JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to convert inputstream to reader or BufferedReader?


Sometimes we need to convert inputstream object to reader object, so that we can handle the stream according to our logic. Below example shows how to convert inputstream to bufferedreader object.


package com.java2novice.files;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class MyIstoBr {

	public static void main(String a[]){
		
		InputStream is = null;
		BufferedReader bfReader = null;
		try {
			is = new FileInputStream("C:/sample.txt");
			bfReader = new BufferedReader(new InputStreamReader(is));
			String temp = null;
			while((temp = bfReader.readLine()) != null){
				System.out.println(temp);
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
This is a test file, here we are
trying to read a file using BufferedReader.
We are trying to convert input stream object 
to reader object.
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Knowledge Centre
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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