The first chapter of Java Virtual machine approaching Java

Recently, we have compiled the notes of learning the JVM, which will be uploaded in succession. Java history

1991.4Dr. James Gosling launches green project to develop Oak1995.5.23Oak renamed Java. Proposed write Once,run anywhere1996.1.23 JDK 1.0published. Represents the technology: Java Virtual machine, Applet, AWT and so on. 1997.2.19 JDK 1.1published.                                                    Represents technology: JAR file format, JDBC, JavaBeans, RMI. Syntax: Inner class (Inner Class) and Reflection (Reflection), and so on. 1998.12.4 JDK 1.2 released. Sun splits the Java technology system into j2se/j2ee/J2ME. Representative technology: EJB, Java Plug-In , Java IDL, swing, and so on. Syntax: STRICFP keyword, collections collection class. 1999.4.27 hotspot Virtual Machine released, in JDK 1. 2 as an additional offer. After JDK1.3 as the default virtual machine. 2000.5.8 JDK 1. 3 release. Math operations, new timer API, JNDI. Use CORBA IIOP to implement the RMI communication protocol. 2002.2.13 JDK 1. 4 release. Regular expressions, exception chains, NIO, log classes, XML parsers, XSLT converters, and so on. 2004.9.30 JDK 1. 5 release. Auto-boxing, generics, dynamic annotations, enumerations, variable-length parameters, traversal loops (for loops). Improved the Java memory Model (JMM), provided java.util.concurrent, and contracted the contract. 2006.12.11 JDK 1.6 released. Name to: Java Se6/java ee6/Java ME6. Provides dynamic language support, provides compilation APIs, micro HTTP server APIs, and more. There are algorithmic changes to the Java Virtual machine (lock and Sync, garbage collection, class loading). 2009.2.19 JDK 1.7 released. Provides new G1 collectors, enhanced call support for non-Java languages, upgraded class loading schemas, and more.

 Java Virtual machine history

1.4.1 Sun Classic/ Exact vm1.4.2 Sun HotSpot vm1.4.3 Sun mobile-embedded vm/meta-Circular vm            (1) KVM            (2) cdc/CLDC HotSpot Implementation            (3) Squawk VM            (4) Javainjava            (5) Maxine vm1.4.4 bea JRockit/ IBM J9 vm1.4.5 Azul vm/ bea Liquid vm
    1.4.6 Apache Harmony/ Google Android Dalvik VM1.4.7 misrosoft JVM and others

 

The first chapter of Java Virtual machine approaching Java