myeclipse安装目录打开 myeclipse.ini 文件
#utf8 (do not remove)
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.i18n.win32.win32.x86_64_3.2.0.v201103301700
-vm
D:\ProgramFiles\Java\jdk1.8.0_151\bin\javaw.exe
-configuration
d:\program\MyEclipseProfessional\configuration
-install
d:\program\MyEclipseProfessional
-vmargs
-Xmx512m
-XX:MaxPermSize=256m
-XX:ReservedCodeCacheSize=64m
-Dosgi.nls.warnings=ignore
将红色文字改成安装的java的路径，红色部分是已改过的，默认是myeclipse自带的。