JVM（二）內存模型之程序計數器

原創 core_815 2020-06-29 07:46

1.是什麼？

  • 程序計數器是一塊較小的內存空間，它可以看作是當前線程所執行的字節碼的行號指示器
  • 字節碼解釋器工作時就是通過改變這個計數器的值來選取下一條需要執行的字節碼指令，分支、循環、跳轉、異常處理、線程恢復等基礎功能都需要依賴這個計數器來完成
    爲什麼？
  • 爲了線程切換後能恢復到正確的執行位置，每條線程都需要有一個獨立的程序計數器，各條線程之間的計數器互不影響，獨立存儲，我們稱這類內存區域爲“線程私有”的內存
    特點？
    內存區域中唯一一個沒有規定任何OutOfMemoryError情況的區域
    在這裏插入圖片描述
發表評論
所有評論
還沒有人評論，想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.
相關文章

Java近期新聞：Micronaut，Quarkus，JDK 18，Spring HATEOAS和JKDMon

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-12-03 14:23:56

Java近期新聞：JDK 18發版計劃、Spring Data 2021_1_0、蘋果開源GCGC

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-11-19 10:48:55

Java近期新聞：微軟加入JCP、Helidon發佈2_4_0、OpenJDK及JDK 18更新

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-11-12 13:28:50

Java近期新聞：Hibernate Reactive 1.0、Spring、OpenJDK、Cryostat 2.0

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-11-05 15:43:49

Java近期新聞：Grail 5.0、Spring、Hibernate、WildFly及Kotlin Multik開發庫更新

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-10-29 14:48:50

Java近期新聞：Spring Boot更新、Eclipse Temurin JDK 17發佈、Camel將不再支持JDK 8

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-10-04 11:28:57

Java近期新聞綜述：JDK LTS新的發佈節奏、OpenJDK、Spring更新、Helidon以及Payara平臺

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-09-29 16:18:57

爲社麼以及如何升級至Java 16或17

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Johan Janssen 2021-09-18 08:03:58

Java 近期新聞綜述：Jakarta EE 10核心Profile、OpenJDK、Open Liberty、Payara、Groovy 及Quarkus

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-09-17 12:08:57

Java近期新聞綜述：Spring 6.0和SpringBoot 3.0、OpenJDK和Quarkus更新的路線圖

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-09-08 15:08:54

Java 16 新特性介紹

{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"本文要點"}]},{

Sander Mak 2021-09-03 17:58:55

Java 近期新聞綜述：Micronaut 3.0、Open Liberty Starter、Spring Boot、GraalVM 及 JEP 400

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-08-28 11:58:53

Java近期新聞綜述：織機項目，JMC，Spring Data，Kotlin和Micronaut的最新進展

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-08-20 16:33:56

Java近期新聞綜述：MicroProfile 4.1、Spring Boot更新、Kotlin、Scala、OpenJDK、Liberica JDK

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-08-13 11:29:03

Java近期新聞綜述：IntelliJ IDEA 21.2、Quarkus 2.1、Micronaut 3.0.0-M5、WildFly、Payara Platform

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ

Michael Redlich 2021-08-06 11:23:56