import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;


public class Equals {

	private String s1;
	private String s2;

	Equals (String s1, String s2){
		this.s1 = s1;
		this.s2 = s2;
	}

	public void testEqualsEquals (String a, String b) {
		System.out.println("Testing '" +a + "' == '" + b + "' is " +
				(a == b));
	}

	public void testDotEquals (String a, String b) {
		System.out.println("Testing '" +a + "' .equals() '" + b + "' is " +
				(a.equals(b)));
	}

	public void testTwo(String msg, String a, String b) {
		System.out.println("Testing: " + msg);
		testEqualsEquals(a, b);
		testDotEquals(a, b);
		System.out.println();
	}


	public void testEquals(){

		int Five1 = 5;
		int Five2 = 4+1;
		double doubleFive = 5.0;
		
		// primitives
		
		if (Five1==Five2)
			System.out.println("primitive comparison: " + Five1 +  "==" + Five2 +"\n");
		else
			System.out.println("primitive comparison: " + Five1 +  "!=" + Five2 +"\n");
		

        // surprised?		
		if (Five1==doubleFive)
			System.out.println("primitive comparison: " + Five1 +  "==" + doubleFive +"\n");
		else
			System.out.println("primitive comparison: " + Five1 +  "!=" + doubleFive +"\n");


		testTwo("Strings from command line parameters" , s1, s2);
		String h = "hello ";
		String w = "world"; 
		String hw1 = "hello world";
		String hw2 = h+w;

		testTwo("String literal concatenation", hw1, hw2);

		// Look at different result here, java has only one copy of literals
		String s3 = "string";
		String s4 = "string";
		testTwo("two identical String literals", s3, s4);

	}
	/**
	 * @param args: two Strings
	 * @throws FileNotFoundException 
	 */
	public static void main(String[] args) throws FileNotFoundException {
		// intermezzo:  where does your input file go inEclipse?
		/*
		Scanner scan = new Scanner(new File("wrongPlace"));
		
		//Scanner scan = new Scanner(new File("inEq"));
		int v;
		for (int i = 0; i<4; i++){
			v = scan.nextInt();
			System.out.println("v: " +v);
		}
        */

		// goal of this code:  == vs .equals
		Equals E = new Equals (args[0], args[1]);
		E.testEquals();
	}

}