CSC212 Class demo with Eclipse

--D. Thiebaut (talk) 14:50, 7 October 2014 (EDT)

---

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Stack;

public class Demo1 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ArrayList lines = readInput();
		//System.out.println( lines );
		
		Stack stack = new Stack();
		ArrayList newLines = process(lines, stack);
		//System.out.println( "stack = " + stack );
		//System.out.println( "newLines = " + newLines );
		
		replacePrintout( newLines, stack );
	}

	private static void replacePrintout(ArrayList newLines, Stack stack) {
		for ( int i=0; i< newLines.size(); i++ ) {
			String line = (String) newLines.get(i);
			Scanner scan = new Scanner( line );
			while ( scan.hasNext() ) {
				String word = scan.next();
				if ( word.equals( "#" ) )
					System.out.print( stack.pop()+ " " );
				else
					System.out.print( word + " " );
			}
			System.out.println();
		}
		
	}

	private static ArrayList process(ArrayList lines, Stack stack) {
		ArrayList newLines = new ArrayList();
		for (int i = 0; i < lines.size(); i++) {
			String line = (String) lines.get(i);
			Scanner scan = new Scanner(line);
			String newLine = "";
			while (scan.hasNext()) {
				String word = scan.next();
				if (isNumber(word)) {
					int num = Integer.parseInt(word);
					stack.push(num);
					word = "#";
				}
				newLine = newLine + " " + word;
			}
			newLines.add( newLine );
		}
		return newLines;
	}

	private static boolean isNumber(String word) {
		try {
			Integer.parseInt(word);
			return true;
		} catch (NumberFormatException e) {
			return false;
		}
	}

	private static ArrayList readInput() {
		ArrayList list = new ArrayList();
		list.add("alpha 5 6");
		list.add("beta 10 gamma");
		list.add("delta 50");
		return list;
	}

}