在“jdk\bin”中找不到“javac.exe”

Question

我正在尝试在运行 64 位 Windows 10 的 Surface Pro 3 上安装 JDK。

正如Core JAVA 的作者所建议的，我将 JAVA 安装在C:\Java\jdk1.8.0_72\, 以避免路径名中出现空格。我发誓我已经安装了JDK（从这里下载），而不是JRE。

但是，设置环境变量后path，我打开命令提示符，输入javac -version，它告诉我'javac' is not recognized as an internal or external command, operable program or batch file.。所以我查了一下C:\Java\jdk1.8.0_72\bin\，并没有调用的可执行文件javac.exe！

怎么会这样？而我现在该怎么办？

这是我在dir以下命令下运行时的 CMD 输出jdk\bin：

Microsoft Windows [?? 10.0.10240]
(c) 2015 Microsoft Corporation. All rights reserved.

C:\Users\sqy>cd C:\Java\jdk1.8.0_72\bin

C:\Java\jdk1.8.0_72\bin>dir
 ??? C ????????
 ?????? D611-8A7A

 C:\Java\jdk1.8.0_72\bin ???

2016/02/02  13:28    <DIR>          .
2016/02/02  13:28    <DIR>          ..
2016/02/02  13:28         1,182,304 awt.dll
2016/02/02  13:28            15,456 bci.dll
2016/02/02  13:28    <DIR>          client
2016/02/02  13:28           142,944 dcpr.dll
2016/02/02  13:28            63,584 decora_sse.dll
2016/02/02  13:28           451,168 deploy.dll
2016/02/02  13:28    <DIR>          dtplugin
2016/02/02  13:28            25,184 dt_shmem.dll
2016/02/02  13:28            21,600 dt_socket.dll
2016/02/02  13:28           109,152 eula.dll
2016/02/02  13:28           222,816 fontmanager.dll
2016/02/02  13:28           151,136 fxplugins.dll
2016/02/02  13:28           200,800 glass.dll
2016/02/02  13:28           400,992 glib-lite.dll
2016/02/02  13:28           514,656 gstreamer-lite.dll
2016/02/02  13:28           131,680 hprof.dll
2016/02/02  13:28           115,808 instrument.dll
2016/02/02  13:28            16,480 j2pcsc.dll
2016/02/02  13:28            51,296 j2pkcs11.dll
2016/02/02  13:28            19,552 jaas_nt.dll
2016/02/02  13:28            30,816 jabswitch.exe
2016/02/02  13:28            15,968 java-rmi.exe
2016/02/02  13:28           126,560 java.dll
2016/02/02  13:28           191,072 java.exe
2016/02/02  13:28           127,584 JavaAccessBridge.dll
2016/02/02  13:28           153,088 javacpl.cpl
2016/02/02  13:28            68,704 javacpl.exe
2016/02/02  13:28            57,440 javafx_font.dll
2016/02/02  13:28           444,000 javafx_font_t2k.dll
2016/02/02  13:28           126,048 javafx_iio.dll
2016/02/02  13:28           191,584 javaw.exe
2016/02/02  13:28           268,384 javaws.exe
2016/02/02  13:28            23,648 java_crw_demo.dll
2016/02/02  13:28            13,920 jawt.dll
2016/02/02  13:28            14,944 JAWTAccessBridge.dll
2016/02/02  13:28           163,936 jdwp.dll
2016/02/02  13:28            22,624 jfr.dll
2016/02/02  13:28           115,296 jfxmedia.dll
2016/02/02  13:28        33,926,240 jfxwebkit.dll
2016/02/02  13:28            15,968 jjs.exe
2016/02/02  13:28           158,816 jli.dll
2016/02/02  13:28           205,920 jp2iexp.dll
2016/02/02  13:28            77,920 jp2launcher.exe
2016/02/02  13:28            19,040 jp2native.dll
2016/02/02  13:28           173,152 jp2ssv.dll
2016/02/02  13:28           146,016 jpeg.dll
2016/02/02  13:28            16,480 jsdt.dll
2016/02/02  13:28            30,816 jsound.dll
2016/02/02  13:28            27,744 jsoundds.dll
2016/02/02  13:28           178,272 kcms.dll
2016/02/02  13:28            15,968 keytool.exe
2016/02/02  13:28            15,968 kinit.exe
2016/02/02  13:28            15,968 klist.exe
2016/02/02  13:28            15,968 ktab.exe
2016/02/02  13:28           185,952 lcms.dll
2016/02/02  13:28            33,376 management.dll
2016/02/02  13:28           574,560 mlib_image.dll
2016/02/02  13:28           455,328 msvcp120.dll
2016/02/02  13:28           773,968 msvcr100.dll
2016/02/02  13:28           970,912 msvcr120.dll
2016/02/02  13:28            79,968 net.dll
2016/02/02  13:28            51,296 nio.dll
2016/02/02  13:28            17,504 npt.dll
2016/02/02  13:28            16,480 orbd.exe
2016/02/02  13:28            15,968 pack200.exe
2016/02/02  13:28    <DIR>          plugin2
2016/02/02  13:28            15,968 policytool.exe
2016/02/02  13:28            52,832 prism_common.dll
2016/02/02  13:28           116,832 prism_d3d.dll
2016/02/02  13:28            86,112 prism_sw.dll
2016/02/02  13:28            14,944 resource.dll
2016/02/02  13:28            15,968 rmid.exe
2016/02/02  13:28            15,968 rmiregistry.exe
2016/02/02  13:28            15,968 servertool.exe
2016/02/02  13:28           177,248 splashscreen.dll
2016/02/02  13:28           462,432 ssv.dll
2016/02/02  13:28            51,808 ssvagent.exe
2016/02/02  13:28           124,000 sunec.dll
2016/02/02  13:28            25,696 sunmscapi.dll
2016/02/02  13:28           193,120 t2k.dll
2016/02/02  13:28            16,480 tnameserv.exe
2016/02/02  13:28            65,632 unpack.dll
2016/02/02  13:28           159,328 unpack200.exe
2016/02/02  13:28            39,520 verify.dll
2016/02/02  13:28            21,600 w2k_lsa_auth.dll
2016/02/02  13:28            95,840 WindowsAccessBridge.dll
2016/02/02  13:28           164,448 wsdetect.dll
2016/02/02  13:28            69,728 zip.dll
              85 ???     46,209,264 ??
               5 ??? 150,936,281,088 ????

C:\Java\jdk1.8.0_72\bin>

是的，我是中国人，所以输出中有一些汉字。我已将默认语言更改为英语，它们仍然存在。但是，我想您仍然可以获得所需的信息。

Answer 1

它位于您的 .bin 目录下C:\Java\jdk1.8.0_72。现在您需要更新环境变量并附加到C:\Java\jdk1.8.0_72\bin分号后的路径变量。重要提示：不要删除现有的 Path 变量，只需追加C:\Java\jdk1.8.0_72

现在重新打开命令提示符并输入 javac。

编辑：当安装程序询问您想要将 JRE 安装在哪里时，您可能会指向您告诉安装程序放置 JDK 的同一目录吗？在这种情况下，安装程序将用 JRE 的 bin 内容覆盖 JDK 的 bin 内容。