数值计算基础_平方根法.pdf

importjava.awt.BorderLayout;

importjava.awt.Dimension;

importjava.awt.Toolkit;

importjava.awt.event.ActionEvent;

importjava.awt.event.ActionListener;

importjava.io.File;

importjava.io.FileNotFoundException;

importjava.io.FileReader;

importjava.text.NumberFormat;

importjava.util.Scanner;

importjavax.swing.JButton;

importjavax.swing.JFileChooser;

importjavax.swing.JFrame;

importjavax.swing.JPanel;

importjavax.swing.JTextArea;

importjavax.swing.filechooser.FileFilter;

publicclassSqrt

{

publicstaticvoidmain(String[]args)

{

JFrameframe=newMatrixFrame_Sqrt();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

}

classMatrixFrame_SqrtextendsJFrame

{

publicMatrixFrame_Sqrt()

{

setBounds((int)getScreenSize().width/4,(int)

getScreenSize().height/4,(int)getScreenSize().width/2,(int)

getScreenSize().height/2);

JPanelsouthPanel=newJPanel();

southPanel.add(chooseButton);

southPanel.add(startButton);

add(southPanel,BorderLayout.SOUTH);

textArea=newJTextArea();

textArea.setEditable(false);

add(textArea,BorderLayout.CENTER);

finalNumberFormatmyNumberFormat=

NumberFormat.getInstance();

myNumberFormat.setMinimumFractionDigits(3);

myNumberFormat.setMaximumFractionDigits(3);

fileChooser=newJFileChooser();

fileChooser.setFileFilter(newFileFilter()

{

publicbooleanaccept(Filef)

{

returnf.isDirectory()||||

}

publicStringgetDescription()

{

}

});