编写仿认Windows记事本的小程序。

package IOPractice; 

import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.util.Scanner;  
/** * @program: java_project 
* @description: 字符流实现记事本 
* @author: liuliang 
* @create: 2019-04-21 10:52  
**/ 
public class Practice03 { 
    private static final int BUFFER_SIZE = 1024;   
        /** 
         * @param args  
        */  public static void main(String[] args) {
        FileWriter fw = null;   
        StringBuilder sb = new StringBuilder();   
        String str = null;  
        Scanner in = new Scanner(System.in);  
        in.useDelimiter("\n");//设置分隔符----一行以此作为分隔符  
        
        System.out.println("请输入，按Enter键换行输入:wq结束输入保存");  
        while(in.hasNext()){//判断是否继续有输入  
            str = in.nextLine(); //输入行可以包含空格、空行、且首行也可以输入是空行  
            if(str.equals(":wq")) { 
                break; 
            }
            sb.append(str);  
            str = null;  
        }
        in.close();  
        System.out.println("输入结束，正在保存...");  
        try {
            fw = new FileWriter("E:\\test.txt"); 
            char buf[] = sb.toString().toCharArray();  
            fw.write(buf, 0, buf.length);  
            System.out.println("保存成功");  
        } catch (Exception e) { 
            // TODO: handle exception  
            e.printStackTrace();  
        } finally { 
            if (fw != null) { 
                try {
                    fw.close();  
                } catch (IOException e) {
                    System.out.println("保存失败");  
                }
            }
        }
    }
}