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java安装

juaner posted @ Sat, 27 Aug 2011 15:15:46 +0800 in Java , 2931 readers

一、Java的环境变量配置：
(两种方法任选一种皆可)
方法一：
依次点击：“我的电脑”－(右键)“属性”－“高级”－“环境变量”，弹出Windows的“环境变量”配置卡。
在“系统变量”栏下执行三项操作：
①新建“Classpath”(如果已有，则直接编辑)，设置其值为 .;JDK所在的绝对路径值\lib 
(例如 .;D:\Program Files\Java\jdk1.5.0_04)(若值中原来有内容，用分号与之隔开),
  注意路径前的符号为.;不能漏掉
②新建“Path”(如果已有，则直接编辑),设置其值为 %Java_Home%\bin; (若值中原来有内容，用分号与之隔开)。
方法二：
依次点击：“我的电脑”－(右键)“属性”－“高级”－“环境变量”，弹出Windows的“环境变量”配置卡。
在“系统变量”栏下执行三项操作：
①新建“Java_Home”，设置其值为 JDK所在的绝对路径(例如 D:\Program Files\Java\jdk1.5.0_04)。
②新建“Classpath”(如果已有，则直接编辑)，设置其值为 .;%Java_Home%\lib (若值中原来有内容，用分号与之隔开)。
  注意路径前的符号为.;不能漏掉
③新建“Path”(如果已有，则直接编辑),值： %Java_Home%\bin; (若值中原来有内容，用分号与之隔开)。

二、用HelloWorld程序检验

//文件名:HelloWorld.java
public class HelloWorld
{
   public static void main(String args[])
   //向屏幕上写字符串"HelloWorld!"
    {
      System.out.println("HelloWorld!");
    }
}

在dos环境下编译。找到目录文件然后编译。
javac java文件名(加后缀.java)
然后运行
java java文件名(不过不要把后缀写成.java哦,是.class文件了.可以不写后缀的,)

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