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Introduction to java core technology content
The core technology of Java includes: 1. Object-oriented syntax and data types based on C++; 2. Object-centered programming, including classes, inheritance and polymorphism; 3. Collection framework for storing and operating data; 4. Using Exception handling mechanism for handling errors, etc. If you want to know more about java, you can read the articles below this topic.
What are the contents of java core technology?Java core technologies include: 1. Object-oriented syntax and data types based on C++; 2. Object-centered programming, including classes, inheritance and polymorphism; 3. Collection framework for storing and operating data; 4. Using Exception handling mechanism for handling errors; 5. I/O classes for reading and writing data; 6. Concurrency functions that support multi-thread programming; 7. Security features that provide type safety, bounds checking and permission control; 8 . Network programming API for connecting and communicating over a network.
What are the risks of java deserialization?Risks of Java Deserialization Java deserialization is a method of restoring the serialized object state into memory. It enables developers to store objects and retrieve them later in another application. However, deserialization can also lead to serious risks, such as remote code execution (RCE). Risks When deserializing a maliciously serialized object, a Java application may be exposed to the following risks: Remote Code Execution (RCE): Malicious code can be stored in the serialized object and executed through deserialization. This allows an attacker to run arbitrary code on the target system. Sensitive information disclosure: Deserialized objects may contain sensitive information such as passwords, tokens, or financial data. An attacker can access this information and use it to compromise the system
What is the principle of Java reflection mechanism?The Java reflection mechanism is implemented through the following mechanisms: The reflection API provides interfaces and classes for accessing and manipulating reflection data. The JVM maintains an internal data structure containing metadata for all loaded classes. The reflection mechanism performs introspection operations by accessing this data.
What are the alternatives to Java's reflection mechanism?Alternatives to the Java reflection mechanism include: 1. Annotation processing: Use annotations to add metadata and generate code at compile time to process the information. 2. Metaprogramming: Generate and modify code at runtime, and can dynamically create classes and obtain information. 3. Proxy: Create a new class with the same interface as an existing class, which can enhance or modify its behavior at runtime.
What are the common protocols for Java network programming?Commonly used protocols in Java network programming include: TCP/IP: used for reliable data transmission and connection management. HTTP: used for web data transmission. HTTPS: A secure version of HTTP that uses encryption to transmit data. UDP: For fast but unstable data transfer. JDBC: used to interact with relational databases.
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