Java Virtual Machine Learning notes Chapter II walk into Java

1. Why Java is gaining recognition
   1. Structured, object-oriented
   2. Write once and run everywhere
   3. Relatively secure memory management and access mechanisms to avoid most memory leaks and pointer out-of-bounds
   4. Run-time compilation is optimized

2. JDK is the smallest environment to support Java program development
3. Schedule

1991 Oak

1995 Oak Changed to Java

1996 4 Java One

1997 Sun JDK 1.1 JDBC Jar Javabeas RMI Inner reflection

2002 February jdk1.4 Regular expression exception even NIO log-class XML

2004 jdk1.5 Automatic Boxing generic dynamic Annotation enumeration variable-length parameter traversal loop

2006 1.6 The end of the Java EE j2se naming method is changed to 6 Java 6 Javame 6

2006 11 13 Announces open source JDK OpenJDK actually and Sun JDK is the same set of code base development products

Hostspot VMk Sun jdk and open jdk with their own virtual machines

BEA JRockit VM

4. Prospect

A complex and important approach to modular solution system

Mixed language

Multi-core parallelism

Further enrich the grammar

64-bit virtual machine

Problems with the Java Virtual machine running on a 64-bit system: pointer expansion, data type alignment filler

Java Virtual Machine Learning notes Chapter II walk into Java