wagecalculator.java

工资计算器,实现了简单的工资计算和调整,用户界面良好

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;

public class WageCalculator extends JFrame
{
    
	private JLabel hourlyWageJLabel;
	private JTextField hourlyWageJTextField;

	private JLabel hoursWorkedJLabel;
	private JTextField hoursWorkedJTextField;

    private JLabel grossWagesJLabel;
	private JTextField grossWagesJTextField;

    private JButton calculateJButton;

	public WageCalculator()
	{
		createUserInterface();
	}

	public void createUserInterface()
	{
		Container contentPane = getContentPane();

		contentPane.setLayout( null );

		hourlyWageJLabel = new JLabel();
		hourlyWageJLabel.setBounds( 16 , 16 , 90 , 21 );
		hourlyWageJLabel.setText( "Hourly wage:" );
		contentPane.add( hourlyWageJLabel );

		hourlyWageJTextField = new JTextField();
        hourlyWageJTextField.setBounds( 120 , 16 , 90 , 21 );
		hourlyWageJTextField.setHorizontalAlignment( JTextField.RIGHT );
		contentPane.add( hourlyWageJTextField );

		hoursWorkedJLabel = new JLabel();
        hoursWorkedJLabel.setBounds( 16 , 56 , 90 , 21 );
		hoursWorkedJLabel.setText( "Hours worked:" );
		contentPane.add( hoursWorkedJLabel );

        hoursWorkedJTextField = new JTextField();
		hoursWorkedJTextField.setBounds( 120 , 56 , 90 , 21 );
		hoursWorkedJTextField.setHorizontalAlignment( JTextField.RIGHT );
		contentPane.add( hoursWorkedJTextField );

        grossWagesJLabel = new JLabel();
		grossWagesJLabel.setBounds( 16 , 96 , 90 , 21 );
		grossWagesJLabel.setText( "Gross wages:" );
		contentPane.add( grossWagesJLabel );

        grossWagesJTextField = new JTextField();
		grossWagesJTextField.setBounds( 120 , 96 , 90 , 21 );
		grossWagesJTextField.setHorizontalAlignment( JTextField.RIGHT );
        grossWagesJTextField.setEditable( false );
		contentPane.add( grossWagesJTextField );

        calculateJButton = new JButton();
		calculateJButton.setBounds( 120 , 136 , 90 , 24 );
		calculateJButton.setText( "Calculate" );
		contentPane.add( calculateJButton );
		calculateJButton.addActionListener(
           new ActionListener()
		 {
			public void actionPerformed ( ActionEvent event )
			{
				calculateJButtonActionPerformed( event );
			}
		 }
		);

        setTitle( "Wage Calculator" );
		setSize( 230 , 200 );
		setVisible( true );
	}

	private void calculateJButtonActionPerformed( ActionEvent event )
	{
		double hourlyWage = Double.parseDouble( hourlyWageJTextField.getText() );
		double hoursWorked = Double.parseDouble( hoursWorkedJTextField.getText() );

		final double HOUR_LIMIT = 40.0 ;

		double wages;

		if ( hoursWorked <= HOUR_LIMIT )
		{
			wages = ( hoursWorked * hourlyWage );
		}
		else 
		{
			wages = HOUR_LIMIT * hourlyWage;

			wages +=( hoursWorked - HOUR_LIMIT ) * ( 1.5 * hourlyWage );
		}

		DecimalFormat dollars = new DecimalFormat( "$0.00" );

		grossWagesJTextField.setText( dollars.format( wages ) );
	}

	public static void main(String[] args) 
	{
		WageCalculator application = new WageCalculator();
		application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
	}
}