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根据给定的 File 对象构造一个 FileWriter 对象
根据给定的文件名构造一个 FileWriter 对象
实例01: package cn.itcast04; import java.io.FileWriter; import java.io.IOException; public class FileWriterDemo01 { public static void main(String[] args) throws IOException { //创建IO对象 FileWriter fw = new FileWriter("d.txt" ); String s = "I love JAVA"; //写入字符串 fw.write( "Hello World"); //写入字符串的一部分 fw.write(s, 1,5); //写入字符数组 char[] chars = new char[]{ ‘a‘, ‘c‘, ‘b‘, ‘e‘}; fw.write(chars); //写入字符数组的一部分 fw.write(chars,0,3); fw.close(); } }
实例02: package cn.itcast04; import java.io.File; import java.io.FileReader; import java.io.IOException; public class FileReaderDemo01 { public static void main(String[] args) throws IOException { File file= new File("d.txt" ); FileReader fr = new FileReader(file); //读取单个字符 int c; while((c=fr.read())!=-1) { System. out.println((char)c); } fr.close(); System. out.println("================================" ); File file2= new File("d.txt" ); FileReader fr2 = new FileReader(file2); //读入一个数组 char[] chars = new char[( int)file2.length()]; int len; while((len=fr2.read(chars))!=-1) { String s = new String(chars,0,len); System. out.println(s); } fr2.close(); } }
JavaIO(04)字符流--Writer and Reader
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原文地址:http://www.cnblogs.com/qlwang/p/5613744.html