What are the different startup scripts in JShell in Java 9?-javaTutorial-php.cn

Java 9中JShell中的不同启动脚本是什么？

JShell is an interactive Java Shell tool that can execute code from JShell and display the output immediately. JShell is a REPL (Read-Evaluate-Print-Loop) tool that can be run from the command line prompt.

In JShell, there is an option to load a script on startup that contains some special predefined options. These options can be specified using the "--startup" flag, passing in a filename or one of DEFAULT, JAVASE, and PRINTING. We can use the "/list -start" command to view all startup code snippets to be evaluated.

DEFAULT: It loads the default behavior. This is the same as not specifying it at all.
JAVASE: Imports all Java SE packages by default.
PRINTING: Define the functions print, println and printf for printing.

In the following code snippet, we can use "DEFAULT" as the startup script.

C:\Users\User>jshell --startup DEFAULT
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro

jshell> /list -start

s1 : import java.io.*;
s2 : import java.math.*;
s3 : import java.net.*;
s4 : import java.nio.file.*;
s5 : import java.util.*;
s6 : import java.util.concurrent.*;
s7 : import java.util.function.*;
s8 : import java.util.prefs.*;
s9 : import java.util.regex.*;
s10 : import java.util.stream.*;

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In the following code snippet, we can use "JAVASE" as a startup script.

C:\Users\User>jshell --startup JAVASE
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro

