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Calculate the number of possible paths to JSON-driven questionnaire

This article describes how to calculate the number of all possible paths in a question-based survey using Java and JSON data. With the recursive method, we can iterate over the JSON structure and determine the total number of paths from the start problem to all possible end points. This article provides detailed code examples and explanations to help you understand and implement the algorithm so that you can better analyze and manage survey data.

Aug 24, 2025 am 11:51 AM

Calculate the number of possible paths to JSON-driven questionnaire: Java recursive method

This article describes how to use Java and recursive algorithms to calculate the number of all possible paths in a survey based on JSON configuration. We will explain in detail how to parse the JSON structure and use recursive functions to iterate through each branch of the questionnaire and finally calculate all possible completion paths. In addition, some of the advantages and limitations of this approach will be discussed and optimization suggestions are provided.

Aug 24, 2025 am 11:42 AM

Common reasons and solutions for Android Dialog not to be turned off

This article analyzes the common reasons why Dialog cannot be closed normally in Android development, and provides detailed steps and code examples to solve this problem by holding Dialog instances in Activity and placing Dialog initialization and configuration inside Dialog class to help developers avoid similar errors and ensure that Dialog is displayed and closed correctly.

Aug 24, 2025 am 11:39 AM

Solutions for GWT clients to inject values ??using Guice @Named annotation

This article aims to solve problems encountered when using Guice's @Named annotation for dependency injection in GWT client code. Due to the particularity of the GWT client environment, directly using Guice to inject static values ??will throw an error. This article will introduce how to bind static values ??to the client through AbstractGinModule, and how to obtain dynamic values ??from the server through GWT RPC, thereby avoiding the limitation of directly using Guice on the client.

Aug 24, 2025 am 11:36 AM

JSON object data extraction in Java: Avoid common pitfalls

This tutorial explains in detail how to extract specific data from JSON strings using JSON libraries such as org.json in Java. By directly parsing the JSON string into a JSONObject and using its key names for data retrieval, it can effectively avoid common parsing errors such as NullPointerException, and ensure the accuracy and efficiency of data extraction.

Aug 24, 2025 am 11:18 AM

Java merge sorting: Fix array element coverage problem and code optimization

This article aims to solve the problem of array element overwriting that occurs when Java implements merge sorting, which causes sorting to only handle a small number of elements. The article will analyze the problem code, point out the cause of the error, and provide a modified code example. In addition, code style optimization will be discussed, and it is recommended to use interfaces instead of specific classes for programming.

Aug 24, 2025 am 11:06 AM

Solve the problem of Predicate type mismatch in Java Stream

This article aims to resolve compilation errors caused by the Predicate type mismatch when using anyMatch method in Java Stream. Help developers write more robust and maintainable code by analyzing the causes of problems and providing a variety of solutions, including using maps for type conversion, leveraging Java 16's mapMulti features, and improving method design.

Aug 24, 2025 am 10:57 AM

Use Stream.collect() to correctly collect EnumSet

This article describes how to correctly provide Supplier when collecting EnumSet using the Java Stream API's collect() method. The focus is on explaining the usage of the three parameter versions in the Stream.collect() method, and how to simplify the code using the Collectors.toCollection() method to avoid type mismatch errors.

Aug 24, 2025 am 10:51 AM

How to group by in Java Streams?

GroupingBy() can easily implement grouping of elements in Java streams, and its function is similar to SQL's GROUPBY; the elements are organized into maps through classification functions, the keys are grouped values, and the values ??are element lists; counting() can be used to counting() to count the number of each group, and using mapping() to convert elements, supporting nested grouping and custom map or collection types, so as to handle data grouping requirements flexibly and efficiently.

Aug 24, 2025 am 10:40 AM

Troubleshooting and solutions for getting JSP Session attributes as NULL

This article aims to solve the problem of using session.getAttribute() in JSP to get attribute value NULL. We will dig into the scope concept in JSP, analyze the causes of this problem, and provide effective ways to share data between different browser windows using application scopes, while providing sample code and considerations to help developers better understand and solve similar problems.

Aug 24, 2025 am 10:39 AM

Deeply understand the memory management and optimization strategies of Spring singleton beans

Spring singleton beans are a single instance of the application context, and their life cycle is synchronized with the application context. Although stateless singleton beans have little impact on memory usage, stateful singleton beans may become the main cause of memory consumption if they hold a large amount of data. This article aims to explore how to effectively manage the memory of a stateful singleton bean. By introducing a cache mechanism and setting expired policies, such as using Spring's cache abstraction or directly integrating memory cache libraries such as Caffeine and Guava, it can realize on-demand loading and timely release of internal data, thereby optimizing memory usage, avoiding unnecessary memory residency, and maintaining the characteristics of a singleton bean.

Aug 24, 2025 am 10:33 AM

Android custom Dialog cannot dismiss the solution

This article aims to solve the problem that custom Dialog cannot dismiss properly in Android development. By analyzing common reasons, an effective way to manage Dialog instances as class member variables and display and close when needed. At the same time, it is recommended to place Dialog initialization and style settings inside the Dialog class to improve the maintainability and readability of the code.

Aug 24, 2025 am 10:27 AM

Efficient way to build BigInteger from byte arrays

This article aims to describe how to efficiently convert an array of bytes into a BigInteger object, especially when handling encrypted or encoded data, such as encoded one byte into four bytes. We will explore ways to avoid unnecessary binary conversions and loops, directly use byte arrays to build BigInteger, and provide sample code and precautions for flexible use in practical applications.

Aug 24, 2025 am 10:15 AM

Use Java Stream to find Map with maximum value in List

This article describes how to use the Java Stream API to find a HashMap with the largest Length value from an ArrayList. The article first suggests using custom objects instead of HashMap to improve code readability and type safety. Then, we explain in detail how to find a single largest element using Stream.max() and Collections.max(), and how to find all the collections of elements with maximum values ??using groupingBy() and collect(), and provide the corresponding sample code.

Aug 24, 2025 am 10:12 AM