TheFileReadertakes the file name as the first parameter. The second parameter is the charset used. TheFileReaderis passed to theBufferedReader, which buffers read operations for better performance. This is a try
There are many ways to read a text file in java. Let’s look at java read text file different methods one by one.有许多方法可以读取Java中的文本文件。 让我们一一看一下Java读取文本文件的不同方法。1.Java使用Files类读取文本文件 2.使用FileReader读取Java中的文本文件 3.Java使用BufferedReader读取...
假设我们有一个名为textfile.txt的txt文件,其内容如下: Hello, world! This is a text file. It contains some random text. 1. 2. 3. 我们可以将上述代码保存为ReadTextFile.java,然后在命令行中编译和运行它。运行结果将输出txt文件的内容: Hello, world! This is a text file. It contains some rando...
= null; line = br.readLine()) { System.out.println(line); } br.close(); } public static final void readF2(String filePath) throws IOException { FileReader fr = new FileReader(filePath); BufferedReader bufferedreader = new BufferedReader(fr); String instring; while ((instring = ...
("foo.in"));will buffer the input from the specified file. 将会缓存指定的输入流. Without buffering, each invocation of read() or readLine() could cause bytes to be read from the file, converted into characters, and then returned, which can be very inefficient. 如果没有缓存,每次调用read(...
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System.out.println(getTotalLines(sourceFile)); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // 读取文件指定行。 static void readAppointedLineNumber(File sourceFile, int lineNumber) throws IOException { FileReader in = new FileReader(sourceFile); Line...
publicinterfaceExternalizableextendsjava.io.Serializable{voidwriteExternal(ObjectOutput out)throws IOException;voidreadExternal(ObjectInputin)throws IOException,ClassNotFoundException;} java.io.ObjectOutputStream类 表示对象输出流,它的writeObject(Object obj)方法可以对指定obj对象参数进行序列化,再把得到的字节序列写...
应该可以 -1是read（）方法的返回值。比如下面的代码：byte[] by=new byte[1024];FileInputStream filein=new FileInputStream("考场规则.txt");FileOutputStream fileout=new FileOutputStream("新生成.txt");while(filein.read(by)!=-1){ fileout.write(by);// fileout.write("\n");...
误以为readLine()是读取到没有数据时就返回null(因为其它read方法当读到没有数据时返回-1),而实际上readLine()是一个阻塞函数,当没有数据读取时,就一直会阻塞在那,而不是返回null;因为readLine()阻塞后,System.out.println(message)这句根本就不会执行到,所以在接收端就不会有东西输出。要想执行到System.out....