查阅JDK API可以发现,System类中的静态属性in是InputStream类型的对象,可以按照输入流的读取方法读取即可。 下面的示例代码实现了输入“回显”的功能,即将用户输入的内容重新显示到控制台,示例代码如下: /** *读取控制台输入,并将输入的内容显示到控制台 */ public class ReadConsole1 { public static void main(Str...
importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;importjava.util.Scanner;publicclassInout {publicstaticvoidmain(String[] args) { charTest();//调用System.in方法readTest();//调用ReadTest方法scannerTest();//调用ScannerTest方法}/*** System.in和System.out方法 * ...
In this tutorial, we will learn how to prompt user to input a string and then read the string from console input. Examples 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...
BufferedReaderis supported since Java 1.1. We may see its usage in legacy Java applications. To read console input, we shall wrap theSystem.in(standard input stream) in anInputStreamReaderwhich again wrapped in aBufferedReaderclass. BufferedReaderreads text from the console, buffering characters so...
InputStreamReader cin = new InputStreamReader(System.in) Console(控制台),提供了比标准流更多的功能。重要的是,Console可以有效地保护密码的输入,同时Console对象可以使用各种read()和write()方法来操纵字符流的输入输出。在程序使用Console对象之前,需要先调用System.console()方法来获得Console对象。Console对象使用re...
下面的例子程序演示了read()方法,从控制台读取字符直到用户键入“q”: import java.io.*; class BRRead { public static void main(String args[]) throws IOException { char c; BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); ...
以java.io.Reader 对象的形式获取此 ResultSet 对象的当前行中指定列的值。 Reader SQLInput.readCharacterStream() 读取流中的下一个属性并将其作为 Unicode 字符流返回。参数类型为 Reader 的java.sql 中的方法 void PreparedStatement.setCharacterStream(int parameterIndex, Reader reader) 将指定参数设置为给定...
The console-read methods returnnullwhen the end of the console input stream is reached, for example by typing control-D on Unix or control-Z on Windows. Subsequent read operations will succeed if additional characters are later entered on the console's input device. ...
Java read text files tutorial shows how to read text files in Java. We use build-in tools including FileReader, InputStreamReader, and Scanner.
通常InputStream的read()返回-1后,说明到达文件尾,不能再读取。除非使用了mark/reset。 2.FileOutputStream 循序渐进版, InputStream是所有字节输出流的父类,子类有ByteArrayOutputStream,FileOutputStream,ObjectOutputStreanm,这些我们在后面都会一一说到。先说FileOutputStream ...