Mastering Java: An Effective Project Based Approach including Web Development, Data Structures, GUI Programming and Object Oriented Programming (Beginner to Advanced) by Michael B. White

Author:Michael B. White [White, Michael B.]
Language: eng
Format: azw3, epub
Published: 2018-12-12T16:00:00+00:00

setVisible(true); // "super" Frame shows

System.out.println(this);

System.out.println(lblCount);

System.out.println(tfCount);

System.out.println(btnCount);

You can see the output, together with comments, below, giving you some idea of the variable that have been defined in the class:

// Before setVisible()

AWTCounter[frame0,0,0,250x100,invalid,hidden,layout=java.awt.FlowLayout,title=AWT Counter,resizable,normal]

// name (assigned by compiler) is "frame0"; top-left (x,y) at (0,0); width/height is 250x100 (via setSize());

java.awt.Label[label0,0,0,0x0,invalid,align=left,text=Counter]

// name is "Label0"; align is "Label.LEFT" (default); text is "Counter" (assigned in constructor)

java.awt.TextField[textfield0,0,0,0x0,invalid,text=0,selection=0-0]

// name is "Textfield0"; text is "0" (assigned in constructor)

java.awt.Button[button0,0,0,0x0,invalid,label=Count]

// name is "button0"; label text is "Count" (assigned in constructor)

// Before setVisible(), all components are invalid (top-left (x,y), width/height are invalid)

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