JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Write a program to find two lines with max characters in descending order.


Description:

Write a program to read a multiple line text file and write the 'N' longest lines to the output console, where the file to be read is specified as command line aruguments. The program should read an input file. The first line should contain the value of the number 'N' followed by multiple lines. 'N' should be a valid positive integer.


Code:
package com.longest.lines;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;

public class Main {

	public static void main(String[] args) {
		
		BufferedReader br = null;
		String filePath = args[0];
		int topList = 0;
		Set<Entries> liSet = new TreeSet<Entries>(new MyComp());
		try {
			br = new BufferedReader(new FileReader(new File(filePath)));
			String line = br.readLine();
			topList = Integer.parseInt(line.trim());
			while((line = br.readLine()) != null){
				line = line.trim();
				if(!"".equals(line)){
					liSet.add(new Entries(line.length(), line));
				}
			}
			int count = 0;
			for(Entries ent:liSet){
				System.out.println(ent.line);
				if(++count == topList){
					break;
				}
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static class Entries{
		Integer length;
		String line;
		public Entries(Integer l,String line){
			length = l;
			this.line = line;
		}
	}
	
	public static class MyComp implements Comparator<Entries>{

		@Override
		public int compare(Entries e1, Entries e2) {
			if(e2.length > e1.length){
				return 1;
			} else {
				return -1;
			}
		}
		
	}
}

Sample input file:
3
Java2novice
My Test line 123

Java world
I know java language

This is a test program
java is simple

Output:
This is a test program
I know java language
My Test line 123
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Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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