jdk1.5 jdk1.5与jdk1.6的区别
大家好，今天我将向大家分享有关jdk1.5和jdk1.5与jdk1.6的区别的一些独特见解，希望能够为你们带来新的思考和启示。
jdk1.5环境设置
java软件包中主要有两部分：jdk，jre。前者就是开发java程序是所用的JDK，jre是java runtime envirment的简称，包括java runtime environment和java plug-in两部分。jre是用来运行、测试和传输java应用程序，它包括java虚拟机、java开发平台核心类和一些支持文件，他不包含开发工具——编译器、调试器和其他工具（存在于jdk中）。因此开发java程序不仅要jdk，还有jre。
我将我的环境变量给你作为参考：
classpath=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;
java_home=C:\Program Files\Java\jdk1.7.0;
path=%JAVA_HOME%\bin;
要说明的是classpath可以完全一样，path可以完全一样，不过最好是在原来的path前（java_home、classpath是新建的，path系统原来就有只用编辑）加上分号（英文状态）将我的path复制上去。关于java_home这是jdk的安装目录，例如我的是安装在c盘的program下的java里，
只要你找到jdk的位置，将工具栏下的地址栏内容复制到要建的java_home的值的位置就行了。
jdk1.5与jdk1.6的区别
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jdk1.5和1.4相比,主要有哪些重大的变化
开销:1.4较差的阻塞,消丰年 1.5非阻塞,减少线程的建立和消耗
稳定性、安全性:1.4稳定性、安全性相比较差1.5稳定性、安全性有更好的优势
编码效率:1.4不具有新特性 1.5新特性让语法更简洁,高效
JVM性能:1.4 1.5JDK1.5提高25-175%
生命周期:1-2年 1.5 5年
前景:无 1.5 Java 2平台标准版( J2SE) 5.0被认为是Java平台及程序设计语言自十年前发明以来最重要的里程碑。
具体的详见：J2SE 5.0 Performance White Paper
http://java.sun.com/performance/reference/whitepapers/5.0_performance.html
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