字符和字节有什么区别,额……这个我也不知道。
1、基本操作实例
import java.io.*; public class CharDemo { public static void main(String[] args) { File f=new File("F:\\workspace\\Javaprj\\test.txt"); Writer out=null; Reader in=null; try { out=new FileWriter(f); String str="Hello World!!!"; out.write(str); System.out.println("The string "+"\"Hello World!!!\""+" has been written into "+f.getName()+"."); out.close(); in=new FileReader(f); char[] buf=new char[1024]; int num=in.read(buf); if(num!=-1) { System.out.println("The string \""+ new String(buf,0,num) +"\" has been read from the file "+f.getName()+"."); } else { System.out.println("The file \""+f.getName()+"\" is empty!"); } } catch(IOException e) { e.printStackTrace(); } } }
2、注意的问题
将out.close();注释掉
import java.io.*; public class CharDemo { public static void main(String[] args) { File f=new File("F:\\workspace\\Javaprj\\test.txt"); Writer out=null; Reader in=null; try { out=new FileWriter(f); String str="Hello World!!!"; out.write(str); System.out.println("The string "+"\"Hello World!!!\""+" has been written into "+f.getName()+"."); //out.close(); in=new FileReader(f); char[] buf=new char[1024]; int num=in.read(buf); if(num!=-1) { System.out.println("The string \""+ new String(buf,0,num) +"\" has been read from the file "+f.getName()+"."); } else { System.out.println("The file \""+f.getName()+"\" is empty!"); } } catch(IOException e) { e.printStackTrace(); } } }
java 字符流writer、reader基本操作及理解,布布扣,bubuko.com
时间: 2024-08-08 09:42:17