Thread: Using scanner and if/else statement to draw one of two graphics.

Hey there, I have a homework problem for us to solve. I have to make a program for my introductory programming course that displays either one picture (a "wild face") or another (a "happy face") when the user inputs their response to the question("Are you feeling happy or wild?"). The problem is that I don't know how to make the if/else statement display the appropriate graphics on screen. Here's my code so far:

 
import javax.swing.JApplet;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Scanner;
 
public class HappyWild{
 
	public void init() {
		setSize(1000,1000);
	}
 
	public void wildFace (Graphics canvas)
	{
		//Draw outline
		canvas.setColor(new Color(237,207,159));
		canvas.fillOval(100, 50, 200, 200);
		canvas.setColor(Color.BLACK);
		canvas.drawOval (100, 50, 200, 200);
 
		//Draw eyebrows
		canvas.fillRoundRect(150, 80, 40, 10, 8, 16);
		canvas.fillRoundRect(215, 80, 40, 10, 8, 16);
 
		//Draw mustache
		canvas.drawLine (190, 184, 150, 195);
		canvas.drawLine (210, 184, 250, 195);
 
		//Draw lips
		canvas.drawArc (163, 190, 32, 20, 360, 180);
		canvas.drawArc (195, 190, 32, 20, 360, 180);
 
		//Draw eyelids
		canvas.setColor(Color.BLACK);
		canvas.drawArc (150, 95, 40, 20, 360, 180);
		canvas.drawArc (215, 95, 40, 20, 360, 180);
 
		//Draw nose
		canvas.drawLine (200, 125, 200, 165);
		canvas.drawArc (192, 175, 16, 4, 180, 180);
		canvas.drawArc (208, 170, 8, 4, 90, 180);
		canvas.drawArc (184, 170, 8, 4, 99, -180);
 
		//Draw mouth
		canvas.drawLine (163, 200, 228, 200);
 
		//Draw eyes
		canvas.setColor(Color.WHITE);
		canvas.fillOval (155, 100, 25, 20);
		canvas.fillOval (220, 100, 25, 20);
		canvas.setColor(Color.BLACK);
		canvas.drawOval (155, 100, 25, 20);
		canvas.drawOval (220, 100, 25, 20);
 
		//Draw irises
		canvas.setColor(new Color(158,104,17));
		canvas.fillOval (163, 107, 10, 10);
		canvas.fillOval (228, 107, 10, 10);
 
		//Draw pupils
		canvas.setColor(Color.BLACK);
		canvas.fillOval (165, 109, 6, 6);
		canvas.fillOval (230, 109, 6, 6);
 
		//Draw eye shine
		canvas.setColor(Color.WHITE);
		canvas.fillOval (168, 109, 2, 2);
		canvas.fillOval (233, 109, 2, 2);
 
	}
 
	public void happyFace (Graphics canvas)
	{
		// Draw outline
        canvas.drawOval (100, 50, 200, 200);
 
        // Draw eyes
        canvas.fillOval (155, 100, 10, 20);
        canvas.fillOval (230, 100, 10, 20);
 
        // Draw mouth
        canvas.drawArc (150, 160, 100, 50, 180, 180);
	}
 
	public static void main(String[] args) {
		System.out.println("Are you feeling happy or wild?");
		System.out.println("Type in either 'happy' or 'wild'.");
		Scanner keyboard = new Scanner(System.in);
		String answer = keyboard.next();
		System.out.println("You entered: \"" + answer + "\"");
		if (answer.equalsIgnoreCase("happy"))
			happyFace (Graphics canvas);
		else if (answer.equalsIgnoreCase("wild")) 
			wildFace (Graphics canvas);
		else 
			System.out.println("incorrect input.");
 
	}
}

Eclipse keeps telling me to delete the token "canvas" and that Graphics cannot be resolved to a variable, whatever those two statements mean. Thanks for your time and any help. I need the graphics to pop up in a Java applet, but I don't know how to do that. I think I'm supposed to use "such-and-such class extends JApplet", but I'm only using one class (HappyWild) in the program. How would I make Java applets pop up with the correct graphics?

you're passing a Graphics object as a parameter in your definition but you didn't follow the rules of that syntax in your main method... its says to you need to delete something in your face methods in the main basically

You will want to read a tutorial on how to create a GUI with Java to gain some insights because you can't guess at this stuff. First though before you do anything else, you have to decide if you want to create a JApplet or a JFrame. Then check out the appropriate tutorial on how to construct this GUI because their structures are very different. Then you'll want to read up on how to draw with Swing applications. Usually this is done by overriding the paintComponent method of a JPanel or similar class and using the Graphics object passed into this method. For the details I again refer you to the tutorials which Google can help you find. Much luck!

