To correctly handle JDBC transactions, you must first turn off the automatic commit mode, then perform multiple operations, and finally commit or rollback according to the results; 1. Call conn.setAutoCommit(false) to start the transaction; 2. Execute multiple SQL operations, such as INSERT and UPDATE; 3. Call conn.commit() if all operations are successful, and call conn.rollback() if an exception occurs to ensure data consistency; at the same time, try-with-resources should be used to manage resources, properly handle exceptions and close connections to avoid connection leakage; in addition, it is recommended to use connection pools and set save points to achieve partial rollback, and keep transactions as short as possible to improve performance.

ToresolvenetworkconnectivityissuesinWindows,resettheTCP/IPstackbyfirstopeningCommandPromptasAdministrator,thenrunningthecommandnetshintipreset,andfinallyrestartingyourcomputertoapplychanges;ifissuespersist,optionallyrunnetshwinsockresetandrebootagain

VerifytheWindowsISOisfromMicrosoftandrecreatethebootableUSBusingtheMediaCreationToolorRufuswithcorrectsettings;2.Ensurehardwaremeetsrequirements,testRAMandstoragehealth,anddisconnectunnecessaryperipherals;3.ConfirmBIOS/UEFIsettingsmatchtheinstallatio

Linux is suitable for old hardware, has high security and is customizable, but has weak software compatibility; Windows software is rich and easy to use, but has high resource utilization. 1. In terms of performance, Linux is lightweight and efficient, suitable for old devices; Windows has high hardware requirements. 2. In terms of software, Windows has wider compatibility, especially professional tools and games; Linux needs to use tools to run some software. 3. In terms of security, Linux permission management is stricter and updates are convenient; although Windows is protected, it is still vulnerable to attacks. 4. In terms of difficulty of use, the Linux learning curve is steep; Windows operation is intuitive. Choose according to requirements: choose Linux with performance and security, and choose Windows with compatibility and ease of use.

The volatile keyword is used to ensure that the read and write of variables occurs directly in main memory. 1. It ensures that variable modifications are immediately visible to all threads, and avoids threads reading expired values due to local cache; 2. It is suitable for scenarios such as flag bit control, double-check lock singletons, and ensures safe release of objects; 3. However, it does not guarantee the atomicity of composite operations. For example, AtomicInteger or synchronized is required for self-increase. Therefore, volatile is suitable for scenarios that require visibility but no atomicity, and cannot replace the synchronization mechanism. Its limitations must be clarified when using it.

Java's garbage collection (GC) is a mechanism that automatically manages memory, which reduces the risk of memory leakage by reclaiming unreachable objects. 1.GC judges the accessibility of the object from the root object (such as stack variables, active threads, static fields, etc.), and unreachable objects are marked as garbage. 2. Based on the mark-clearing algorithm, mark all reachable objects and clear unmarked objects. 3. Adopt a generational collection strategy: the new generation (Eden, S0, S1) frequently executes MinorGC; the elderly performs less but takes longer to perform MajorGC; Metaspace stores class metadata. 4. JVM provides a variety of GC devices: SerialGC is suitable for small applications; ParallelGC improves throughput; CMS reduces

Right-clickthedesktopandselect"Displaysettings"toopenthedisplayoptions.2.Underthe"Display"section,clickthe"Displayresolution"dropdownandchoosearesolution,preferablytherecommendedoneforbestimagequality.3.Confirmthechanges

OnWindows,downloadtheGo.msiinstallerfromtheofficialsite,runittoinstallGoandsetPATHautomatically,thenverifywithgoversioninCommandPromptorPowerShell.2.OnmacOS,eitherusetheofficial.pkginstallerfromgo.dev/dl/orinstallviaHomebrewwithbrewinstallgo,whichisr