package com.zhiru;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;public class ReadFromFile {	private String fName;	ReadFromFile(String s) {		fName = s;	}	public String read() throws IOException {		if (fName != null) {			File f = new File(fName);			InputStream in = new FileInputStream(f);			byte[] b = new byte[(int) f.length()];			int len = in.read(b);			in.close();			return new String(b, 0, len);		}		return null;	}}