jshell> /list -start

s1 : import java.applet.*;
s2 : import java.awt.*;
s3 : import java.awt.color.*;
s4 : import java.awt.datatransfer.*;
s5 : import java.awt.desktop.*;
s6 : import java.awt.dnd.*;
s7 : import java.awt.event.*;
s8 : import java.awt.font.*;
s9 : import java.awt.geom.*;
s10 : import java.awt.im.*;
s11 : import java.awt.im.spi.*;
s12 : import java.awt.image.*;
s13 : import java.awt.image.renderable.*;
s14 : import java.awt.print.*;
s15 : import java.beans.*;
s16 : import java.beans.beancontext.*;
s17 : import java.io.*;
s18 : import java.lang.*;
s19 : import java.lang.annotation.*;
s20 : import java.lang.instrument.*;
s21 : import java.lang.invoke.*;
s22 : import java.lang.management.*;
s23 : import java.lang.module.*;
s24 : import java.lang.ref.*;
s25 : import java.lang.reflect.*;
s26 : import java.math.*;
s27 : import java.net.*;
s28 : import java.net.spi.*;
s29 : import java.nio.*;
s30 : import java.nio.channels.*;
s31 : import java.nio.channels.spi.*;
s32 : import java.nio.charset.*;
s33 : import java.nio.charset.spi.*;
s34 : import java.nio.file.*;
s35 : import java.nio.file.attribute.*;
s36 : import java.nio.file.spi.*;
s37 : import java.rmi.*;
s38 : import java.rmi.activation.*;
s39 : import java.rmi.dgc.*;
s40 : import java.rmi.registry.*;
s41 : import java.rmi.server.*;
s42 : import java.security.*;
s43 : import java.security.acl.*;
s44 : import java.security.cert.*;
s45 : import java.security.interfaces.*;
s46 : import java.security.spec.*;
s47 : import java.sql.*;
s48 : import java.text.*;
s49 : import java.text.spi.*;
s50 : import java.time.*;
s51 : import java.time.chrono.*;
s52 : import java.time.format.*;
s53 : import java.time.temporal.*;
s54 : import java.time.zone.*;
s55 : import java.util.*;
s56 : import java.util.concurrent.*;
s57 : import java.util.concurrent.atomic.*;
s58 : import java.util.concurrent.locks.*;
s59 : import java.util.function.*;
s60 : import java.util.jar.*;
s61 : import java.util.logging.*;
s62 : import java.util.prefs.*;
s63 : import java.util.regex.*;
s64 : import java.util.spi.*;
s65 : import java.util.stream.*;
s66 : import java.util.zip.*;
s67 : import javax.accessibility.*;
s68 : import javax.annotation.processing.*;
s69 : import javax.crypto.*;
s70 : import javax.crypto.interfaces.*;
s71 : import javax.crypto.spec.*;
s72 : import javax.imageio.*;
s73 : import javax.imageio.event.*;
s74 : import javax.imageio.metadata.*;
s75 : import javax.imageio.plugins.bmp.*;
s76 : import javax.imageio.plugins.jpeg.*;
s77 : import javax.imageio.plugins.tiff.*;
s78 : import javax.imageio.spi.*;
s79 : import javax.imageio.stream.*;
s80 : import javax.lang.model.*;
s81 : import javax.lang.model.element.*;
s82 : import javax.lang.model.type.*;
s83 : import javax.lang.model.util.*;
s84 : import javax.management.*;
s85 : import javax.management.loading.*;
s86 : import javax.management.modelmbean.*;
s87 : import javax.management.monitor.*;
s88 : import javax.management.openmbean.*;
s89 : import javax.management.relation.*;
s90 : import javax.management.remote.*;
s91 : import javax.management.remote.rmi.*;
s92 : import javax.management.timer.*;
s93 : import javax.naming.*;
s94 : import javax.naming.directory.*;
s95 : import javax.naming.event.*;
s96 : import javax.naming.ldap.*;
s97 : import javax.naming.spi.*;
s98 : import javax.net.*;
s99 : import javax.net.ssl.*;
s100 : import javax.print.*;
s101 : import javax.print.attribute.*;
s102 : import javax.print.attribute.standard.*
s103 : import javax.print.event.*;
s104 : import javax.rmi.ssl.*;
s105 : import javax.script.*;
s106 : import javax.security.auth.*;
s107 : import javax.security.auth.callback.*;
s108 : import javax.security.auth.kerberos.*;
s109 : import javax.security.auth.login.*;
s110 : import javax.security.auth.spi.*;
s111 : import javax.security.auth.x500.*;
s112 : import javax.security.cert.*;
s113 : import javax.security.sasl.*;
s114 : import javax.sound.midi.*;
s115 : import javax.sound.midi.spi.*;
s116 : import javax.sound.sampled.*;
s117 : import javax.sound.sampled.spi.*;
s118 : import javax.sql.*;
s119 : import javax.sql.rowset.*;
s120 : import javax.sql.rowset.serial.*;
s121 : import javax.sql.rowset.spi.*;
s122 : import javax.swing.*;
s123 : import javax.swing.border.*;
s124 : import javax.swing.colorchooser.*;
s125 : import javax.swing.event.*;
s126 : import javax.swing.filechooser.*;
s127 : import javax.swing.plaf.*;
s128 : import javax.swing.plaf.basic.*;
s129 : import javax.swing.plaf.metal.*;
s130 : import javax.swing.plaf.multi.*;
s131 : import javax.swing.plaf.nimbus.*;
s132 : import javax.swing.plaf.synth.*;
s133 : import javax.swing.table.*;
s134 : import javax.swing.text.*;
s135 : import javax.swing.text.html.*;
s136 : import javax.swing.text.html.parser.*;
s137 : import javax.swing.text.rtf.*;
s138 : import javax.swing.tree.*;
s139 : import javax.swing.undo.*;
s140 : import javax.tools.*;
s141 : import javax.transaction.xa.*;
s142 : import javax.xml.*;
s143 : import javax.xml.catalog.*;
s144 : import javax.xml.crypto.*;
s145 : import javax.xml.crypto.dom.*;
s146 : import javax.xml.crypto.dsig.*;
s147 : import javax.xml.crypto.dsig.dom.*;
s148 : import javax.xml.crypto.dsig.keyinfo.*;
s149 : import javax.xml.crypto.dsig.spec.*;
s150 : import javax.xml.datatype.*;
s151 : import javax.xml.namespace.*;
s152 : import javax.xml.parsers.*;
s153 : import javax.xml.stream.*;
s154 : import javax.xml.stream.events.*;
s155 : import javax.xml.stream.util.*;
s156 : import javax.xml.transform.*;
s157 : import javax.xml.transform.dom.*;
s158 : import javax.xml.transform.sax.*;
s159 : import javax.xml.transform.stax.*;
s160 : import javax.xml.transform.stream.*;
s161 : import javax.xml.validation.*;
s162 : import javax.xml.xpath.*;
s163 : import org.ietf.jgss.*;
s164 : import org.w3c.dom.*;
s165 : import org.w3c.dom.bootstrap.*;
s166 : import org.w3c.dom.events.*;
s167 : import org.w3c.dom.ls.*;
s168 : import org.w3c.dom.ranges.*;
s169 : import org.w3c.dom.traversal.*;
s170 : import org.w3c.dom.views.*;
s171 : import org.xml.sax.*;
s172 : import org.xml.sax.ext.*;
s173 : import org.xml.sax.helpers.*;

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In the following code snippet, we can use "PRINTING" as the startup script.

C:\Users\User>jshell --startup PRINTING
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro

jshell> /list -start

s1 : void print(boolean b) { System.out.print(b); }
s2 : void print(char c) { System.out.print(c); }
s3 : void print(int i) { System.out.print(i); }
s4 : void print(long l) { System.out.print(l); }
s5 : void print(float f) { System.out.print(f); }
s6 : void print(double d) { System.out.print(d); }
s7 : void print(char s[]) { System.out.print(s); }
s8 : void print(String s) { System.out.print(s); }
s9 : void print(Object obj) { System.out.print(obj); }
s10 : void println() { System.out.println(); }
s11 : void println(boolean b) { System.out.println(b); }
s12 : void println(char c) { System.out.println(c); }
s13 : void println(int i) { System.out.println(i); }
s14 : void println(long l) { System.out.println(l); }
s15 : void println(float f) { System.out.println(f); }
s16 : void println(double d) { System.out.println(d); }
s17 : void println(char s[]) { System.out.println(s); }
s18 : void println(String s) { System.out.println(s); }
s19 : void println(Object obj) { System.out.println(obj); }
s20 : void printf(java.util.Locale l, String format, Object... args) { System.out.printf(l, format, args); }
s21 : void printf(String format, Object... args) { System.out.printf(format, args); }

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