Article Tags
Article Tags
Android: Implement daily sequential update of string array content
This tutorial details how to obtain a string array from the strings.xml file in an Android application and display different contents in the array in order every day. By using SharedPreferences for persistence management of dates and indexes, it is ensured that the application can automatically switch to the next element of the array when it is started every day, thereby achieving dynamic and orderly content updates.
Jan 12, 2026 am 07:51 AM
Java Collection Framework: Best Practices for Grouping Data Using TreeMap and List
This article aims to solve the common UnsupportedOperationException in Java development, which usually occurs when trying to add elements to a fixed-size list created using Arrays.asList(). We will explore how Arrays.asList() works and provide two correct and more elegant solutions: manually initializing the mutable list, and leveraging the Map.computeIfAbsent() method to achieve efficient data grouping, especially when aggregating data into structures such as TreeMap.
Jan 12, 2026 am 07:15 AM
Flink Join operation has no output: understanding and solving Flink's lazy loading mechanism
This article takes an in-depth look at the common problem of no output in the join operation in Flink stream processing and its solutions. The core lies in understanding Flink's lazy loading execution model, that is, all transformation operations (such as map and join) only build execution graphs and will not actually produce results unless a terminal operation (Sink) is explicitly added to consume data. This article will use specific code examples to guide users on how to correctly configure Flink jobs to ensure that join results can be effectively output and observed.
Jan 12, 2026 am 06:42 AM
Deeply understand the pitfalls of the equals method and set operations in Java
This article takes an in-depth look at the key impact of the equals method on collection operations in Java. When the equals method of a custom class (such as Card) is not implemented correctly, it may cause collection operations such as LinkedList.remove() to behave abnormally, such as removing wrong elements or duplicate data. The article emphasizes the importance of correctly covering the equals and hashCode methods, and provides standard implementation examples and best practices. It also includes suggestions for related performance optimizations such as Random instance reuse, aiming to help developers avoid common pitfalls when dealing with custom object collections.
Jan 12, 2026 am 06:24 AM
Android tutorial to create a cross-time zone synchronized countdown timer
This article aims to solve the problem of cross-time zone countdown display synchronization in Android development. The core is how to ensure that no matter which time zone the user is in, the countdown timer is always calculated and displayed based on PST (Pacific Standard Time) to avoid the countdown time being out of sync due to device time zone changes. We'll walk through code examples to explain how to achieve this goal, and provide considerations to help developers build accurate and consistent user experiences.
Jan 12, 2026 am 05:42 AM
Integrate and control Jetpack Compose dialog in Java Fragment
This tutorial details how to elegantly integrate and display the Jetpack Compose dialog box in a traditional Java Fragment without affecting the existing layout. The core method is to use a ComposeView with a size of 0dp as the host of Compose content, and control the visibility and life cycle of the dialog box through external state management (such as MutableLiveData or MutableStateFlow) to achieve seamless interaction between Compose UI and Java code.
Jan 12, 2026 am 05:30 AM
Solve the problem of blank JFrame and EDT blocking in Java Swing multi-window interaction
In a Java Swing application, when trying to open a new JFrame through a button, if the new window appears blank and cannot be closed, it is usually due to the Event Dispatch Thread (EDT) being blocked for a long time. This article will deeply explore the dangers of while (true) loops and Thread.sleep() running on EDT, and provide solutions based on javax.swing.Timer, as well as correct JFrame life cycle management and EDT security practices to ensure smooth interaction and responsiveness of multi-window applications.
Jan 12, 2026 am 05:18 AM
Java Stream Tutorial: How to concatenate strings from List in Map
This article explains in detail how to use Java Stream to correctly extract the string list corresponding to the specified key from the Map, and complete efficient splicing through flatMap and joining to avoid type inference errors and stream nesting problems.
Jan 12, 2026 am 04:57 AM
How to create a simple REST API with Java Spring Boot? (Tutorial with Code)
SpringBootenablesrapidRESTAPIdevelopmentwithminimalsetup:configuredependenciesviaSpringInitializr,defineanentityandJPArepository,createaRESTcontrollerwithannotations,thenrunandtestendpoints—noXMLorboilerplaterequired.
Jan 12, 2026 am 04:36 AM
How to get the size of an ArrayList in Java? (Code Sample)
Use the size() method to get the size of the ArrayList. It returns the current number of elements. The time complexity is O(1). The list is not modified. An empty list returns 0, and null elements are also included in the total.
Jan 12, 2026 am 04:35 AM
How to check if a String contains a substring in Java? (Code Snippet)
UseString.contains()forsimple,case-sensitivesubstringchecks;forcase-insensitive,convertbothstringstothesamecaseoruseregionMatches();indexOf()givespositioninfo;matches()orPatternsupportsregex-basedsearching.
Jan 12, 2026 am 04:27 AM
Tutorial on correct implementation of Java one-way linked list append method
This tutorial explains in detail how to implement the correct append method for a one-way linked list in Java. The core idea is to traverse the current linked list to find its last node, and then point the next pointer of the node to the head node of the linked list to be appended, thereby achieving an effective connection between the two linked lists, rather than simply modifying the head connection.
Jan 12, 2026 am 04:03 AM
Locate coordinates of newly placed element in Java 2D array
This article explores how to obtain the coordinates of a new element efficiently and accurately after placing it in a Java two-dimensional array. By deeply understanding the reference type characteristics of Java arrays, we show how to optimize the putNumber method so that it directly returns the row and column index of the newly placed element while modifying the array, thus avoiding the possible confusion of looking for the same value and simplifying the code structure.
Jan 12, 2026 am 03:42 AM
Java concurrent programming: Correct practice of ExecutorService and Runnable
This article deeply explores common problems caused by improper inheritance of the Thread class and repeated creation of Thread instances in the run() method when using ExecutorService in Java concurrent programming, namely confusing task execution results and incorrect thread name recognition. By analyzing the error code, the article clarifies the best practice of using the Runnable interface to decouple task logic from thread management, and using Thread.currentThread().getName() to accurately obtain the name of the current execution thread to build a robust and efficient concurrent application.
Jan 12, 2026 am 03:33 AM
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