taxvalue.java

计算个人所得税 GUI界面

package src;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.*;
/**************************************************************
 * Class  implements JDialog to get the amount and rate values*
 * in order to insert a new item into @see TaxLevelTable or to*
 * update a item in the @see TaxLevelTable.                   *
 **************************************************************/
class ValueDialog extends JDialog{
  JLabel amountLabel=new JLabel("Amount:"),rateLabel=new JLabel("Rate:");
  JTextField amountJF=new JTextField(10),rateJF=new JTextField(10);
  JButton confirm=new JButton("  OK  ");
  String amount,rate;
  double preAmount,preRate,nextAmount,nextRate;
  /**************************************************************
   * Class implement ActionListener to respond to JButton action*
   **************************************************************/
  class ButtonListener implements ActionListener{
	public void actionPerformed(ActionEvent e){
	  if(e.getSource()==confirm){	
	    boolean firstCheck=true;
		amount=amountJF.getText();
	    rate=rateJF.getText();
	    boolean rateDec=false,amouDec=false;
	    for(int i=0;i<rate.length();i++){
	      /***************************************
	       *Firstly check if the decimal is legal*
	       ***************************************/
	      if(rate.charAt(i)=='.'){
	        if(rateDec){
	          firstCheck=false;
	    	  break;
	    	}
		  else if(i!=0&&i!=rate.length()-1)
			rateDec=true;
			else {
			  firstCheck=false;
			  break;
			}
		  }
	      /******************************************************
	       *Secondly check if other charters are between 0 and 9*
	       ******************************************************/
		 else if(!(48<=rate.charAt(i)&&rate.charAt(i)<=57)){
           firstCheck=false;
           break;
		 }
	   }
	   if(firstCheck){
		 for(int i=0;i<amount.length();i++)
		   if(amount.charAt(i)=='.'){
		     if(amouDec){
			   firstCheck=false;
			   break;
			 }
			 else if(i!=0&&i!=amount.length()-1)
			   amouDec=true;
			   else{
			      firstCheck=false;
			      break;
			    }
			  }
			  else if(!(48<=amount.charAt(i)&&amount.charAt(i)<=57)){
			    firstCheck=false;
		        break;
		      }
			}
	        /***********************************************************
	         *If the inputting string is illegal,prompt a MessageDialog*
	         *for reminding,and then wait for the next inputting       *   
	         ***********************************************************/
			if(!firstCheck){
		      JOptionPane.showMessageDialog(null,"Contains illegal charecters.Values RE:[0-9]+ . [0-9]*","ILLEGAL INPUTTING",JOptionPane.OK_OPTION);
		      amountJF.setText("");
		      rateJF.setText("");
		      amountJF.grabFocus();
			}
			/**********************************************************
	         *If the inputting string is legal,then check if the value* 
	         *is between its two neighbors in the @see TaxTableLevel  *                            *   
	         **********************************************************/
			else{
			  if(Double.parseDouble(amount)<=nextAmount||Double.parseDouble(amount)>=preAmount){
	          JOptionPane.showMessageDialog(null,"Amount:   "+nextAmount+" < Amount < "+preAmount+"     Input again!","Illegal Number",JOptionPane.OK_OPTION);
		      amountJF.setText("");
		      amountJF.grabFocus();
		    }
			else if(Double.parseDouble(rate)<=nextRate||Double.parseDouble(rate)>=preRate){
			   JOptionPane.showMessageDialog(null,"Rate:    "+nextRate+" < Rate < "+preRate+"      Input again!","Illegal Number",JOptionPane.OK_OPTION);
			   rateJF.setText("");
			   rateJF.grabFocus();
			 }
			 else dispose();
		   }	
		 }
	   }
	 }
     /************************************************
      *Create a instance for the class ButtonListener*
      ************************************************/ 
	 ButtonListener bl=new ButtonListener();
	 public ValueDialog(JFrame parent,String amValue,String raValue,double nextAmount,double preAmount,double nextRate,double preRate){ 
	   super(parent,"TaxLevel",true);
	   this.preAmount=preAmount;
	   this.preRate=preRate;
	   this.nextAmount=nextAmount;
	   this.nextRate=nextRate;
	   amount=amValue;
	   rate=raValue;
	   amountJF.setText(amount);
	   rateJF.setText(rate);
	   Container cp=getContentPane();
	   cp.setLayout(new FlowLayout(FlowLayout.CENTER,10,20));
	   /*******************************************
	    *Add items to the Content Pane for display*
	    *******************************************/
	   cp.add(amountLabel);
	   cp.add(amountJF);
	   cp.add(rateLabel);
	   cp.add(rateJF);
	   cp.add(confirm);
	   /**************************
	    *Register event listeners*
	    **************************/
	   confirm.addActionListener(bl);
	   setSize(400,125);
	 }
	 public String getAmount(){
	   return amount;
	 }
	 public String getRate(){
	   return rate;		
	 }
   }
   /******************************************
    *Package the ValueDialog into the JApplet*
    ******************************************/
   public class TaxValue extends JApplet{
   String amountValue,rateValue;
   double preAmount,preRate,nextAmount,nextRate;
   public TaxValue(){
	 amountValue="0.0";
	 rateValue="0.0";
   }
   /**
    * Constructor
    * @param amount String 
    * @param rate String 
    * @param nextAmount double
    * @param preAmount double
    * @param nextRate double 
    * @param preRate double 
    */
   public TaxValue(String amount,String rate,double nextAmount,double preAmount,double nextRate,double preRate){
	 amountValue=amount;
	 rateValue=rate;
	 this.preAmount=preAmount;
	 this.preRate=preRate;
	 this.nextAmount=nextAmount;
	 this.nextRate=nextRate;	
   }
   public void init(){ 
	 ValueDialog dlg=new ValueDialog(null,amountValue,rateValue,nextAmount,preAmount,nextRate,preRate);
	 dlg.show();
	 amountValue=dlg.getAmount();
	 rateValue=dlg.getRate();
   }
   /**
    * Get the tax amount of certain level 
    * @return String
    */
   public String GetTaxValue(){
	 return amountValue;
   }
   /**
    * Get the tax rate of certain level
    * @return String
    */
   public String GetRateValue(){
	 return rateValue;
   }
 }