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Java

How to detect proxy while connecting a url

Written by Aminur Rashid
Wednesday, 01 April 2009
When I started learning Java (infact I still am) I was stuck in assignment to open the net connection, which was outside our institute firewall. The document at Sun's website explains in depth the traditional, as well as the latest way (Use of Proxy class/Proxy Selector)to use Proxies to connect to a network. To refresh what I used, here is the code using the traditional method. Be first to comment this article Add as favourites (110) \| Quote this article on your site \| Views: 380 \| E-mail
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Ctrl-shift-F1 in Swing Applications

Written by Aminur Rashid
Thursday, 26 March 2009
To see the hierarchy of a components in a swing application, one nice way is to type `ctrl-shift-F1`. Typing ctrl-shift-F1 displays the GUI hierarchy shown below: javax.swing.JFrame[frame0,100,100,297x436,invalid,layout=java.awt.BorderLayout,title=JTree Demo,resizable,normal,defaultCloseOperation=EXIT_ON_CLOSE,rootPane=javax.swing.JRootPane[,4,23,289x409,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true] javax.swing.JRootPane[,4,23,289x409,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=] javax.swing.JPanel[null.glassPane,0,0,289x409,hidden,layout=java.awt.FlowLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777217,maximumSize=,minimumSize=,preferredSize=] javax.swing.JLayeredPane[null.layeredPane,0,0,289x409,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=0,maximumSize=,minimumSize=,preferredSize=,optimizedDrawingPossible=true] javax.swing.JPanel[null.contentPane,0,0,289x409,invalid,layout=javax.swing.JRootPane$1,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=] javax.swing.JPanel[,0,0,289x379,invalid,layout=java.awt.BorderLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=] javax.swing.JScrollPane[,0,0,289x379,invalid,layout=javax.swing.ScrollPaneLayout$UIResource,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.metal.MetalBorders$ScrollPaneBorder@13f991,flags=16777544,maximumSize=,minimumSize=java.awt.Dimension[width=200,height=300],preferredSize=,columnHeader=javax.swing.JViewport[,1,1,271x16,invalid,layout=javax.swing.ViewportLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777224,maximumSize=,minimumSize=,preferredSize=,isViewSizeSet=true,lastPaintPosition=java.awt.Point[x=0,y=0],scrollUnderway=false],horizontalScrollBar=javax.swing.JScrollPane$ScrollBar[,0,0,0x0,hidden,layout=javax.swing.plaf.metal.MetalScrollBarUI,alignmentX=0.0,alignmentY=0.0,border=,flags=4194632,maximumSize=,minimumSize=,preferredSize=,blockIncrement=10,orientation=HORIZONTAL,unitIncrement=1],horizontalScrollBarPolicy=HORIZONTAL_SCROLLBAR_AS_NEEDED,lowerLeft=,lowerRight=,rowHeader=,upperLeft=,upperRight=javax.swing.JButton[,272,1,15x16,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@32efa7,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=false,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=test,defaultCapable=true],verticalScrollBar=javax.swing.JScrollPane$ScrollBar[,272,17,15x360,layout=javax.swing.plaf.metal.MetalScrollBarUI,alignmentX=0.0,alignmentY=0.0,border=,flags=4194632,maximumSize=,minimumSize=,preferredSize=,blockIncrement=10,orientation=VERTICAL,unitIncrement=1],verticalScrollBarPolicy=VERTICAL_SCROLLBAR_ALWAYS,viewport=javax.swing.JViewport[,1,17,271x360,invalid,layout=javax.swing.ViewportLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777224,maximumSize=,minimumSize=,preferredSize=,isViewSizeSet=true,lastPaintPosition=java.awt.Point[x=0,y=0],scrollUnderway=false],viewportBorder=] javax.swing.JViewport[,1,17,271x360,invalid,layout=javax.swing.ViewportLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777224,maximumSize=,minimumSize=,preferredSize=,isViewSizeSet=true,lastPaintPosition=java.awt.Point[x=0,y=0],scrollUnderway=false] javax.swing.JTree[,0,0,271x360,alignmentX=0.0,alignmentY=0.0,border=,flags=16777576,maximumSize=,minimumSize=,preferredSize=,editable=false,invokesStopCellEditing=false,largeModel=false,rootVisible=true,rowHeight=0,scrollsOnExpand=true,showsRootHandles=false,toggleClickCount=2,visibleRowCount=20] javax.swing.CellRendererPane[,0,0,0x0,hidden] javax.swing.JScrollPane$ScrollBar[,272,17,15x360,layout=javax.swing.plaf.metal.MetalScrollBarUI,alignmentX=0.0,alignmentY=0.0,border=,flags=4194632,maximumSize=,minimumSize=,preferredSize=,blockIncrement=10,orientation=VERTICAL,unitIncrement=1] javax.swing.plaf.metal.MetalScrollButton[,0,345,15x15,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@32efa7,flags=4194600,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] javax.swing.plaf.metal.MetalScrollButton[,0,0,15x15,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@32efa7,flags=4194600,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true] javax.swing.JScrollPane$ScrollBar[,0,0,0x0,hidden,layout=javax.swing.plaf.metal.MetalScrollBarUI,alignmentX=0.0,alignmentY=0.0,border=,flags=4194632,maximumSize=,minimumSize=,preferredSize=,blockIncrement=10,orientation=HORIZONTAL,unitIncrement=1] javax.swing.plaf.metal.MetalScrollButton[,0,0,0x0,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@32efa7,flags=4194600,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true] javax.swing.plaf.metal.MetalScrollButton[,0,0,0x0,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@32efa7,flags=4194600,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] javax.swing.JViewport[,1,1,271x16,invalid,layout=javax.swing.ViewportLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777224,maximumSize=,minimumSize=,preferredSize=,isViewSizeSet=true,lastPaintPosition=java.awt.Point[x=0,y=0],scrollUnderway=false] javax.swing.JLabel[,0,0,271x16,alignmentX=0.0,alignmentY=0.0,border=,flags=8388608,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,horizontalAlignment=LEADING,horizontalTextPosition=TRAILING,iconTextGap=4,labelFor=,text=test,verticalAlignment=CENTER,verticalTextPosition=CENTER] javax.swing.JButton[,272,1,15x16,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@32efa7,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=false,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=test,defaultCapable=true] javax.swing.JPanel[,0,379,289x30,layout=java.awt.FlowLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=] javax.swing.JTextField[,5,5,279x20,layout=javax.swing.plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@e06940,flags=296,maximumSize=,minimumSize=,preferredSize=,caretColor=sun.swing.PrintColorUIResource[r=51,g=51,b=51],disabledTextColor=javax.swing.plaf.ColorUIResource[r=184,g=207,b=229],editable=true,margin=javax.swing.plaf.InsetsUIResource[top=0,left=0,bottom=0,right=0],selectedTextColor=sun.swing.PrintColorUIResource[r=51,g=51,b=51],selectionColor=javax.swing.plaf.ColorUIResource[r=184,g=207,b=229],columns=25,columnWidth=11,command=,horizontalAlignment=LEADING] Be first to comment this article Add as favourites (76) \| Quote this article on your site \| Views: 319 \| E-mail
Last Updated ( Tuesday, 07 April 2009 )

