What are the main features of java

Java language is simple:

The syntax of Java language is very close to C language and C language, making it easy for most programmers Learn and use. On the other hand, Java discards those features of C that are rarely used, difficult to understand, and confusing, such as operator overloading, multiple inheritance, and automatic casts. In particular, the Java language does not use pointers, but references. It also provides automatic waste collection so that programmers don't have to worry about memory management.

The Java language is object-oriented:

The Java language provides object-oriented features such as classes, interfaces, and inheritance. For simplicity, it only supports single connections between classes. Inheritance, but supports multiple inheritance between interfaces, and supports the implementation mechanism between classes and interfaces (the keyword is implements). The Java language fully supports dynamic binding, while the C language only uses dynamic binding for virtual functions. In short, the Java language is a pure object-oriented programming language.

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Java language is distributed:

Java language supports Internet applications For development, there is a network application programming interface (java net) in the basic Java application programming interface, which provides class libraries for network application programming, including URL, URLConnection, Socket, ServerSocket, etc. Java's RMI (Remote Method Activation) mechanism is also an important means of developing distributed applications.

The Java language is robust:

Java’s strong typing mechanism, exception handling, automatic garbage collection, etc. are important guarantees for the robustness of Java programs. Discarding pointers is a smart choice for Java. Java's security checking mechanism makes Java more robust.

The Java language is safe:

Java is usually used in a network environment. For this reason, Java provides a security mechanism to prevent malicious code attacks. In addition to the many security features of the Java language, Java has a security prevention mechanism (class ClassLoader) for classes downloaded through the network, such as allocating different name spaces to prevent replacement of local classes of the same name, byte code inspection, and providing security management Mechanism (class SecurityManager) allows Java applications to set up security sentries.

The Java language is architecture-neutral:

Java programs (files with the suffix java) are compiled into an architecture-neutral bytecode format on the Java platform (File with the suffix class), which can then be run on any system that implements this Java platform. This approach is suitable for heterogeneous network environments and software distribution.

The Java language is portable:

This portability comes from architecture neutrality. In addition, Java also strictly stipulates the length of each basic data type. . The Java system itself is also highly portable. The Java compiler is implemented in Java, and the Java running environment is implemented in ANSI C.

Java language is interpreted:

As mentioned before, Java programs are compiled into bytecode format on the Java platform, and then this Java program can be implemented Run on any system on the platform. At runtime, the Java interpreter in the Java platform interprets and executes these bytecodes, and the classes required during the execution are loaded into the running environment during the connection phase.

Java is high-performance:

Compared with those interpreted high-level scripting languages, Java is indeed high-performance. In fact, the running speed of Java is getting closer and closer to C with the development of JIT (Just-In-Time) compiler technology.

The Java language is multi-threaded:

In the Java language, a thread is a special object, which must be composed of the Thread class or its descendants (grandchildren). to create. There are usually two ways to create a thread: first, use a constructor subclass with the type Thread(Runnable) to wrap an object that implements the Runnable interface into a thread; second, derive a subclass from the Thread class and override it run method, the object created using this subclass is a thread. It is worth noting that the Thread class has implemented the Runnable interface, so any thread has its run method, and the run method contains the code to be run by the thread. The activity of a thread is controlled by a set of methods. The Java language supports the simultaneous execution of multiple threads and provides a synchronization mechanism between multiple threads (the keyword is synchronized).

The Java language is dynamic:

One of the design goals of the Java language is to adapt to dynamically changing environments. The classes required by Java programs can be dynamically loaded into the running environment, or the required classes can be loaded through the network. This also facilitates software upgrades. In addition, classes in Java have a run-time representation and can perform run-time type checking.

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