taxcalculator.java

计算个人所得税 GUI界面

import src.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.*;
import javax.swing.border.*;
/**The  TaxCalculator for computing Tax Payment in java 
 * @author  ShanNa CSA_05 
 * @version 2.0,2008-3-21
 * @since JDK1.5
 * @see Console
 * @see TaxLevelTable
 * @see SetBaseDlg
 * @see TaxValue
 */
public class TaxCalculator extends JApplet{
   
	/************************************
	 *Declare some basic type attributes*
	 ************************************/
	private double baseIncome;
	private double income;
	private double taxPayable;
	private double payment;
	private double amount,rate;
	private double highAmount,lowAmount,highRate,lowRate;
	private String amountStr,rateStr;
	private String[] listString;
	private int listSelectIndex;
	private int itemNum;
	private TaxLevelTable tlt=new TaxLevelTable();
	/***********************************
	 *Declare the components attributes*
	 ***********************************/
	private DefaultListModel lItems=new  DefaultListModel();
	private JList taxTableList=new JList(lItems);
	private JScrollPane jsp = new JScrollPane(taxTableList,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
	private JButton
	  modifyBase=new JButton("Modify"),
	  updateItem=new JButton("Update"),
	  deleteItem=new JButton("Delete"),
	  insertItem=new JButton("Insert"),
	  result=new JButton("Result");
	private JPanel jp1=new JPanel(),jp2=new JPanel(),jp3=new JPanel(),
	               jp4=new JPanel(),jp5=new JPanel(),jp6=new JPanel();
	private JLabel
	  baseLb=new JLabel("RevenueBase:"),
	  inputLb=    new JLabel("Income:        "),
	  taxAmountLb=new JLabel("Tax Amount:"),
	  taxTableLb=new JLabel("--------------------------Tax   payable   rules--------------------------\n");
	private JTextField 
	  baseTF=new JTextField(10),
	  taxAmountTF=new JTextField(10),
	  incomeTF=new JTextField(10); 
    /**************************************************************
	 * Class implement ActionListener to respond to JButton action*
	 **************************************************************/
    class ButtonListener implements ActionListener{	
     /** 
      * Respond to JButton action
      * @throws ArrayOutOfBoundsException
      * @return No return value
      * @param e ActionEvent
      */
	  public void actionPerformed(ActionEvent e){
	   try{
		/**********************************************
		 * update a item in the @see TaxLevelTable tlt*
		 * Constraints:the new values must between its*
		 * two neighbors.                             *
		 * ********************************************/
		if(e.getSource()==updateItem){
		TaxLevel tl=tlt.getTaxLevel(listSelectIndex-1);
    	if(listSelectIndex>1){
    	  highAmount=tlt.getTaxLevel(listSelectIndex-2).getAmount();
    	  highRate=tlt.getTaxLevel(listSelectIndex-2).getRate();
		}
		else if(listSelectIndex==1){
		  highAmount=100000000;
		  highRate=1.0;
	    }
		if(listSelectIndex<itemNum+1){
		  lowAmount=tlt.getTaxLevel(listSelectIndex).getAmount();
		  lowRate=tlt.getTaxLevel(listSelectIndex).getRate();
		}
		else{
		  lowAmount=0.0;
		  lowRate=0.0;
	    }
		TaxValue dlg=new TaxValue(String.valueOf(tl.getAmount()),String.valueOf(tl.getRate()),lowAmount,highAmount,lowRate,highRate);
		Console.run(dlg, 400,125);
		amountStr=dlg.GetTaxValue();
		rateStr=dlg. GetRateValue();
	    amount=Double.parseDouble(amountStr);
	    rate=Double.parseDouble(rateStr);
	    tlt.update(listSelectIndex-1, amount, rate);
	    lItems.clear();
	    listDisplay();
	  } 
		/*************************************************
		 * Insert a new item into  @see TaxLevelTable tlt*
		 * Constraints:the new values must between its   * 
		 * two neighbors.                                *
		 * ********************************************* */
	    if(e.getSource()==insertItem){
		  if(listSelectIndex>1){
		    highAmount=tlt.getTaxLevel(listSelectIndex-2).getAmount();
	        highRate=tlt.getTaxLevel(listSelectIndex-2).getRate();
		   }
		   else{
		     highAmount=100000000;
			 highRate=1.0;
		   }
		   if(listSelectIndex<itemNum+1){
			  lowAmount=tlt.getTaxLevel(listSelectIndex-1).getAmount();
			  lowRate=tlt.getTaxLevel(listSelectIndex-1).getRate();
		    }
			else{
			  lowAmount=0.0;
			  lowRate=0.0;
			}
			TaxValue dlg=new TaxValue("0.0","0.0",lowAmount,highAmount,lowRate,highRate);
			Console.run(dlg, 400,125);
			amountStr=dlg.GetTaxValue();
			rateStr=dlg. GetRateValue();
			amount=Double.parseDouble(amountStr);
			rate=Double.parseDouble(rateStr);
			tlt.insert(new TaxLevel(amount,rate),listSelectIndex-1);
			lItems.clear();
			listDisplay();
		  }
	      /***********************************
	       *Delete a item from @TaxLevelTable* 
	       ***********************************/
		  if(e.getSource()==deleteItem){
			tlt.delete(listSelectIndex-1);
			lItems.clear();
			listDisplay();
		  }
	    } catch(ArrayIndexOutOfBoundsException er){
		  JOptionPane.showMessageDialog(null,"INDEX OUT OF BOUNDS EXCEPTION!","ERRORS!",JOptionPane.OK_OPTION);
	    }
	    /*************************
	     *Modify the basic income*
	     *************************/
	    if(e.getSource()==modifyBase){