Prevent reflection to access private methods and members in java classes

Written by Aminur Rashid
Thursday, 26 March 2009
Reflection is a nice evil. It can let you access private method/fields/constructor of a class. import java.lang.reflect.Field; public class UseReflection { public static void main(String args[]) { Object prey = new Prey(); try { Field pf = prey.getClass().getDeclaredField("privateString"); pf.setAccessible(true); pf.set(prey, "Aminur test"); System.out.println(pf.get(prey)); } catch (Exception e) { System.err.println("Caught exception " + e.toString()); } } } class Prey { private String privateString = "privateValue"; } Now in case you are wondering, that makes my class vulnerable to be modified, yes you are right. But then there is a way to prevent the caller from changing the modifier/changing the accessor. The easiest thing is to use the SecurityManager. Run the programme again using the default securitymanager provided by Java java -Djava.security.manager UseReflection For more on DefaultPolicy Implementation, you may want to read the document at sun. Be first to comment this article Add as favourites (66) \| Quote this article on your site \| Views: 394 \| E-mail
Last Updated ( Thursday, 26 March 2009 )
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JFormattedText Field with Date

Written by Aminur Rashid
Wednesday, 25 March 2009
While trying JFormattedTextField, I had this requirement to show placeholder to the user to guide him providing the date input. There was also a need to pop up user with the error message, if the input is correct. (Yeah, I understand that many prefer inline error messages than the pop-ups but then requirements are requirements.) One way could be to provide a MaskFormat to the JFormattedTextField and use directly validates the date, yourself using the pattern. What I tried is used both the DateFormat and MastFormat with the JFormattedTextField. The code can be modified for individual needs but the idea is to provide an input verifier to the JFormattedTextField. Use the formatter set for JFormattedTextField to verify the inputs. Along with these, also install a mask formatter to show placeholders to user. Be first to comment this article Add as favourites (54) \| Quote this article on your site \| Views: 376 \| E-mail
Last Updated ( Tuesday, 07 April 2009 )
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