--- Update ---

Edit: it appears that you are supposed to create a JApplet, and so yes, your class must extend JApplet, and you should not have a main method since applets don't use main methods (at least none directly created by us). Again, please read the tutorials as they will explain much that will help you. Also, don't use a Scanner or System.out.println statements (except perhaps to debug). This is a JApplet GUI and should be a GUI-only program.

Thank you gentlemen, I appreciate your brilliance and time. I finished it and the code is here:

import javax.swing.JApplet;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Scanner;
 
public class HappyWild extends JApplet {
 
	public void init() {
		setSize(500,500);
	}
 
	public void paint (Graphics canvas) {
		System.out.println("Are you feeling happy or wild?");
		System.out.println("Type in either 'happy' or 'wild'.");
		Scanner keyboard = new Scanner(System.in);
		String answer = keyboard.nextLine();
		System.out.println("You entered: \"" + answer + "\"");
		if (answer.equalsIgnoreCase("wild"))
		{
			//Draw outline
			canvas.setColor(new Color(237,207,159));
			canvas.fillOval(100, 50, 200, 200);
			canvas.setColor(Color.BLACK);
			canvas.drawOval (100, 50, 200, 200);
 
			//Draw eyebrows
			canvas.fillRoundRect(150, 80, 40, 10, 8, 16);
			canvas.fillRoundRect(215, 80, 40, 10, 8, 16);
 
			//Draw mustache
			canvas.drawLine (190, 184, 150, 195);
			canvas.drawLine (210, 184, 250, 195);
 
			//Draw lips
			canvas.drawArc (163, 190, 32, 20, 360, 180);
			canvas.drawArc (195, 190, 32, 20, 360, 180);
 
			//Draw eyelids
			canvas.setColor(Color.BLACK);
			canvas.drawArc (150, 95, 40, 20, 360, 180);
			canvas.drawArc (215, 95, 40, 20, 360, 180);
 
			//Draw nose
			canvas.drawLine (200, 125, 200, 165);
			canvas.drawArc (192, 175, 16, 4, 180, 180);
			canvas.drawArc (208, 170, 8, 4, 90, 180);
			canvas.drawArc (184, 170, 8, 4, 99, -180);
 
			//Draw mouth
			canvas.drawLine (163, 200, 228, 200);
 
			//Draw eyes
			canvas.setColor(Color.WHITE);
			canvas.fillOval (155, 100, 25, 20);
			canvas.fillOval (220, 100, 25, 20);
			canvas.setColor(Color.BLACK);
			canvas.drawOval (155, 100, 25, 20);
			canvas.drawOval (220, 100, 25, 20);
 
			//Draw irises
			canvas.setColor(new Color(158,104,17));
			canvas.fillOval (163, 107, 10, 10);
			canvas.fillOval (228, 107, 10, 10);
 
			//Draw pupils
			canvas.setColor(Color.BLACK);
			canvas.fillOval (165, 109, 6, 6);
			canvas.fillOval (230, 109, 6, 6);
 
			//Draw eye shine
			canvas.setColor(Color.WHITE);
			canvas.fillOval (168, 109, 2, 2);
			canvas.fillOval (233, 109, 2, 2);
 
		}
		else if (answer.equalsIgnoreCase("happy")) 
		{
			// Draw outline
	        canvas.drawOval (100, 50, 200, 200);
 
	        // Draw eyes
	        canvas.fillOval (155, 100, 10, 20);
	        canvas.fillOval (230, 100, 10, 20);
 
	        // Draw mouth
	        canvas.drawArc (150, 160, 100, 50, 180, 180);
		}
		else 
			System.out.println("incorrect input.");
 
	}
}