文件输入流 文件要放在 project目录下

package cha6;import java.io.*;public class TextFileReaderLine {String filename;FileReader fw;public TextFileReaderLine(String f) {filename = f;try {fw = new FileReader(new File(f));} catch (IOException e) {}}public void readLine(){char ch=' ';while(ch!='\n'){try{ch=(char)fw.read();System.out.print(ch);}catch(IOException e){System.out.print("error!");}}}public static void main(String[] args) {TextFileReaderLine frs=new TextFileReaderLine("text1.txt");frs.readLine();}}