d2x.java

用java写的十进制到二进制

import java.awt.*; 
public class d2x extends Frame 
{ 
int decimalValue= 0; 
String baseXValue = new String("0"); 
TextField dDisplay,xDisplay; 
//d2x constructor 
d2x() 
{ 
super("Decimal Converter");//set the title of the frame 
MenuBar mb = new MenuBar(); 
Button d2Binary = new Button("Binary"); 
Button d2Octal = new Button("Octal"); 
Button d2Hex = new Button("Hex"); 
Button d2Base36 = new Button("Base36"); 
Panel p1 = new Panel(); 
Panel p2 = new Panel(); 
Panel p3 = new Panel(); 

//add a simple menu 
Menu m = new Menu("Application"); 
m.add(new CheckboxMenuItem("Base 36 Active")); 
m.add(new MenuItem("Exit")); 

//add menu to menubar 
mb.add(m); 
setMenuBar(mb);//install this menu bar in the frame 

//Add buttons to their own panel 
p3.setLayout(new FlowLayout()); 
p3.add(d2Binary); 
p3.add(d2Octal); 
p3.add(d2Hex); 
p3.add(d2Base36); 

//Add text fields 
Label dLabel = new Label("Enter Deecimal: "); 
Label xLabel = new Label("Converted Value: "); 
dDisplay = new TextField(Integer.toString(decimalValue),7); 
xDisplay = new TextField(baseXValue,32); 
xDisplay.setEditable(false); 
p1.setLayout(new FlowLayout(FlowLayout.LEFT)); 
p2.setLayout(new FlowLayout(FlowLayout.LEFT)); 
p1.add(dLabel); 
p1.add(dDisplay); 
p2.add(xLabel); 
p2.add(xDisplay); 

//Add the panels 
add("North",p1); 
add("Center",p2); 
add("South",p3); 
}//end d2x constructor 

public void start() 
{ 
resize(400,150); 
show(); 
} 

public void updateXDisplay() 
{ 
xDisplay.setText(baseXValue); 
} 

public boolean handleEvent(Event evt) 
{ 
if (evt.target instanceof MenuItem) 
{ 
if ("Exit".equals(((MenuItem)evt.target).getLabel())) 
{ 
hide(); 
dispose(); 
System.exit(0); 
return false; 
} 
return true; 
} 
else if(evt.target instanceof Button) 
{ 
String whick = ((Button)evt.target).getLabel(); 
if (whick.equals("Binary")) 
{ 
decimalValue = Integer.parseInt(dDisplay.getText()); 
baseXValue = Integer.toString(decimalValue,2); 
} 
if (whick.equals("Octal")) 
{ 
decimalValue = Integer.parseInt(dDisplay.getText()); 
baseXValue = Integer.toString(decimalValue,8); 
} 
if (whick.equals("Hex")) 
{ 
decimalValue = Integer.parseInt(dDisplay.getText()); 
baseXValue = Integer.toString(decimalValue,16); 
} 
if (whick.equals("36")) 
{ 
decimalValue = Integer.parseInt(dDisplay.getText()); 
baseXValue = Integer.toString(decimalValue,36); 
} 
updateXDisplay(); 
return true; 
} 
return false; 
} 


public static void main(String args[]) 
{ 
d2x m = new d2x(); 
m.start(); 
} 
}