However, the Scanner class is slow and may cause a "timelimit exceeded". We can read the input faster with the BufferedReader class. The class "MyScanner" below uses a BufferedReader. The same method names as in the Scanner class have been chosen, e.g. to read the input as an intege...
创建InputStream创建InputStreamReader创建BufferedReader读取数据结束 步骤详解 创建InputStream:首先我们需要创建一个InputStream对象,该对象可以从控制台、文件、网络等不同来源获取输入流。例如,我们可以通过以下代码创建一个从文件中读取的InputStream对象: FileInputStreamfis=newFileInputStream("input.txt");InputStreami...
1. 关于InputStream.read() 在从数据流里读取数据时,为图简单,经常用InputStream.read()方法。这个方法是从流里每次只读取读取一个字节,效率会非常低。 更好的方法是用InputStream.read(byte[] b)或者InputStream.read(byte[] b,int off,int len)方法,一次读取多个字节。 2. 关于InputStream类的available()...
packagecom.gxlee;importjava.io.FileInputStream;importjava.io.IOException;publicclassTest{publicstaticvoidmain(String[]args)throws IOException{FileInputStream fis=newFileInputStream("data1.txt");//ANSI格式for(int i=0;i<5;i++){System.out.println(fis.read());}fis.close();System.out.println("...
首先我们来看这个没有参数的read方法,从(来源)输入流中(读取的内容)读取数据的下一个字节到(去处)java程序内部中,返回值为0到255的int类型的值,返回值为字符的ACSII值(如a就返回97,n就返回110).如果没有可用的字节,因为已经到达流的末尾, -1返回的值,运行一次只读一个字节,所以经常与while((len = inputstre...
1 FileInputStream fis = new FileInputStream("致青春.mp3"); //创建输入流对象,关联致青春.mp3 2 FileOutputStream fos = new FileOutputStream("copy.mp3"); //创建输出流对象,关联copy.mp3 3 4 int b; 5 while((b = fis.read()) != -1) { //将每次读到的赋值给b ...
read(byte[] b, int off, int len)：一次最多读取 len 个字节，但实际读取的字节数可能少于 len ...
Besides using the Scanner class, we can also use an InputStreamReader with System.in to get the input from the console: BufferedReader buffReader = new BufferedReader(new InputStreamReader(System.in)); And then we can read input and parse it to an integer: int i = Integer.parse...
[Android.Runtime.Register("read", "()I", "GetReadHandler")] public override int Read(); 返回 Int32 下一个字节的数据,或者 -1 到达文件的末尾。 属性 RegisterAttribute 例外 IOException 注解 从此输入流读取数据字节。 如果尚未提供任何输入,此方法将阻止。 适用于 . 的 java.io.FileInputStream...
1. Read string from console input In this example, we shall define aScannerwith the input stream,System.in. System.increates a standard input stream which is already open and ready to supply input data. Scanneris simple text scanner which can parse primitive types and strings using regular ex...