What are the sensitive exceptions in java

AdeadlockinJavaoccurswhentwoormorethreadsareblockedforever,eachwaitingforaresourceheldbytheother,typicallyduetocircularwaitcausedbyinconsistentlockordering;thiscanbepreventedbybreakingoneofthefournecessaryconditions—mutualexclusion,holdandwait,nopree

UseOptional.empty(),Optional.of(),andOptional.ofNullable()tocreateOptionalinstancesdependingonwhetherthevalueisabsent,non-null,orpossiblynull.2.CheckforvaluessafelyusingisPresent()orpreferablyifPresent()toavoiddirectnullchecks.3.Providedefaultswithor

Understand JCA core components such as MessageDigest, Cipher, KeyGenerator, SecureRandom, Signature, KeyStore, etc., which implement algorithms through the provider mechanism; 2. Use strong algorithms and parameters such as SHA-256/SHA-512, AES (256-bit key, GCM mode), RSA (2048-bit or above) and SecureRandom; 3. Avoid hard-coded keys, use KeyStore to manage keys, and generate keys through securely derived passwords such as PBKDF2; 4. Disable ECB mode, adopt authentication encryption modes such as GCM, use unique random IVs for each encryption, and clear sensitive ones in time

Optional is a container class introduced by Java 8. It is used to clearly indicate that a value may be empty, thereby avoiding NullPointerException; 2. It simplifies nested null checking by providing map, orElse and other methods, preventing methods from returning null and standardizing collection return values; 3. Best practices include only returning values, avoiding the use of fields or parameters, distinguishing orElse from orElseGet, and not calling get() directly; 4. Optional should not be abused. If non-empty methods do not need to be wrapped, unnecessary Optional operations should be avoided in the stream; correct use of Optional can significantly improve code security and readability, but it requires good programming habits.

Chrome bookmark editing is simple and practical. Users can enter the bookmark manager through the shortcut keys Ctrl Shift O (Windows) or Cmd Shift O (Mac), or enter through the browser menu; 1. When editing a single bookmark, right-click to select "Edit", modify the title or URL and click "Finish" to save; 2. When organizing bookmarks in batches, you can hold Ctrl (or Cmd) to multiple-choice bookmarks in the bookmark manager, right-click to select "Move to" or "Copy to" the target folder; 3. When exporting and importing bookmarks, click the "Solve" button to select "Export Bookmark" to save as HTML file, and then restore it through the "Import Bookmark" function if necessary.

IfLeagueofLegendssettingsaren’tsaving,trythesesteps:1.Runthegameasadministrator.2.GrantfullfolderpermissionstotheLeagueofLegendsdirectory.3.Editandensuregame.cfgisn’tread-only.4.Disablecloudsyncforthegamefolder.5.RepairthegameviatheRiotClient.

First,checkforphysicalissueslikedebrisordamageandcleanthekeyboardortestwithanexternalone;2.TesttheEnterkeyindifferentappstodetermineiftheissueissoftware-specific;3.Restartyourcomputertoresolvetemporaryglitches;4.DisableStickyKeys,FilterKeys,orToggleK

IfJavaisnotrecognizedinCMD,ensureJavaisinstalled,settheJAVA_HOMEvariabletotheJDKpath,andaddtheJDK'sbinfoldertothesystemPATH.RestartCMDandrunjava-versiontoconfirm.