop various programs, and its concurrent programming technology has received widespread attention. With the popularity of multi-core processors and the development of Web applications, the importance of concurrent programming in the Java language has become increasingly prominent. This article aims to introduce concurrent programming technology in the Java language. 1. What is concurrent programming? In computer science, concurrency refers to the phenomenon that two or more independent computing processes exist in a computer system at the same time. Concurrent programming refers to programming techniques for designing and implementing concurrent systems to solve multiple tasks
Jun 10, 2023 pm 11:11 PM
How to use thread functions in Java for multi-thread programming and thread management
Multi-thread programming is a common and important programming technology. In the Java language, using thread functions for multi-thread programming and thread management is essential. This article will introduce in detail how to use thread functions in Java for multi-thread programming and thread management, and provide specific code examples. 1. Basics of multi-thread programming In Java, using thread functions for multi-thread programming requires understanding the following basic concepts: Thread: Thread is the smallest unit for executing a program. A process can have multiple threads, and each thread executes an independent
Oct 20, 2023 am 10:12 AM
How to implement multi-threaded programming using multi-threaded functions in Java
How to use multi-threaded functions in Java to implement multi-threaded programming In Java, multi-threaded programming is an important technology that can improve the concurrency and performance of the program. In this article, we will explore how to use multi-threaded functions to implement multi-threaded programming and give specific code examples. Creating multi-threaded objects In Java, we can create multi-threaded objects by inheriting the Thread class or implementing the Runnable interface. The following is sample code using the inherited Thread class: publicclas
Oct 20, 2023 am 09:39 AM
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