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1 Create a control of the required type using the New keyword: the type name of each control is the name that you see when you hover the mouse cursor over a Toolbox control 2 Set the size of the control using the Size property You can copy the size of an existing control (eg newControlSize = existingControlSize), or can set the Width and Height properties explicitly (eg newControlWidth = 100: newControlHeight = 20) 3 Set the location of the control relative to the top, left of the container Typically this will be the top, left of the form, but if you add a control to a GroupBox or Panel control, it will be the top, left of this Set either the Top and Left properties, or create a new location object, assign top and left values to it and assign this 4 Set the required BackColor, ForeColor and Font properties A control will automatically take on the BackColor, ForeColor and Font of its container, so you only need to set those properties that you want to be different 5 Set any Text, Picture, Value or other settings speci c to the type of control 6 Call the control s Show() method to make it visible and activate it 7 Add the control to a Container control: normally this will be a form, but it can be a Panel, PictureBox or GroupBox control No matter which, the container will have a Controls collection, and the Add() method is used to add the new control 8 Optionally, you can add event-handlers to a control so that it will respond to events by executing a pre-de ned sub The sub must match the signature for the event-handler added (in most cases, it will require two parameters to indicate the sender of the event and the event arguments), and the AddHandler statement is used to match up the object s event with the pre-de ned handler This makes adding a control look quite complicated, but the code to do this is quite straightforward for all but the last step For example, the sub shown in Listing 921 will add a number of RadioButtons to a GroupBox The number and text of the options is provided by an array passed to the sub as a parameter.

package javalang; public class Object { public final Class< > getClass() { } public String toString() { } public boolean equals(Object obj) { } public int hashCode() { } protected Object clone() throws CloneNotSupportedException { }

The method toString returns a String representation of the object The methods equals and hashCode are very useful in hashtables such as javautilHashtable The method equals de nes a notion of object equality, which is based on value, not reference, comparison The method clone is used to make a duplicate of an object

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'This Sub is part of a form class 'As it is private, it must be called from within the form Private Sub CreateOptions(ByVal Options() As String) Dim item As String Dim itemTop As Integer = 10 Dim itemCount As Integer, itemSpace As Integer Dim radItem As RadioButton 'We can work out how much vertical space to give an item 'by dividing the available space by the number of items itemCount = OptionsGetLength(0) itemSpace = (grpOptionsHeight 20) / itemCount For Each item In Options 'Create the new control

The methods wait, notify, and notifyAll are used in concurrent programming using threads, as described in 17

radItem = New RadioButton() 'Set up its size radItemWidth = 150 radItemHeight = 20 'Set up its position radItemLeft = 20 radItemTop = itemTop 'Set the RadioButton's Text property radItemText = item 'Make sure only the first one is checked (we 'could leave them all unchecked instead) If itemTop = 10 Then radItemChecked = True End If 'Add the control to a container control grpOptionsControlsAdd(radItem) 'And update to the top of the next item itemTop += itemSpace Next End Sub Listing 921: Code to create a group of RadioButtons

433 The Class String Instances of class String represent sequences of Unicode characters A String object has a constant (unchanging) value String literals ( 3105) are references to instances of class String

CreateOptions sub We start by working out how many options there will be The GetLength() method of an array does this the parameter to it is the dimension

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