setbasedlg.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.*;
/*********************************
 *Dialog used to change the value*
 *of baseIncome in TaxCalculator *
 *@see TaxCalulator              *
 *********************************/
 class BaseDialog extends JDialog{
  private JLabel baseLabel=new JLabel("BaseIncome:");
  private JTextField baseJF=new JTextField(10);
  private JButton confirm=new JButton("  OK  ");
  private String baseValueString="1600.0";
  private boolean check,firstDec=false;
 /***************************************************************
  * Class implement ActionListener to respond to JButton action *
  ***************************************************************/
  class ButtonListener implements ActionListener{
	public void actionPerformed(ActionEvent e){
	  if(e.getSource()==confirm){
		check=true;
	    baseValueString=baseJF.getText();
	    /*****************************************
	     * Firstly check if the decimal is legal *
	     *****************************************/
		for(int i=0;i<baseValueString.length();i++){
	      if(baseValueString.charAt(i)=='.'){
		    if(firstDec){
			  check=false;
			  break;
			}
			else if(i!=0&&i!=baseValueString.length()-1)
			  firstDec=true;
			else{
			  check=false;
			  break;
			}
		  }
		  else if(!(48<=baseValueString.charAt(i)&&baseValueString.charAt(i)<=57)){
			 check=false;
			 break;
		  }
		}
		/*****************************************
		 *secondly confirm the string should only* 
		 *contain 0-9 except for the decimal.    *
		 *****************************************/
		if(!check){
		  JOptionPane.showMessageDialog(null,"Contains illegal charecters.Values RE:[0-9]+ . [0-9]*","ILLEGAL INPUTTING",JOptionPane.OK_OPTION);
		  baseJF.setText("");
		  baseJF.grabFocus();
		}
		else if(Double.parseDouble(baseValueString)<=0){
		  JOptionPane.showMessageDialog(null,"Please input a positive number!","Illegal Number",JOptionPane.OK_OPTION);
		    baseJF.setText("");
		    baseJF.grabFocus();
		  }
		/*******************************
		 *If success,dispose the dialog*
		 *******************************/
		else  dispose();
      }
	}
  }
  /**
   * Constructor
   * @param parent{@null}
   */
  public BaseDialog(JFrame parent){ 
	super(parent,"BaseIncome",true);
	baseJF.setText( baseValueString);
	Container cp=getContentPane();
	cp.setLayout(new FlowLayout(FlowLayout.CENTER,10,20));
	/**************************************************
	 *Add components into the Content Pane for Display*
	 **************************************************/
	cp.add(baseLabel);
	cp.add(baseJF);
	cp.add(confirm);
	/*************************
	 *Register ActionListener*
	 *************************/
	confirm.addActionListener(new ButtonListener());
    setSize(300,100);
  }
/**
 * Get base value as a String
 * @return String
 */
  public String getBaseValueString(){
	return baseValueString;
  }
}
/**
 * Load the Dialog into JApplet
 * @author ShanNa
 */
public class SetBaseDlg extends JApplet{
  BaseDialog dlg=new BaseDialog(null);
  String baseValue;
  public void init(){ 
	dlg.show();
	baseValue=dlg.getBaseValueString();
  }
  public String getBaseValue(){
	return baseValue;
  }
}