凌晨三点看的片www高清,亚洲欧美成人一区二区在线电影

Article Tags

Home

Technical Articles

Java

javaTutorial

java getter and setter best practices

In Java development, the rational use of getter and setter methods can improve the maintainability and readability of the code. 1. Naming should follow the JavaBean specification. Getters start with get, boolean type can be started with is, and setters start with set, which is convenient for IDE and framework recognition; 2. Avoid complex logic in the method, which is only used to obtain or set values, and business logic should be placed in constructors or special methods; 3. Decide whether to expose getters/setters according to requirements. Non-essential fields should not be exposed to the public, maintaining the encapsulation and immutability of the class; 4. After using the IDE automatically generates, you need to check whether adjustments need to be made, such as adding logic, ignoring fields or setting read-only attributes; 5.Lomb

Jul 19, 2025 am 02:51 AM

How to read a file line by line in Java?

There are three main ways to read each line of a file in Java, and choose on demand: 1. Use BufferedReader to read line by line, which is suitable for most scenarios, has good performance and saves resources; 2. Use the Scanner class to read, which has a more intuitive syntax and is suitable for small projects or script-like tasks; 3. When processing encoded files, use the InputStreamReader BufferedReader combination, and it is recommended to use the StandardCharsets class to avoid spelling errors. These three methods are applicable to different needs. BufferedReader is more efficient and Scanner is more concise. When handling special encodings, you need to dynamically specify the character set to avoid hard coding.

Jul 19, 2025 am 02:42 AM

Advanced Java Testing Frameworks and Libraries

Mastering advanced Java testing framework can improve testing capabilities and coverage. The following tools are recommended: 1. JUnitJupiter (JUnit5) supports Lambda, dynamic testing and extended models, suitable for modern Java projects. It is recommended to use @ExtendWith, @DisplayName and @Nested to optimize the test structure; 2. Mockito is used to simulate dependencies, and combine @Mock and @InjectMocks to achieve lightweight unit tests to improve testing efficiency; 3. TestContainers run real dependencies through Docker containers, suitable for database, message middleware and other integration tests, and can be optimized with SpringBoot annotations.

Jul 19, 2025 am 02:42 AM

php java

how to parse json in java using jackson

To parse JSON data, it is recommended to use the popular Jackson library in Java, whose core tool is the ObjectMapper class. 1. Introduce Jackson dependencies, the Maven project can be implemented by adding jackson-databind; 2. When parsing JSON strings with ObjectMapper, parse the string into a Java object through the readValue method; 3. If the field names are inconsistent, you can specify the mapping relationship by @JsonProperty annotation; 4. It can be parsed into a map to cope with the JSON of an uncertain structure; 5. When reading a JSON file, pass the File object into the readValue method; 6. Parsing complex structures

Jul 19, 2025 am 02:32 AM

how to create an arraylist in java

To create an ArrayList in Java, you need to import the java.util.ArrayList class, declare and initialize it and use add, get, set, remove and other methods to operate elements. 1. Import class: importjava.util.ArrayList; 2. Declare initialization: ArrayListlistName=newArrayList(); 3. Add elements: Use the .add() method to add elements or insert them at a specified location; 4. Get elements: access elements through .get(index); 5. Modify elements: use .set(index, value) to update values; 6. Delete elements: support index or object deletion

Jul 19, 2025 am 02:24 AM

java

Java Security Best Practices for Container Images

When deploying Java containerized, you need to pay attention to security practices to reduce risks. Specific measures include: 1. Use minimized basic images, such as distroless or Alpine, and specify specific versions to ensure stability; 2. Prohibit running containers as root users, and create non-root users in the Dockerfile and switch identities; 3. Reduce dependencies and scan vulnerabilities regularly, and build streamlined images using multiple stages; 4. Limit container permissions and resource usage, such as setting read-only file systems, memory and CPU restrictions, and prohibiting additional permissions. These steps can effectively improve the security of Java containers.

Jul 19, 2025 am 02:12 AM

Advanced Java Logging and Monitoring Strategies

Advanced monitoring and logging policies for Java applications should include structured logs, metric monitoring, distributed tracking and reasonable logging policies. 1. Use Logback or Log4j2 to output JSON format logs with context information to avoid sensitive information. 2. Collect key metrics through Micrometer or DropwizardMetrics and integrate Prometheus Grafana visualization. 3. Introduce Zipkin, Jaeger or OpenTelemetry to implement service call chain tracking. 4. Reasonably set the log level and sampling strategy, set the normal environment to INFO, high-frequency operation to sample, and record detailed context information in case of abnormalities.

