java.java

/*

Specify the path of your input file in PATH variable

*/



import java.io.*;
import java.util.Scanner;
import java.util.StringTokenizer;
class MainFile{
	final static int LENGTH = 80;
	final static char EMPTY = '_';
	final static String PATH = "C:\\temp\\hw.txt";
	public static void main(String[] args){
		try{
			char ch;
			String out = "";
			FileInputStream fstream = new FileInputStream(PATH);
			// Get the object of DataInputStream
			DataInputStream in = new DataInputStream(fstream);
			Scanner in2 = new Scanner(System.in);
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
			String strLine;
			while ((strLine = br.readLine()) != null){
			  // Print the content on the console
			  System.out.println(strLine);
			  System.out.print("Enter alignment(l,r,c,j): ");
			  ch = in2.next().charAt(0);
			  ch = Character.toLowerCase(ch);
			  System.out.println(ch);
			  
			  switch(ch){
			  case 'l':
				  out = strLeft(strLine);
				  break;
			  case 'r':
				  out = strRight(strLine);
				  break;
			  case 'c':
				  out = strCenter(strLine);
				  break;
			  case 'j':
				  out = strJustify(strLine);
				  break;
			  default: break;
			  }
			  System.out.println(out);
			}
			in.close();
			in2.close();
		}
		catch(Exception e){
			System.err.println("Error: " + e.getMessage());
		}
	}

	private static String strJustify(String strLine) {
		// TODO Auto-generated method stub
		StringTokenizer st = new StringTokenizer(strLine);
		if(st.countTokens()==1){
			return strLeft(strLine);
		}
		String[] tok = new String[st.countTokens()];
		int i=0,tot=0;
		while(st.hasMoreElements()){
			tok[i++] = st.nextToken();
			tot+=tok[i-1].length();
		}
		String out = "";
		System.out.println(tok.length);
		int t = (LENGTH-tot)/(tok.length-1);
		for(int j=0;j<tok.length;j++){
			if(j==tok.length-1){
				out+=tok[j];
				return out;
			}
			out = out+tok[j];
			for(int k=0;k<t;k++)
				out+=EMPTY;
		}
		return out;
	}

	private static String strCenter(String strLine) {
		// TODO Auto-generated method stub
		String out = "";
		int l = strLine.length();
		int i;
		if(l<=LENGTH){
			int m = (LENGTH-l)/2;
			//System.out.println(l);
			for(i=0;i<m;i++){
				//System.out.print(i);
				out = out+EMPTY;
			}
			out = out+strLine;
			for(i=i+l;i<LENGTH;i++){
				out = out+EMPTY;
			}
		}
		return out;
	}

	private static String strRight(String strLine) {
		// TODO Auto-generated method stub
		String out = "";
		int l = strLine.length();
		int i;
		if(l<=LENGTH){
			//System.out.println(l);
			for(i=0;i<LENGTH-l;i++){
				//System.out.print(i);
				out = out+EMPTY;
			}
			out = out+strLine;
		}
		return out;
	}

	private static String strLeft(String strLine) {
		// TODO Auto-generated method stub
		String out = "";
		int l = strLine.length();
		int i;
		if(l<=LENGTH){
			//System.out.println(l);
			out = out+strLine;
			for(i=0;i<LENGTH-l;i++){
				//System.out.print(i);
				out = out+EMPTY;
			}
		}
		return out;
	}
}