void mark(int readAheadLimit)
boolean markSupported();
void reset();
long skip(long n);
import java.io.*; public class FileOutputStreamTest { public static void main(String[] args) { try( // 创建字节输入流 FileInputStream fis = new FileInputStream("FileOutputStreamTest.java"); // 创建字节输出流 FileOutputStream fos = new FileOutputStream("newFile.txt")) { byte[] bbuf = new byte[32]; int hasRead = 0; // 循环从输入流中取出数据 while ((hasRead = fis.read(bbuf)) > 0 ) { // 每读取一次,即写入文件输出流,读了多少,就写多少。 fos.write(bbuf , 0 , hasRead); } } catch (IOException ioe) { ioe.printStackTrace(); } } }
import java.io.*; public class FileWriterTest { public static void main(String[] args) { try( FileWriter fw = new FileWriter("poem.txt")) { fw.write("首\r\n"); fw.write("第一行。\r\n"); fw.write("第二行。\r\n"); fw.write("第三行。\r\n"); fw.write("第四行。\r\n"); } catch (IOException ioe) { ioe.printStackTrace(); } } }
import java.io.*; public class PrintStreamTest { public static void main(String[] args) { try ( FileOutputStream fos = new FileOutputStream("test.txt"); PrintStream ps = new PrintStream(fos)) { // 使用PrintStream执行输出 ps.println("普通字符串"); // 直接使用PrintStream输出对象 ps.println(new PrintStreamTest()); } catch (IOException ioe) { ioe.printStackTrace(); } } }