java运行环境的配置
JAVA運行環境的配置
步驟一、安裝好JDK(Java Development Kit—java開發工具)
步驟二、JDK環境變量設置
1.右擊我的電腦,選擇“內容”;
2.選擇“進階”選項卡
3.選擇“環境變數”,如圖所示
4.在系統變數下新增JAVA_HOME,如圖所示
值為JDK安裝的路徑:比如 C:\Program Files\Java\jdk1.7.0
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in 2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo
5.在Path 環境變量下新增如下值:
C:\Program Files\Java\jdk1.7.0\bin;或者 %JAVA_HOME%\bin
步驟三、測試環境變量是否成功:
1.WIN+R組合鍵彈出命令運行窗口(或“開始->運行”)
2.輸入命令CMD,回車
3.在彈出的DOS窗口中內輸入:java –version 若出現下面版本信息則
示JDK安裝配置成功
4.然後在彈出的DOS窗口內輸入:javac 若出現javac的用法信息,則
配置成功,若出現javac不是內部或外部命令 也不是可運行的程序
則配置不成功。用法信息如下圖所示:
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in 2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo
設置Path,JAVA_HOME環境變量的目的:
1.設置JAVA_HOME
(1)為了方便引用
比如你的JDK安裝在C:\Program Files\Java\jdk1.7.0目錄里,則設置JAVA_HOME為該目錄路徑,那麼以後你要使用這個路徑的時候,只需輸入%JAVA_HOME%即可,避免每次引用都輸入很長的路徑串。
(2)歸一原則
當JDK路徑被迫改變的時候,你僅需要更改JAVA_HOME的變量即可,否則,你就需要改任何用絕對路徑引用JDK目錄的文檔,要是萬一你沒有改全,某個程序找不到JDK,後果是可想而知的----系統崩潰~
(3)保證第三方軟件的正常使用
第三方軟件會引用約定好的JAVA_HOME變量,不讓,你將不能正常使用該軟件。
2.設置Path
(3)道理很簡單,你想在任何時候都使用%JAVA_HOME%\bin\java 等來執行java命令嗎,當然不會,於是,你可以選擇把%JAVA_HOME%\bin添加到Path路徑下,這樣,我們在任何路徑下就可以僅用java來執行命令了(當你在命令提示符窗口輸入這個代碼時,操作系統會在當前目錄和Path變量目錄里查找相應的應用程序,並且執行。)
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in 2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo