java大学教程11.pptVIP

JAVA语言程序设计;第十讲 多线程和对象的操作;第十一讲 Java I/O操作;概念;概念;概念;第十一讲 Java I/O操作;Java I/O类;Java I/O类;Java I/O类;Java I/O类;Java I/O类;Java I/O类;Java I/O类;Java I/O类;Java I/O类;第十一讲 Java I/O操作;Java I/O操作;输出: 控制台屏幕打印 class Test { public static void main(String args[]) { System.out.println(“Hello World!”); } };输入: 键盘读入 import java.io.IOException; class Test { public static void main(String args[]) throws IOException { byte[] b = new byte[10]; System.out.println(Received number= + System.in.read(b)); } };文件读/写流程 打开文件流 条件判断 读出/写入 关闭文件流 两种类型文件 FileInputStream/FileOutputStream (字节流) FileReader/FileWriter (字符流);文件字节流构造方法 public FileInputStream(File file) throws FileNotFoundException public FileInputStream(String name) throws FileNotFoundException java.io.File类: public File(String pathname) public FileOutputStream(File file) throws FileNotFoundException public FileOutputStream(File file, boolean append) throws FileNotFoundException //是否向已存在的文件后添加 public FileOutputStream(String name) throws FileNotFoundException public FileOutputStream(String name, boolean append) throws FileNotFoundException;文件读写-实例1;文件字符流构造方法 public FileReader(File file) throws FileNotFoundException public FileReader(String fileName) throws FileNotFoundException public File(String pathname) public FileWriter(File file) throws IOException public FileWriter(File file, boolean append) throws IOException public FileWriter(String fileName) throws IOException public FileWriter(String fileName, boolean append) throws IOException;文件读写-实例2;两类缓冲流 针对字节流 java.io.BufferedInputStream类 java.io.BufferedOutputStream类 针对字符流 java.io.BufferedReader类 java.io.BufferedWriter类;缓冲流构造方法 public BufferedInputStream(InputStream in) 2048 bytes public BufferedInputStream(InputStream in, int size) public BufferedOutputStream(OutputStream out) 512 bytes public BufferedOutputStream(OutputStream out, int size) public BufferedReader(Reader in) 8192 bytes public BufferedRea