ch = (char)System.in.read(); //讀入一個(gè)字符，返回讀到的字節(jié)的int表示方式,讀到末尾返回-1

import java.io.*;
public class 字節(jié)流的緩沖區(qū) {
  public static void main(String[] args) throws Exception {
    FileInputStream in=new FileInputStream("E:\\photo\\IMG.jpg");
    //FileOutputStream中的文件不存在，將自動(dòng)新建文件
    OutputStream out=new FileOutputStream("E:\\test.jpg");
    byte[] buff=new byte[1024];
    int b;
    long beginTime=System.currentTimeMillis();
    while ((b=in.read(buff))!=-1) {
      out.write(buff,0,b);
    }
    long endTime=System.currentTimeMillis();
    System.out.println("運(yùn)行時(shí)長(zhǎng)為: "+(endTime-beginTime)+"毫秒");
    in.close();
    out.close();
    System.out.println("正常運(yùn)行！");
  }
}

//封裝了FileOutputStream管道之后，三種函數(shù)參數(shù)
//write(b) 寫入一個(gè)b
//write(byte[] b) 將字節(jié)數(shù)組全部寫入
//write(byte[] b,int off,int len) 例如write(byteTest,0,len)表示數(shù)組byteTest中從0開始長(zhǎng)度為len的字節(jié)
//一般都用第3個(gè)

import java.io.*;
public class 字節(jié)緩沖流 {
  public static void main(String[] args) throws Exception {
    BufferedInputStream bis=new BufferedInputStream(new FileInputStream("E:\\photo\\IMG.jpg"));
    BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("E:\\test.jpg"));
    int len;
    long begintime=System.currentTimeMillis();
    while((len=bis.read())!=-1) {
      bos.write(len);
    }
    long endtime=System.currentTimeMillis();
    System.out.println("運(yùn)行時(shí)間為："+(endtime-begintime)+"毫秒");
    bis.close();
    bos.close();
    System.out.println("正常運(yùn)行");
  }
}

import java.io.*;
public class outFile {
  public static void main(String[] args) throws Exception {
    FileOutputStream out=new FileOutputStream("example.txt");
    String str="測(cè)試";
    byte[] b=str.getBytes();
    for(int i=0;i<b.length;i++) {
      out.write(b[i]);
    }
    out.close();
    System.out.println("輸出成功");
  }
}

FileOutputStream out=new FileOutputStream("example.txt",true);