JShell is an interactive REPL for Java added in JDK 9. It allows developers to instantly evaluate expressions, test classes, and experiment with the Java language. Early access for jdk 9 can be obtained from: http://jdk.java.net/9/
JShell requires the Java 9 JDK, which can currently (March 2017) be downloaded as early access snapshots from jdk9.java.net. If, when you try to run the
jshell command, you get an error beginning with
Unable to locate an executable, make sure
JAVA_HOME is set correctly.
The following packages are imported automatically when JShell starts:
import java.io.* import java.math.* import java.net.* import java.nio.file.* import java.util.* import java.util.concurrent.* import java.util.function.* import java.util.prefs.* import java.util.regex.* import java.util.stream.*