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image = tkinterPhotoImage(file=image) selftoolbar_imagesappend(image) button = tkinterButton(toolbar, image=image, command=command) buttongrid(row=0, column=len(selftoolbar_images) -1) except tkinterTclError as err: print(err) toolbargrid(row=0, column=0, columnspan=2, sticky=tkinterNW)

class Test { public static void main(String[] args) { Point[] pa = new Point[100]; // The following line will throw a ClassCastException: ColoredPoint[] cpa = (ColoredPoint[])pa; Systemoutprintln(cpa[0]);

LDAPConnection ld = new LDAPConnection(); try { // Connect to server and authenticate ldconnect( host, port, authid, authpw ); // Start deleting from the selected point delete( branch, ld, doDelete ); } catch( LDAPException e ) { Systemoutprintln( etoString() ); }

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We begin by creating a frame in which all of the window s widgets will be contained Then we create another frame, toolbar, to contain a horizontal row of buttons that have images instead of texts, to serve as toolbar buttons We lay out each toolbar button one after the other in a grid that has one row and as many columns as there are buttons At the end we lay out the toolbar frame itself as the main window frame s rst row, making it north west sticky so that it will always cling to the top left of the window (Tk automatically puts the menu bar above all the widgets laid out in the window) The layout is illustrated in Figure 155, with the menu bar laid out by Tk shown with a white background, and our layouts shown with gray backgrounds

int color;

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When an image is added to a button it is added as a weak reference, so once the image goes out of scope it is scheduled for garbage collection We must avoid this because we want the buttons to show their images after the initializer has nished, so we create an instance variable, selftoolbar_images, simply to hold references to the images to keep them alive for the program s lifetime Out of the box, Tk can read only a few image le formats, so we have had to use gif images If any image is not found a tkinterTclError exception is raised, so we must be careful to catch this to avoid the program terminating just because of a missing image Notice that we have not made all of the actions available from the menus available as toolbar buttons this is common practice

// Done, so disconnect if ( (ld != null) && ldisConnected() ) { try { lddisconnect(); } catch ( LDAPException e ) { Systemoutprintln( etoString() ); } } Systemexit(0); }

public void setColor(int color) { thiscolor = color; }

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If the Python Imaging Library s Tk extension is installed, all of the modern image formats become supported See wwwpythonwarecom/products/pil/ for details

int[] shortvec = new int[2]; Object o = shortvec; // The following line will throw a ClassCastException: Colorable c = (Colorable)o; csetColor(0); } }

In the next block of code, we rst determine if any entries are under the one being deleted We use a search scope of LDAPConnectionSCOPE_ONE We are requesting no attributes from the search because the only data we are interested in is the DNs of the entries we nd If there are any entries, we recursively call ourselves with the DNs of those entries to check the next level If there are no entries, then we delete the entry using the standard LDAPConnectiondelete method

scrollbar = tkinterScrollbar(frame, orient=tkinterVERTICAL) selflistBox = tkinterListbox(frame, yscrollcommand=scrollbarset) selflistBoxgrid(row=1, column=0, sticky=tkinterNSEW) selflistBoxfocus_set() scrollbar["command"] = selflistBoxyview scrollbargrid(row=1, column=1, sticky=tkinterNS) selfstatusbar = tkinterLabel(frame, text="Ready", anchor=tkinterW) selfstatusbarafter(5000, selfclearStatusBar) selfstatusbargrid(row=2, column=0, columnspan=2, sticky=tkinterEW) framegrid(row=0, column=0, sticky=tkinterNSEW)

Some operators apply unary numeric promotion to a single operand, which must produce a value of a numeric type: If the operand is of compile-time type Byte, Short, Character, or Integer it is subjected to unboxing conversion The result is then promoted to a value of type int by a widening conversion ( 512) or an identity conversion

/** * Delete an entry, recursing if the entry has children * * @param dn DN of the entry to delete * @param ld active connection to server * @param doDelete true if the entries really * are to be deleted */ public static void delete( String dn, LDAPConnection ld, boolean doDelete ) { String theDN = "";

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