Think in java Stream 经典

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

import java.io.*;

public class NewIODemo {

public static void main(String[] args) {

try {

// 1. Reading input by lines:

BufferedReader in =

new BufferedReader(

new FileReader(args[0]));

String s, s2 = new String();

while((s = in.readLine())!= null)

s2 += s + "\n";

in.close();

// 1b. Reading standard input:

BufferedReader stdin =

new BufferedReader(

new InputStreamReader(System.in));

System.out.print("Enter a line:");

System.out.println(stdin.readLine());

// 2. Input from memory

StringReader in2 = new StringReader(s2);

int c;

while((c = in2.read()) != -1)

System.out.print((char)c);

// 3. Formatted memory input

try {

DataInputStream in3 =

new DataInputStream(

// Oops: must use deprecated class:

new StringBufferInputStream(s2));

while(true)

System.out.print((char)in3.readByte());

} catch(EOFException e) {

System.out.println("End of stream");

}

// 4. Line numbering & file output

try {

LineNumberReader li =

new LineNumberReader(

new StringReader(s2));

BufferedReader in4 =

new BufferedReader(li);

PrintWriter out1 =

new PrintWriter(

new BufferedWriter(

new FileWriter("IODemo.out")));

while((s = in4.readLine()) != null )

out1.println(

"Line " + li.getLineNumber() + s);

out1.close();

} catch(EOFException e) {

System.out.println("End of stream");

}

// 5. Storing & recovering data

try {

DataOutputStream out2 =

new DataOutputStream(

new BufferedOutputStream(

new FileOutputStream("Data.txt")));

out2.writeDouble(3.14159);

out2.writeBytes("That was pi");

out2.close();

DataInputStream in5 =

new DataInputStream(

new BufferedInputStream(

new FileInputStream("Data.txt")));

BufferedReader in5br =

new BufferedReader(

new InputStreamReader(in5));

// Must use DataInputStream for data:

System.out.println(in5.readDouble());

// Can now use the "proper" readLine():

System.out.println(in5br.readLine());

} catch(EOFException e) {

System.out.println("End of stream");

}

// 6. Reading and writing random access

// files is the same as before.

// (not repeated here)

} catch(FileNotFoundException e) {

System.out.println(

"File Not Found:" + args[1]);

} catch(IOException e) {

System.out.println("IO Exception");

}

}

} ///:~

 
 
 
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