JDK contains JRE, and JRE contains JVM.
JDK=JRE+Java development tools (javac.exe, java.exe, javadoc.exe)
The core class library of JRE=JVM+javase
JDK contains JRE, and JRE contains JVM.
JDK=JRE+Java development tools (javac.exe, java.exe, javadoc.exe)
The core class library of JRE=JVM+javase