IO - Revision history

Suhridk: /* PrintWriter */

2011-09-10T10:50:11Z

PrintWriter

2011-09-10T10:45:40Z

FileReader

2011-09-10T10:45:04Z

FileWriter

2011-09-10T10:32:55Z

PrintWriter

2011-09-10T10:29:35Z

BufferedReader

2011-09-10T10:12:41Z

FileReader

2011-09-10T09:54:28Z

FileWriter

2011-09-10T09:46:47Z

FileWriter

2011-09-05T18:15:36Z

File Class

2011-09-05T18:11:59Z

Reader Classes

@@ Line 69: / Line 69: @@
 * PrintWriter offers convenience methods and constructors.
 * PrintWriter can write directly to a File, without needing to wrap a FileWriter.
 * It has the following overloaded methods:

@@ Line 84: / Line 84: @@
 * Used to read character files.
 * Constructors take a File/FileName and '''throw a FileNotFoundException''' if file not found or is a directory or cannot be opened for some reason.
 * Has a basic read(char[] cbuf) method.

@@ Line 20: / Line 20: @@
 * Writes characters to a File.
 * FileWriter constructor takes a File/Filename, and a boolean flag to indicate whether the file should be opened in append mode.
 * By default append is false, which means the filewriter will overwrite existing file contents. If append is true, write() methods will append characters to the existing content.

@@ Line 70: / Line 70: @@
 * PrintWriter can write directly to a File, without needing to wrap a FileWriter.
 * It has the following overloaded methods:
 ** write() - inherited from java.io.Writer
 ** append() - from java.io.Appendable

← Older revision		Revision as of 10:29, 10 September 2011
Line 89:		Line 89:

	* Buffers input for performance		* Buffers input for performance
		+	* Overloaded constructors take a java.io.Reader and an optional buffer size.
		+	* All the read() methods throw an IOException.
	* Has the convenient readLine() method.		* Has the convenient readLine() method.

@@ Line 81: / Line 81: @@
 === FileReader ===
 * Has a basic read(char[] cbuf) method.
 * Not convenient since char[] array size has to be big enough.

@@ Line 26: / Line 26: @@
 * Has overloaded newer append() methods (behaves exactly like write) that take CharSequence.
 ** append(CharSeq), append(CharSequence cs, int start, int end)
 === BufferedWriter ===

@@ Line 120: / Line 120: @@
 == File Class ==
-* A File object can represent a file or a directory.
+* A File object can represent a '''file or a directory.'''
 * File f = new File("a.txt") just creates an object representing the file, doesnt create the file on the disk.
 * createNewFile() - will attempt to create a file. Returns true/false depending on the success status.
@@ Line 126: / Line 126: @@
 * mkdir() - will create a directory.
 * list() - returns a String[] of directory contents if the File represents a dir, else it will return null.
 * Deleting is done for both files and directories using the delete() method.

← Older revision		Revision as of 18:11, 5 September 2011
Line 74:		Line 74:

	== Reader Classes ==		== Reader Classes ==
		+
		+	=== FileReader ===
		+
		+	* Has a basic read(char[] cbuf) method.
		+	* Not convenient since char[] array size has to be big enough.
		+
		+	=== BufferedReader ===
		+
		+	* Buffers input for performance
		+	* Has the convenient readLine() method.
		+
		+	<syntaxhighlight lang="java5">
		+
		+
		+	import java.io.*;
		+
		+	public class IPOP2 {
		+
		+	public static void main(String[] args) {
		+
		+	File li = new File("/tmp/loremipsum.out");
		+
		+	try {
		+
		+	FileReader fr = new FileReader(li);
		+
		+	BufferedReader br = new BufferedReader(fr);
		+
		+	String str;
		+
		+	while((str = br.readLine()) != null) {
		+	System.out.println(str);
		+	}
		+
		+	} catch (IOException ioe) {
		+	ioe.printStackTrace();
		+	}
		+
		+	}
		+	}
		+
		+
		+	</syntaxhighlight>

	== File Class ==		== File Class ==