A Java Invoicing management system source Reading

Read Java's source program, do not know where to read the Java API

The latest JDK document, the Java API, can be found in the Java Web site http://www.oracle.com/technetwork/java/javase/documentation/index.html

One.

The main class mainframe inherits from JFrame, which is a form

Two.

Next, declare the member variable:

jlable: displaying text and pictures

jpannel: The panel can assemble some components to lay out. Of course, the panel is also a container ~

MenuBar:

The MenuBar class encapsulates the platform ' s concept of a menu bar bound to a frame. In order to associate the menu bar with a Frame object, call the frame ' s setMenuBar method.

This is a menu bar might:

JToolBar:

A is JToolBar a container this groups several components-usually buttons with Icons-into a row or column. Often, tool bars provide easy access to functionality that's also in menus

For more information, see: https://docs.oracle.com/javase/tutorial/uiswing/components/toolbar.html

Jseparator

JSeparator provides a general purpose component for implementing divider Lines-most commonly used as A divider between menu items breaks them up to logical groupings. Instead of using JSeparator directly, you can use the JMenu or JPopupMenu addSeparator method to create and add a separator. JSeparator s may also was used elsewhere in a GUI wherever a visual divider is useful

At this point, the member variable is complete

Three. Methods

3.1 Program Main method

splash screen +login

3.2 Initializing member variables toolbar

ToolBar = new ToolBar (Getframemenubar ());

Toolbar.setcursor (new Cursor (cursor.hand_cursor)); The parameter of the cursor's constructor is the type of curser

3.3 Initializing member variables Framemenubar

Here's how:

Protected MenuBar Getframemenubar () {
if (Framemenubar = = null) {
Framemenubar = new MenuBar (Getdesktoppane (), Getstatelabel ()); The return value of the initialization method for other variables
}
return framemenubar;
}

3.4 Initializing Statepanel

First new a lot of gridbagconstraints, initialize the member variable of each constraints.

Initialize Statepanel

...............

Four.

Finally, the method of initialize is called in the constructor method of the main class. This initiallize method gives this form,

Set the size

The menu bar is bound

The content panel is bound

(The initialization method of the call content panel returns a Jpane class:

Set Panel layout

And then

Placing the controls after each initialization

）

Run out

Come here today and have a meeting in the afternoon. Tomorrow continues, today only the main class

A Java Invoicing management system source Reading