java檔案讀寫常用方法

標籤：nan   exec   reader   buffered   auto   exe   none   space   cep   

// TODO Auto-generated method stub
//File file = new File("D:\\Android\\workspace\\Practice1\\src\\test4", "new1.txt");
//String str = file.getName();
//file.delete();

//try{
//Runtime rt = Runtime.getRuntime();
//
//File file = new File("D:\\Program Files (x86)\\CodeBlocks", "codeblocks.exe");
//System.out.println("開啟codeblocks");
//rt.exec(file.getAbsolutePath());
//file = new File("D:\\酷狗\\KGMusic", "KuGou.exe");
//System.out.println("開啟酷狗");
//rt.exec(file.getAbsolutePath());
//file = new File("D:\\淨網大師\\ADSafe", "ADSafeSvc.exe");
//System.out.println("開啟淨網大師");
//rt.exec(file.getAbsolutePath());
//}catch(Exception e){
//System.out.println(e);
//}


//try{
//File f = new File("D:\\Android\\workspace\\Practice1\\src\\test4", "file.txt");
//FileInputStream in = new FileInputStream(f);
//int n = -1;
//byte [] a= new byte[100];
//
//while((n = in.read(a, 0, 100)) != -1){
//String s = new String(a, 0, n);
//System.out.print(s);
//}
//in.close();
//}
//catch(Exception e){
//System.out.println(e);
//}

//try{
//byte []b = "我是你爸爸".getBytes();
//File file = new File("D:\\Android\\workspace\\Practice1\\src\\test4", "empty.txt");
//FileOutputStream out = new FileOutputStream(file);
//out.write(b);
//out.close();
//out = new FileOutputStream(file, true);
//b = "，當檔案字元輸出資料流的構造方法中有true參數時，可以在檔案末尾追加文字".getBytes();
//out.write(b);
//
//out.close();
//
//}
//catch(Exception e){
//System.out.println(e);
//}

//byte []b = "我是你大爺".getBytes();
//System.out.println(b);

//File sourceFile = new File("D:\\Android\\workspace\\Practice1\\src\\test4","a.txt");
//File targetFile = new File("D:\\Android\\workspace\\Practice1\\src\\test4","b.txt");
//
//char c[] = new char[19];
//try{
//Reader in = new FileReader(sourceFile);
//Writer out = new FileWriter(targetFile, true);
//int n = -1;
//while((n = in.read(c))!= -1){
//out.write(c, 0, n);
//}
//out.flush();//使緩衝區的內容馬上寫入目的地
//out.close();
//}catch(Exception e){
//System.out.println(e);
//
//}

//try{
//
//FileReader inOne = new FileReader("D:\\Android\\workspace\\Practice1\\src\\test4\\a.txt");
//BufferedReader bufferedRead = new BufferedReader(inOne);
//
//FileWriter tofile = new FileWriter("D:\\Android\\workspace\\Practice1\\src\\test4\\to.txt");
//BufferedWriter bufferedWrite = new BufferedWriter(tofile);
//
//String str = null;
//
//while((str = bufferedRead.readLine()) != null){
//StringTokenizer fenxi = new StringTokenizer(str);
//str = str + "單詞個數:" + fenxi.countTokens();
//bufferedWrite.write(str);
//bufferedWrite.newLine();
//}
//
//bufferedWrite.close();
//tofile.close();
//bufferedRead.close();
//inOne.close();
//
//
//}
//catch(Exception e){
//System.out.println(e);
//}

//
//RandomAccessFile inAndOut = null;
//int data[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 111};
//try{
//inAndOut = new RandomAccessFile("D:\\Android\\workspace\\Practice1\\src\\test4\\random.txt", "rw");
//for(int i = 0; i < data.length; i++){
//inAndOut.writeInt(data[i]);
//}
//
//for(long i = data.length - 1; i >= 0; i--){
//inAndOut.seek(i * 4);
//System.out.printf("\t%d", inAndOut.readInt());
//}
//inAndOut.close();
//}catch(Exception e){
//System.out.println(e);
//}
//

System.out.println(Math.round(-13.4));
char 壞 = ‘壞‘;

ok:while(true){
while(true){
System.out.println("我只迴圈一次");
break ok;
}
}

int num = (int)Math.random() * 100;


//break String s = null;
//char 好 = 壞;

}

java檔案讀寫常用方法