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import?javax.swing.*;

import?java.awt.*;

import?java.awt.event.*;

public?class?Main?extends?JFrame?implements?ActionListener{

LabledText?upperBase?=?new?LabledText("上底："),

62616964757a686964616fe59b9ee7ad9431333337373561lowerBase?=?new?LabledText("下底："),

height????=?new?LabledText("高：");

JButton?getArea???=?new?JButton("求梯形面積");

JTextArearesult????=?new?JTextArea();

public?Main()?{

super("梯形");

JPanel?main?=?new?JPanel();

main.setLayout(new?BorderLayout(10,?10));

JPanel?top??=?new?JPanel(),

base?=?new?JPanel();

top.setLayout(new?GridLayout(2,?2));

top.add(upperBase);

top.add(lowerBase);

top.add(height);

getArea.addActionListener(this);

top.add(getArea);

main.add(top,?BorderLayout.NORTH);

result.setBorder(BorderFactory.createLoweredBevelBorder());

JScrollPane?scroll?=?new?JScrollPane(result);

scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

scroll.setPreferredSize(new?Dimension(200,?100));

base.add(scroll);

main.add(base,?BorderLayout.CENTER);

main.setBorder(BorderFactory.createEmptyBorder(10,?10,?10,?10));

this.add(main);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setResizable(false);

this.pack();

this.setLocationRelativeTo(null);

this.setVisible(true);

}

public?void?actionPerformed(ActionEvent?arg0)?{

//?TODO?Auto-generated?method?stub

try?{

Trapezoid?trapezoid?=?new?Trapezoid(upperBase.getValue(),?lowerBase.getValue(),?height.getValue());

result.setText("梯形面積為：?"?+?String.valueOf(trapezoid.getArea()));

}?catch?(Exception?e)?{

result.setText(e.toString());

}

}

class?LabledText?extends?JPanel?{

JTextField?text?=?new?JTextField();

JLabellabel;

public?LabledText(String?nm)?{

this.setLayout(new?BorderLayout());

label?=?new?JLabel(nm);

label.setPreferredSize(new?Dimension(40,?30));

label.setHorizontalAlignment(JLabel.RIGHT);

this.add(label,?BorderLayout.WEST);

text.setPreferredSize(new?Dimension(60,?30));

this.add(text,?BorderLayout.EAST);

this.setBorder(BorderFactory.createEmptyBorder(5,?5,?5,?5));

}

public?double?getValue()?throws?Exception{

double?retval?=?Double.parseDouble(text.getText());

if(retval?

throw?new?Exception("長度不能為負數");

return?retval;

}

}

public?static?void?main(String[]?args)?{

new?Main();

}

}

class?Trapezoid?{

private?double?upperBase,?lowerBase,?height;

public?Trapezoid()?{}

public?Trapezoid(double?upperBase,?double?lowerBase,?double?height)?{

this.setUpperBase(upperBase);

this.setLowerBase(lowerBase);

this.setHeight(height);

}

public?double?getUpperBase()?{

return?upperBase;

}

public?void?setUpperBase(double?upperBase)?{

this.upperBase?=?upperBase;

}

public?double?getLowerBase()?{

return?lowerBase;

}

public?void?setLowerBase(double?lowerBase)?{

this.lowerBase?=?lowerBase;

}

public?double?getHeight()?{

return?height;

}

public?void?setHeight(double?height)?{

this.height?=?height;

}

public?double?getArea()?{

return?(upperBase?+?lowerBase)?*?height?/?2;

}

}

總結

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