www.pudn.com > ¼ÆËãÆ÷java.rar > AwtCalc.java

/** 
*File:  		AwtCalc.java 
*Version:		1.1 
*Description:   A simple calculator that uses AWT component's.   
*               
**/ 
 
import java.awt.*; 
import java.awt.event.*; 
import java.awt.Graphics; 
 
public class AwtCalc extends Panel 
{ 
    //Labels for the number panel of the calculator 
    private String[] numPanelText = { " 1 ", " 2 ", " 3 ", 
    								  " 4 ", " 5 ", " 6 ", 
    								  " 7 ", " 8 ", " 9 ", 
    								  Operator.CLEAR  , " 0 ", Operator.DOT }; 
    //Labels for the operator panel of the calculator								  				   
    private String[] operPanelText = {  Operator.ADD, Operator.SUBTRACT,  
    									Operator.MULTIPLY, Operator.DIVIDE,  
    									Operator.POW, Operator.SQRT,  
    									Operator.NEGATE, Operator.EQUALS }; 
    									 
    	 
    private Panel numButtonPanel;     //used to hold the number buttons 
    private Panel operButtonPanel;	  //used to hold the operator buttons 
    private Panel3D displayPanel;	  //used for the calculator's display  
    private ButtonHandler handler;	  //action listener for the buttons							  
    private CalcDisplay display;      //displays the output      
    private Font buttonfont;		   
     
public AwtCalc()  
{     
    //Initialize    
    buttonfont = new Font( "Courier", Font.PLAIN, 13 ); 
    setLayout( new BorderLayout() ); 
    setBackground( new Color( 212, 208, 200 ) ); 
    Panel3D mainPanel = new Panel3D( Border3D.EXCLUDE_TOP_BORDER ); 
         
        	 
    numButtonPanel = new Panel( new GridLayout(4,3, 1, 1) ); 
    operButtonPanel = new Panel( new GridLayout(4, 2, 1, 1) ); 
    displayPanel = new Panel3D( Border3D.EXCLUDE_BOTTOM_BORDER ); 
    display = new CalcDisplay( 192,26); 
    handler = new ButtonHandler( display ); 
         
    displayPanel.add( display ); 
         
    mainPanel.add( createNumberPanel() ); 
    mainPanel.add( createOperPanel() ); 
         
    add( displayPanel, BorderLayout.NORTH );      
    add( mainPanel, BorderLayout.CENTER );                      
} 
  
/* 
*  Method: 		 createNumberPanel 
*  Description:  contructs and returns the calculator's number panel 
*/ 
    
private Panel createNumberPanel() 
{ 
   if ( display != null ) { 
      	 
      ButtonComponent btn = null; 
      	 
   for ( int i = 0; i < numPanelText.length; i++ ) 
   { 
      btn = new ButtonComponent( numPanelText[i] );    
      btn.addActionListener( handler ); 
      btn.setFont( buttonfont ); 
      numButtonPanel.add( btn ); 
   } 	   	 
   } 
	 
return numButtonPanel; 
} 
  
/** 
* Method: 		createOperPanel 
* Description:	contructs and returns the calculator's number panel 
**/    
private Panel createOperPanel() 
{ 
    ButtonComponent btn = null; 
    	 
    for ( int i = 0; i < operPanelText.length; i++ ) 
    { 
    	btn = new ButtonComponent( operPanelText[i] ); 
    	btn.setFont( buttonfont );    
    	btn.addActionListener( handler );   
    	operButtonPanel.add( btn );	 
    } 
    	 
return operButtonPanel; 
} 
     
}