import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Vector;
import javax.swing.DefaultListModel;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JList;
import javax.swing.JButton;
import javax.swing.ListModel;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.JScrollBar;
public class testIO extends JFrame implements ActionListener {
private JPanel contentPane;
private JTextField number;
private JButton input;
private int num;
private DefaultListModel listModel,list;
private Vector<Double> v;
private JList fudian1;
private JList fudian2;
private JButton anwser;
private JButton btnSave;
private double a[];
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
testIO frame = new testIO();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public testIO() {
v=new Vector<Double>();
setForeground(Color.GREEN);
setTitle("\u6D6E\u70B9\u6570\u6392\u5E8F");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblIdhu = new JLabel("\u6D6E\u70B9\u6570\u4E2A\u6570");
lblIdhu.setBounds(57, 65, 75, 22);
contentPane.add(lblIdhu);
number = new JTextField();
number.setBounds(57, 125, 66, 21);
contentPane.add(number);
number.setColumns(10);
input = new JButton("\u8F93\u5165");
input.setBounds(57, 201, 75, 23);
input.addActionListener(this);
contentPane.add(input);
listModel = new DefaultListModel();
list = new DefaultListModel();
fudian1 = new JList(listModel);
fudian1.setValueIsAdjusting(true);
JScrollPane j = new JScrollPane(fudian1);
j.setBounds(155, 91, 66, 133);
contentPane.add(j);
fudian2 = new JList(list);
JScrollPane j2 = new JScrollPane(fudian2);
j2.setBounds(284, 91, 66, 133);
contentPane.add(j2);
anwser = new JButton("\u6253\u5F00...");
anwser.setBounds(95, 10, 75, 23);
anwser.addActionListener(this);
contentPane.add(anwser);
btnSave = new JButton("\u4FDD\u5B58..");
btnSave.setBounds(257, 10, 93, 23);
btnSave.addActionListener(this);
contentPane.add(btnSave);
JLabel label = new JLabel("\u6392\u5E8F\u4E4B\u524D");
label.setBounds(156, 69, 54, 15);
contentPane.add(label);
JLabel label_1 = new JLabel("\u6392\u5E8F\u4E4B\u540E");
label_1.setBounds(284, 69, 54, 15);
contentPane.add(label_1);
JLabel lblTip = new JLabel("tip\uFF1A\u8BF7\u5148\u8F93\u5165\u6D6E\u70B9\u6570\u4E2A\u6570\uFF0C\u6216\u8005\u6253\u5F00\u6587\u4EF6");
lblTip.setVerticalAlignment(SwingConstants.TOP);
lblTip.setFont(new Font("微软雅黑", Font.PLAIN, 12));
lblTip.setBounds(95, 234, 300, 18);
contentPane.add(lblTip);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==input){
listModel.removeAllElements();
String s = number.getText();
num = Integer.parseInt(s);
for(int i=1;i<=num;i++){
String name="请输入第"+i+"个数";
String ss= JOptionPane.showInputDialog(name);
listModel.addElement(Double.parseDouble(ss));
v.add(Double.parseDouble(ss));
}
}
if(e.getSource()==btnSave){
save();
}
if(e.getSource()==anwser){
v.removeAllElements();
String name="请输入文档路径 'c:\txt' ";
String ss= JOptionPane.showInputDialog(name);
File file = new File(ss);
try {
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
try {
String s, s2 = new String();
while ((s = br.readLine()) != null) {
s2 += s + "\n ";
v.add(Double.parseDouble(s));
}
br.close();
System.out.println(s2);
System.out.println("OK?");
for(int i=0;i<v.size();i++){
System.out.println(v.elementAt(i));
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
int i,j;
double temp;
num=v.size();
String g = ""+num;
number.setText(g);
a=new double[num];
listModel.removeAllElements();
for(i=0;i<num;i++){
a[i]=v.elementAt(i);
listModel.addElement(a[i]);
}
for(i=0;i<num-1;i++)
for(j=i+1;j<num;j++)
if(a[i]>a[j]) {
temp=a[i];
a[i]=a[j];
a[j]=temp;
}
v.removeAllElements();
for(i=num-1;i>=0;i--){
System.out.println(a[i]);
list.addElement(a[i]);
v.addElement(a[i]);
}
try {
FileWriter writer = new FileWriter(ss, true);
for(i=0;i<v.size();i++){
double k=v.elementAt(i);
String sss = k+"\r\n";
writer.write(sss);
System.out.println(k);
}
writer.close();
} catch (IOException e1) {
e1.printStackTrace();
}
/*
PrintWriter pw = null;
try {
pw = new PrintWriter(new FileWriter(ss));
for(i=0;i<v.size();i++){
double k=v.elementAt(i);
pw.print(k+"\r\n");
System.out.println(k);
}
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}finally {
if(pw != null) {
pw.close();
pw = null;
}
}
*/
}
}
public void save(){
String name="请输入保存文档路径 'c:\txt' ";
String ss= JOptionPane.showInputDialog(name);
PrintWriter pw = null;
try {
pw = new PrintWriter(new FileWriter(ss));
for(int i=0;i<v.size();i++){
double k=v.elementAt(i);
pw.print(k+"\r\n");
System.out.println(k);
}
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}finally {
if(pw != null) {
pw.close();
pw = null;
}
}
}
}
原文：http://blog.csdn.net/u013076044/article/details/45691091