package file;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;

public class Write_File 
{
    static FileOutputStream out ;     
    static FileOutputStream outSTr ;     
    static BufferedOutputStream Buff ;     
    static
 
 FileWriter fw ;  
    static int count=1000;//寫檔案行數     

    public static void main(String args[]) throws IOException
    {
        //可以用該方法記錄時間進行比較
        long start = System.currentTimeMillis(); // 記錄起始時間
        long end = System.currentTimeMillis();       // 記錄結束時間
        System.out.println(end-start+"ms"
 
);  

        //判斷輸出檔案是否存在
        File file=new File("G:/xxx.txt");   
        if(!file.exists())   
        {   
            file.createNewFile();   
        } 

        //1. FileOutputStream 寫檔案
        out = new FileOutputStream(new File("G:/xxx.txt"));   
        for (int i = 0; i < count; i++)     
            out.write("xxx"
 
.getBytes());    

        out.close();     

        //2. BufferedOutputStream 寫檔案
        outSTr = new FileOutputStream(new File("G:/xxx.txt"));     
        Buff=new BufferedOutputStream(outSTr);     
           // 等同於下面這行
           // Buff=new BufferedOutputStream(new FileOutputStream(new File("G:/xxx.txt")));  

        for (int i = 0; i < count; i++)
            Buff.write("xxx".getBytes());     

        Buff.flush();     
        Buff.close();     

        //3. FileWriter寫檔案
        fw = new FileWriter("G:/xxx.txt");     
        for (int i = 0; i < count; i++) 
            fw.write("xxx");     
        fw.close();       
    }
}