java实验报告（图形界面编程及文件读写）

《Java程序设计》实 验 报 告（三）

所使用的工具软件及环境：
环境：Windows 8.1;jdk 1.8;
工具：eclipse

实验目的：
1、掌握图形界面编程及输入输出流类。
2、了解Java 系统包的结构。
3、掌握不同类型的输入输出流类，标准数据流、文件流、数据输入输出流、对象流等。

实验内容：
编写图形界面程序，接受用户输入的5个浮点数据和一个文件目录名，将这5个数据保存在该文件中，再从文件中读取出来并且进行从大到小排序，然后再一次追加保存在该文件中。
源程序：

import java.awt.BorderLayout;
import java.util.Arrays;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.awt.event.ActionEvent;

public class simple extends JFrame {
private JPanel contentPane;
private JTextField textField;
private final JTextField textField_1 = new JTextField();
private JTextField textField_2;
private JTextField textField_3;
private JTextField textField_4;
private JTextField textField_5;

/**
 * Launch the application.
 */

public static void main(String[] args) {
	EventQueue.invokeLater(new Runnable() {
		public void run() {
			try {
				simple frame = new simple();
				frame.setVisible(true);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	});
}
/**
 * Create the frame.
 */

public static boolean isNumber(String str){
	String reg = "^[0-9]+(.[0-9]+)?$";
	return str.matches(reg);
}

public static boolean isNumeric(String str){  
	  for (int i = str.length();--i>=0;){    
	   if (!Character.isDigit(str.charAt(i))){  
	    return false;  
	   }  
	  }  
	  return true;  
	} 

public int count=0;
private JButton btnNewButton_2;

public simple() {
	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);
	textField = new JTextField();
	textField.setBounds(22, 24, 66, 21);
	contentPane.add(textField);
	textField.setColumns(10);
	textField_1.setBounds(97, 24, 66, 21);
	contentPane.add(textField_1);
	textField_1.setColumns(10);

	textField_2 = new JTextField();
	textField_2.setBounds(173, 24, 66, 21);
	contentPane.add(textField_2);
	textField_2.setColumns(10);
	
	textField_3 = new JTextField();
	textField_3.setBounds(257, 24, 66, 21);
	contentPane.add(textField_3);
	textField_3.setColumns(10);
	
	textField_4 = new JTextField();
	textField_4.setBounds(345, 24, 66, 21);
	contentPane.add(textField_4);
	textField_4.setColumns(10);
	final double[] arr1=new double[5];
	
	JButton btnNewButton = new JButton("\u8F93\u5165");
	btnNewButton.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
			String s1=textField.getText();
			String s3=textField_1.getText();
			String s4=textField_2.getText();
			String s5=textField_3.getText();
			String s6=textField_4.getText();
            if(isNumber(s1)==true)
			{
				arr1[0]=Double.parseDouble(s1);
				textField.setText("");	
			
			}
			else
			   textField.setText("");
            if(isNumber(s3)==true)
			{
				arr1[1]=Double.parseDouble(s3);
				textField_1.setText("");	
	
			}
			else
			   textField_1.setText("");
            if(isNumber(s4)==true)
			{
				arr1[2]=Double.parseDouble(s4);
				textField_2.setText("");	
			
			}
			else
			   textField_2.setText("");
            if(isNumber(s5)==true)
			{
				arr1[3]=Double.parseDouble(s5);
				textField_3.setText("");	
			
			}
			else
			   textField_3.setText("");
            if(isNumber(s6)==true)
			{
				arr1[4]=Double.parseDouble(s6);
				textField_4.setText("");	
			
			}
			else
			   textField_4.setText("");
           
			//五次之后按钮失效
			
		}
	});
	btnNewButton.setBounds(142, 55, 97, 23);
	contentPane.add(btnNewButton);
	
	textField_5 = new JTextField();
	textField_5.setBounds(22, 101, 107, 21);
	contentPane.add(textField_5);
	textField_5.setColumns(10);
	
	JButton btnNewButton_1 = new JButton("\u4FDD\u5B58\u6587\u4EF6");
	btnNewButton_1.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
			try {
				String s2=textField_5.getText();
				//label_2.setText(s2);
				File outFile=new File(s2);
				FileWriter fos=new FileWriter(outFile);
				for(int c=0;c=0;d--)						
				{
					fos.write(String.valueOf(arr2[d])+"\r\n");
				}
				fos.close();
				br.close();
				
			} catch (FileNotFoundException e1) {
	
				e1.printStackTrace();
			} catch (NumberFormatException e1) {
		
				 e1.printStackTrace();
			} catch (IOException e1) {
			
				 e1.printStackTrace();
			}
			
			
		}
	});
	btnNewButton_2.setBounds(122, 168, 97, 23);
	contentPane.add(btnNewButton_2);
}

}