		  SetBaseDlg dlg=new SetBaseDlg();
		  String value;
		  Console.run(dlg, 300,100);	
		  value=dlg.getBaseValue();
		  baseTF.setText(value);
		  baseIncome=Double.parseDouble(value);
	    }
	    /****************************************
	     *Show the tax payment of certain income* 
	     ****************************************/
	    if(e.getSource()==result){
		  payment=0;
		  income=Double.parseDouble(incomeTF.getText());
		  taxPayable=income-baseIncome;	
		  int i=0;
		  while(i<itemNum){
		    if(taxPayable>tlt.getTaxLevel(i).getAmount()){
			  payment+=(taxPayable-tlt.getTaxLevel(i).getAmount())*tlt.getTaxLevel(i).getRate();
			  taxPayable=tlt.getTaxLevel(i).getAmount();
		    }
		    i++;
		  }
		  taxAmountTF.setText(String.valueOf(payment));
	    }
	  }
    }
    /*************************************************************************
     * Class implement SelectionListener to respond to JList Selection Action*
     *************************************************************************/
    class listLisener implements ListSelectionListener{
      public void valueChanged(ListSelectionEvent e){
        listSelectIndex=taxTableList.getSelectedIndex();
      }
    } 
    /** Modify DefaultListModel items to change the Strings in JList
     * @return No return value
     * @exception exceptions No exceptions thrown
     */
	public void listDisplay(){
	  itemNum=tlt.getCount();
	  listString=new String[itemNum];
	  listString=tlt.toStrings();
	  lItems.add(0,"   Level              Amount             TaxRate   ");
	  for(int i=0;i<itemNum;i++)
	    lItems.add(i+1,listString[i]);	
	  }
	private ButtonListener b1=new ButtonListener();
	public void init(){
	  //Give baseIncome a default value
      baseIncome=1600.0;
      /*************************************************
       *Add the first five items to @see TaxLevelTable*
       *************************************************/
	  tlt.insert(new TaxLevel(20000,0.25),0);
	  tlt.insert(new TaxLevel(5000,0.2),1);
	  tlt.insert(new TaxLevel(2000,0.15),2);
      tlt.insert(new TaxLevel(500,0.1),3);
	  tlt.insert(new TaxLevel(0,0.05),4);
	  /*******************************************************
	   *Add the strings from @see TaxLevelTable  to the List *
	   *******************************************************/
	  listDisplay();
	  Container cp=getContentPane();
      cp.setLayout(new FlowLayout(FlowLayout.LEFT,10,15));
      // TextFields only used to display values
	  taxAmountTF.setEditable(false);
	  baseTF.setEditable(false);
	  /*********************************
	   * Give TextFields default values*
	   *********************************/
	  baseTF.setText("1600.0");
	  taxAmountTF.setText("0.0");
	  /*******************************
	   *Create borders for components*
	   *******************************/
	  Border brd=BorderFactory.createMatteBorder(1, 1, 2,2,Color.BLACK);
	  taxTableList.setBorder(brd);
	  taxAmountTF.setBorder(brd);
	  baseTF.setBorder(brd);
	  /****************************************
	   *Set Layout Style for the Content Panes*
	   ****************************************/
      jp1.setLayout(new FlowLayout(FlowLayout.LEFT,10,5));
	  jp2.setLayout(new FlowLayout(FlowLayout.LEFT,10,5));
	  jp3.setLayout(new FlowLayout(FlowLayout.LEFT,60,5));
	  jp4.setLayout(new FlowLayout(FlowLayout.CENTER,35,5));
	  jp5.setLayout(new FlowLayout(FlowLayout.LEFT,10,5));
	  jp6.setLayout(new FlowLayout(FlowLayout.LEFT,10,5));
	  /********************************************
	   *Add items to the Content Panes for display*
	   ********************************************/
	  jp1.add(baseLb);
	  jp1.add(baseTF);
	  jp1.add(modifyBase);
	  jp2.add(taxTableLb);
	  jp3.add(jsp);
	  jp4.add(updateItem);
	  jp4.add(deleteItem);
	  jp4.add(insertItem);
	  jp5.add(inputLb);
	  jp5.add(incomeTF);
	  jp6.add(taxAmountLb);
	  jp6.add(taxAmountTF);
	  jp6.add(result);
	  /*****************************************************************
	   *Add the Content Panes to the top-level Content Pane for Display*
	   *****************************************************************/
	  cp.add(jp1);
	  cp.add(jp2);
	  cp.add(jp3);
	  cp.add(jp4);
	  cp.add(jp5);
	  cp.add(jp6);
      /**************************
       *Register event listeners*
       **************************/
	  taxTableList.addListSelectionListener(new listLisener());
	  updateItem.addActionListener(b1);
	  insertItem.addActionListener(b1);
	  deleteItem.addActionListener(b1);
	  modifyBase.addActionListener(b1);
	  result.addActionListener(b1);
	}
	/** Sole entry point to class & application
     * @param  args array of string arguments
     * @return No return value
     * @throws NullPointerException
     */ 
	public static void main(String[] args){
	  /********************************************
	   *Set JApplet Looking according to user's OS* 
	   ********************************************/
      try{
		UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());		
	  } catch(Exception e){
		e.printStackTrace();
	  }
	  /*****************
	   *Run the JApplet* 
	   *****************/
	  Console.run(new TaxCalculator(), 400, 500);
	  }
   }