Java 2014-12-03 Li Shuning

Calculator

An interface, a function

Parameters are implemented in arrays with variable number of parameters,

Viewing the source code can also be viewed from the JRE package

Box Grid layout Manager

Box:creatverticalbox

　　　　

JScrollPane

JSplitPane

JTree

JTable

Java Event-driven model

Button.addactionlistener (/* parameter is a actionlistener*/)//interface-oriented programming

Class Cbuttonexit implements actionlistener{

public void actionperformed (ActionEvent argo) {

System.exit (0);

}

}//ctrl+1 quickly generate code

Null pointer error:

Whether to instantiate, whether there is a null pointer, there is no more than life cycle, or scope.

Anonymous inner class. Instantiate in the form of an interface

JMenuItem

JMenu

JMenuBar

First do a menubar, which put is the menu, if it is a level two menus in the restaurant put menu, if the node is put JMenuItem bar

Then use addActionListener.

You can also use class Frame1 extends JFrame implements actionlistener{}

1Class Frame1Extends JFrameImplementsactionlistener{2Publicvoid actionperformed (ActionEvent Argo) { 3 Object Objsource =  Argo.getsource ();  (JComponent) Objsource; 5 if (Com.getname (). Equals ("Regist"  6  { 7 } 8 else if (Com.getname (). Equals (" 9 10  11 12}           

Java 2014-12-03 Li Shuning