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Push A through J onto stk1 stk1 is full Contents of stk1: JIHGFEDCBA stk1 is empty Again push A through J onto stk1 Now, pop chars from stk1 and push them onto stk2 Contents of stk2: ABCDEFGHIJ Put 5 characters on stk3 Capacity of stk3: 10 Number of objects in stk3: 5

Well, that took a while. Placing controls on a form is not a difficult task, but it can take some time. This is another reason sketching out your interface up front is a good idea before you spend too much time in the designer window. As you might expect, the code generated in the CaptionDlg.cs source file is quite similar to what we have seen for our MainForm class in previous chapters. As a quick recap, here is a summary of the code you will find in this file. The CaptionDlg class is derived from the Form class.

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Java Code 39 Generator Introduction. Code 39 , also known as Alpha39, Code 3 of 9, Code 3/9, Type 39 , USS Code 39 , or USD-3, is the first alpha-numeric linear barcode symbology used world-wide.
Java Code 39 Generator Introduction. Code 39 , also known as Alpha39, Code 3 of 9, Code 3/9, Type 39 , USS Code 39 , or USD-3, is the first alpha-numeric linear barcode symbology used world-wide.

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Up to this point, the examples in this book have been using value types, such as int or double, as parameters to methods However, it is both correct and common to use a reference type as a parameter Doing so allows an object to be passed to a method For example, consider the following program:

public class CaptionDlg : System.Windows.Forms.Form {

// References can be passed to methods using System; class MyClass { int alpha, beta;

Each control is created as a private member of the class. The organization used by Visual Studio can be a bit confusing, so I have used the power of cut and paste to rearrange these code excerpts to be a bit more logical. If you recall, the components member is required by Visual Studio to manage certain controls on the form.

public MyClass(int i, int j) { alpha = i; beta = j; } // Return true if ob contains the same values as the invoking object public bool SameAs(MyClass ob) { if((obalpha == alpha) & (obbeta == beta)) return true; else return false; } // Make a copy of ob public void Copy(MyClass ob) { alpha = obalpha; beta = obbeta; } public void Show() { ConsoleWriteLine("alpha: {0}, beta: {1}", alpha, beta); } } class PassOb { static void Main() { MyClass ob1 = new MyClass(4, 5); MyClass ob2 = new MyClass(6, 7); ConsoleWrite("ob1: "); ob1Show(); ConsoleWrite("ob2: "); ob2Show(); if(ob1SameAs(ob2)) ConsoleWriteLine("ob1 and ob2 have the same values"); else ConsoleWriteLine("ob1 and ob2 have different values"); ConsoleWriteLine(); // Now, make ob1 a copy of ob2 ob1Copy(ob2); ConsoleWrite("ob1 after copy: "); ob1Show(); if(ob1SameAs(ob2)) ConsoleWriteLine("ob1 and ob2 have the same values"); else ConsoleWriteLine("ob1 and ob2 have different values"); } }

private System.Windows.Forms.Button btnOK; private System.Windows.Forms.Button btnCancel; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.Label lblImage; private System.Windows.Forms.TextBox txtCaption; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null;

Part I:

This program generates the following output:

The controls are initialized in the InitializeComponent method, which is called from the CaptionDlg constructor.

ob1: alpha: 4, beta: 5 ob2: alpha: 6, beta: 7 ob1 and ob2 have different values ob1 after copy: alpha: 6, beta: 7 ob1 and ob2 have the same values

/// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() {

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