Jul 19, 2025 am 02:07 AM

How to iterate over a HashMap in Java?

The common way to traverse a HashMap in Java is to use the entrySet() method. 1. Use entrySet() to get both key and value, which is suitable for most scenarios; 2. Use keySet() to traverse only keys, which is suitable for situations where only keys or occasionally values are needed, but the performance is slightly poor; 3. Use values() to only get values, which is suitable for scenarios where statistics or operation values are counted; 4. Avoid modifying the structure during traversal, and if you need to delete it, you should use Iterator. Priority is recommended to enterSet() and choose different methods according to actual needs.

Jul 19, 2025 am 02:02 AM

Advanced Java Exception Handling for Robust Applications

Advanced skills in Java exception handling include using custom exception classes, exception wrappers, try-with-resources and reasonable selection of detected and non-tested exceptions. ① Improve semantic clarity and facilitate debugging by custom exception classes (such as inheriting RuntimeException or Exception); ② In a multi-layer architecture, exceptions should be packaged instead of "eat" and retain original information for troubleshooting; ③ Use try-with-resources to automatically close resources to prevent leakage and the code is concise; ④ Select detected or non-checked exceptions based on whether the caller needs to restore, so as to avoid excessive use of detected exceptions to increase complexity.

Jul 19, 2025 am 01:52 AM

java exception handling Robust應(yīng)用

What are pass by value and pass by reference in Java?

Javadoesnotsupportpassbyreference;itusespassbyvalue.1.Forprimitives,theactualvalueiscopied,sochangesinsideamethoddonotaffecttheoriginal.2.Forobjects,acopyofthereferenceispassed,allowingmodificationoftheobject'sinternalstate,whichaffectstheoriginalobj

Jul 19, 2025 am 01:37 AM

Java Virtual Threads and Blocking Operations

Yes, virtual threads do not waste resources when encountering blocking operations. 1. When a virtual thread performs blocking operations (such as Thread.sleep(), network or file I/O), it will automatically hang itself, and release the underlying platform threads for other tasks to use. 2. It optimizes a variety of common blocking operations, including network I/O, file I/O, Thread.sleep(), synchronization lock waiting and asynchronous result waiting. 3. When using it, you should pay attention to avoid manually pooling virtual threads, reducing context switching, and pay attention to the problem that some libraries may not be adapted to virtual threads. Therefore, virtual threads are particularly suitable for I/O-intensive tasks and can significantly improve throughput and resource utilization in high concurrency scenarios.

Jul 19, 2025 am 01:28 AM

Java Security Principles: Least Privilege and Defense-in-Depth

Minimum permissions means that users or services only have the minimum permissions required to complete tasks to limit potential risks; defense in-depth is to improve overall security through multi-layer protection measures. For example, backend tasks should only give necessary read permissions, not administrator permissions; common practices include using non-privileged accounts, avoiding permission escalation code, configuring security managers, and fine-grained permission control. Depth defense is reflected in multi-level protection mechanisms such as input verification, back-end authentication, HTTPS encryption, and log monitoring. Both can be used together, such as KubernetesRBAC implementing minimal permissions, and combining SpringSecurity and APIGateway to build defense in-depth. Easily overlooked details include not enabling the security manager, over-trust third-party libraries

Jul 19, 2025 am 12:58 AM

Java Security Token Management with Vault

Managing security tokens in Java applications can achieve efficient and secure unification through HashiCorpVault. Vault provides the ability to store securely and obtain tokens dynamically. It operates the KV engine through HTTPAPI or Java clients, and stores the tokens in and reads on demand to avoid hard-coded leakage; secondly, isolation paths such as secret/{env}/service-name should be set for different environments (development, testing, production), and access permissions should be controlled in combination with Policy; in addition, it is recommended to use the AppRole authentication mechanism to automatically log in through RoleID and SecretID to obtain temporary tokens to improve automation and security; finally, please pay attention to T

Jul 19, 2025 am 12:53 AM

java vault

Java Security Best Practices for Microservices

Java microservice security requires attention to input verification, HTTPS, dependency management and log desensitization. 1. Input verification and output encoding prevent SQL injection and XSS, use @Valid and HibernateValidator to verify parameters and escape special characters; 2. Use HTTPS and authentication mechanisms such as OAuth2 JWT, mTLS or APIGateway to control access rights; 3. Control the dependent version and regularly scan for vulnerabilities with Snyk and other tools; 4. Sensitive information in the log needs to be desensitized and structured logs and hierarchical control are used to avoid leakage.

Jul 19, 2025 am 12:33 AM

microservices java security