Microsoft Windows [Version 10.0.19044.2006]
(c) Microsoft Corporation. All rights reserved.

C:\Users\rlkraft\Desktop\JavaGUIs>jshell
|  Welcome to JShell -- Version 11.0.12
|  For an introduction type: /help intro

jshell> int x = 6
x ==> 6

jshell> x
x ==> 6

jshell> double y = 5
y ==> 5.0

jshell> double z = x + y
z ==> 11.0

jshell> for (int i = 0; i < 4; ++i) System.out.println(i);
0
1
2
3

jshell> import java.swing.JFrame
|  Error:
|  package java.swing does not exist
|  import java.swing.JFrame;
|         ^---------------^

jshell> import javax.swing.JFrame

jshell> JFrame jf = new JFrame()
jf ==> javax.swing.JFrame[frame0,0,0,0x0,invalid,hidden, ... tPaneCheckingEnabled=true]

jshell> jf.setVisible(true)

jshell> jf.setSize(100,100)

jshell> jf.setSize(1000,100)

jshell> jf.setVisible(false)

jshell> jf.setLocation(500, 500)

jshell> jf.setVisible(true)

jshell> jf.getLocation()
$15 ==> java.awt.Point[x=76,y=176]

jshell> jf.getLocation()
$16 ==> java.awt.Point[x=392,y=634]

jshell> jf.getLocation()
$17 ==> java.awt.Point[x=190,y=585]

jshell> jf.setLocation(0,0)

jshell> jf.getLocation()
$19 ==> java.awt.Point[x=0,y=0]

jshell> jf.setVisible(true)

jshell> jf.setVisible(true)

jshell> jf.setVisible(true)

jshell> jf.getLocation()
$23 ==> java.awt.Point[x=0,y=0]

jshell> jf.getLocation()
$24 ==> java.awt.Point[x=168,y=324]

jshell> jf.getLocation()
$25 ==> java.awt.Point[x=168,y=324]

jshell> jf.setVisible(false)

jshell> jf.setVisible(true)

jshell> jf.getLocation()
$28 ==> java.awt.Point[x=636,y=277]

jshell> jf.getSize()
$29 ==> java.awt.Dimension[width=507,height=297]

jshell> jf.setVisible(true)

jshell> import javax.swing.JButon
|  Error:
|  cannot find symbol
|    symbol:   class JButon
|  import javax.swing.JButon;
|         ^----------------^

jshell> import javax.swing.JButton

jshell> JButton jb = new JButton()
jb ==> javax.swing.JButton[,0,0,0x0,invalid,alignmentX=0 ... text=,defaultCapable=true]

jshell> jf.add(jb)
$33 ==> javax.swing.JButton[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@5bd03f44,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true]

jshell> jf.remove(jb)

jshell> jf.add(jb)
$35 ==> javax.swing.JButton[,0,0,581x295,invalid,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@5bd03f44,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true]

jshell> jf.remove(jb)

jshell> jf.repaint()

jshell> jf.add(jb)
$40 ==> javax.swing.JButton[,0,0,588x295,invalid,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@5bd03f44,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true]

jshell> jf.repaint()

jshell> jf.remove(jb)

jshell> jf.add(jb)
$43 ==> javax.swing.JButton[,0,0,588x295,invalid,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@5bd03f44,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true]

jshell> jf.repaint()

jshell> import java.awt.event.ActionEvent

jshell> import java.awt.event.ActionListener

jshell> jb.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){System.out.println("Ouch.");}});

jshell> Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.
Ouch.