Sample code for input and output streams of JAVA language
This article mainly introduces the JAVA language input and output stream sample code, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.
Public class IOStreamDemo {
Public void samples () throws IOException {
/ / 1. This is reading a line of data from the keyboard and returning a string.
BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in))
System.out.print ("Enter a line:")
System.out.println (stdin.readLine ())
/ / 2. This is to read the data line by line from the file
BufferedReader in = new BufferedReader (new FileReader ("IOStreamDemo.java"))
String s, S2 = new String ()
While ((s = in.readLine ())! = null)
S2 + = s + ""
In.close ()
/ / 3. This is to read bytes one by one from a string
StringReader in1 = new StringReader (S2)
Int c
While ((c = in1.read ())! =-1)
System.out.print ((char) c)
/ / 4. This is to write a string to the file
Try {
BufferedReader in2 = new BufferedReader (new StringReader (S2))
PrintWriter out1 = new PrintWriter (new BufferedWriter (new FileWriter ("IODemo.out")
Int lineCount = 1
While ((s = in2.readLine ())! = null)
Out1.println (lineCount++ + ":" + s)
Out1.close ()
} catch (EOFException e) {
System.err.println ("End of stream")
}
}
}
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