java运行环境的配置

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