<分区>
我在 Windows 上使用 jdk-8u5-windows-i586 吗？
C:\prog\j\j-8u5-w-i586\bin> dir java*.exe
25.06.2014 14:20 15.784 java-rmi.exe
25.06.2014 14:20 176.040 java.exe
25.06.2014 14:20 68.008 javacpl.exe
25.06.2014 14:20 176.040 javaw.exe
25.06.2014 14:20 264.616 javaws.exe
回答
(我想在这里给出问题的标记)
我已经检查过了。我已经从 oracle.com/technetwork/java/javase/downloads/下载了 SDK jdk-8u5-windows-i586.exe。当我在安装过程中提供自定义文件夹 (C:\prog\java\jdk-8u5-windows-i586) 时，安装程序也会将文件复制到 C:\Program Files (x86)\Java\jdk1.8.0_05\bin(看起来奇怪)
C:\PF(x86)\J\j1.8.0_05\bin> dir java*.exe
Verzeichnis von C:\Program Files (x86)\Java\jdk1.8.0_05\bin
25.06.2014 14:18 15.752 java-rmi.exe
25.06.2014 14:18 176.008 java.exe
25.06.2014 14:18 15.752 javac.exe
25.06.2014 14:18 15.752 javadoc.exe
25.06.2014 14:18 69.000 javafxpackager.exe
25.06.2014 14:18 15.752 javah.exe
25.06.2014 14:18 15.752 javap.exe
25.06.2014 14:18 176.008 javaw.exe
25.06.2014 14:18 264.584 javaws.exe
正如@Jigar Joshi 所指出的，您安装了 JRE 并且位于错误的目录中(文件夹的名称是 jdk-8u5-windows-i586)。
所以你应该去这里安装它:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
只是为了澄清，比较我拥有的两个不同安装和每个安装中的二进制文件:
JRE 8
C:\Program Files\Java\jre8\bin目录
C:\Program Files\Java\jre8\bin\dir *.exe
30/04/2014 11:13 PM 34,216 jabswitch.exe
30/04/2014 11:13 PM 15,784 java-rmi.exe
30/04/2014 11:13 PM 190,888 java.exe
30/04/2014 11:13 PM 76,200 javacpl.exe
30/04/2014 11:13 PM 191,400 javaw.exe
30/04/2014 11:13 PM 313,256 javaws.exe
30/04/2014 11:13 PM 15,784 jjs.exe
30/04/2014 11:13 PM 68,008 jp2launcher.exe
30/04/2014 11:13 PM 16,296 keytool.exe
30/04/2014 11:13 PM 16,296 kinit.exe
30/04/2014 11:13 PM 16,296 klist.exe
30/04/2014 11:13 PM 16,296 ktab.exe
30/04/2014 11:13 PM 16,296 orbd.exe
30/04/2014 11:13 PM 16,296 pack200.exe
30/04/2014 11:13 PM 16,808 policytool.exe
30/04/2014 11:13 PM 15,784 rmid.exe
30/04/2014 11:13 PM 16,808 rmiregistry.exe
30/04/2014 11:13 PM 16,808 servertool.exe
30/04/2014 11:13 PM 64,424 ssvagent.exe
30/04/2014 11:13 PM 16,296 tnameserv.exe
30/04/2014 11:13 PM 196,008 unpack200.exe
JDK 8
C:\Program Files\Java\jdk1.8.0_05\bin目录
C:\Program Files\Java\jdk1.8.0_05\bin\dir *.exe
30/04/2014 11:11 PM 16,264 appletviewer.exe
30/04/2014 11:11 PM 16,264 extcheck.exe
30/04/2014 11:11 PM 16,264 idlj.exe
30/04/2014 11:11 PM 34,184 jabswitch.exe
30/04/2014 11:11 PM 15,752 jar.exe
30/04/2014 11:11 PM 16,264 jarsigner.exe
30/04/2014 11:11 PM 15,752 java-rmi.exe
30/04/2014 11:11 PM 190,856 java.exe
30/04/2014 11:11 PM 15,752 javac.exe
30/04/2014 11:11 PM 16,264 javadoc.exe
30/04/2014 11:11 PM 80,776 javafxpackager.exe
30/04/2014 11:11 PM 15,752 javah.exe
30/04/2014 11:11 PM 15,752 javap.exe
30/04/2014 11:11 PM 191,368 javaw.exe
30/04/2014 11:11 PM 313,224 javaws.exe
30/04/2014 11:11 PM 15,752 jcmd.exe
30/04/2014 11:11 PM 16,776 jconsole.exe
30/04/2014 11:11 PM 16,264 jdb.exe
30/04/2014 11:11 PM 15,752 jdeps.exe
30/04/2014 11:11 PM 15,752 jhat.exe
30/04/2014 11:11 PM 16,264 jinfo.exe
30/04/2014 11:11 PM 15,752 jjs.exe
30/04/2014 11:11 PM 16,264 jmap.exe
30/04/2014 11:11 PM 318,856 jmc.exe
30/04/2014 11:11 PM 15,752 jps.exe
30/04/2014 11:11 PM 16,776 jrunscript.exe
30/04/2014 11:11 PM 16,264 jsadebugd.exe
30/04/2014 11:11 PM 16,264 jstack.exe
30/04/2014 11:11 PM 15,752 jstat.exe
30/04/2014 11:11 PM 15,752 jstatd.exe
30/04/2014 11:11 PM 195,976 jvisualvm.exe
30/04/2014 11:11 PM 16,264 keytool.exe
30/04/2014 11:11 PM 16,264 kinit.exe
30/04/2014 11:11 PM 16,264 klist.exe
30/04/2014 11:11 PM 16,264 ktab.exe
30/04/2014 11:11 PM 16,776 native2ascii.exe
30/04/2014 11:11 PM 16,264 orbd.exe
30/04/2014 11:11 PM 16,264 pack200.exe
30/04/2014 11:11 PM 16,776 policytool.exe
30/04/2014 11:11 PM 15,752 rmic.exe
30/04/2014 11:11 PM 15,752 rmid.exe
30/04/2014 11:11 PM 16,776 rmiregistry.exe
30/04/2014 11:11 PM 16,264 schemagen.exe
30/04/2014 11:11 PM 16,264 serialver.exe
30/04/2014 11:11 PM 16,776 servertool.exe
30/04/2014 11:11 PM 16,264 tnameserv.exe
30/04/2014 11:11 PM 195,976 unpack200.exe
30/04/2014 11:11 PM 15,752 wsgen.exe
30/04/2014 11:11 PM 16,264 wsimport.exe
30/04/2014 11:11 PM 16,264 xjc.exe