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POCalling different classes with if else statements
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  1. POCalling different classes with if else statements
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    copied!<p>I'm writing a java program that is like a physics lesson:</p> <pre><code>import javax.swing.JOptionPane; public class PhysicsClass { public static void main(String[] args) { int g = -1; while (g&lt;0){ String input = JOptionPane.showInputDialog("Welcome! What's your name? "); if(input.length() &gt; 0){ g++; System.out.println("Great! Lets begin."); } else{ System.out.println(" ok then."); System.exit(0); } } String[] firstChoice = {"Kinematics", "Dynamics", "Impulse/Momentum", "Energy/Power"}; JOptionPane.showInputDialog(null, "Which one of these Topic would you like to start with?", "Please pick a topic to start with", JOptionPane.INFORMATION_MESSAGE, null, firstChoice, firstChoice[0]); int i = 0; while (i&lt;0){ String Choice = ""; if (Choice == firstChoice[0]){ Kinematics.IntroToKinematics(); i++; } else if (Choice == firstChoice[1]){ Dynamics.DynamicsIntro(); i++; } else if (Choice == firstChoice[2]){ ImpulseAndMomentum.ImpulseAndMomentumIntro(); i++; } else if (Choice == firstChoice[3]){ EnergyAndPower.EnergyAndPowerIntro(); i++; } else{ System.out.println("Please pick one."); } } </code></pre> <p>I want whatever choice you pick in the first choice array to then go to the respected class. So if I choose kinematics, it will call on the kinematics class, for which the first few lines are:</p> <pre><code>import javax.swing.JOptionPane; public class Kinematics { public static void IntroToKinematics() { JOptionPane.showInternalMessageDialog(null, "Kinematics is one of the most basic" + " ideas of Newtonian Physics. It encompasses: speed, distance, time" + " displacement, acceleration and many key base concepts that form the the " + " foundation for most physic subjects. It will poke its head in everything" + "we cover.", "intro", JOptionPane.INFORMATION_MESSAGE); } } </code></pre> <p>It doesn't give me any errors but when I choose one of the strings from the array, it doesn't do anything. I think it might have something to do with the if else statements I used. Thanks for any and all help, I'm still relatively new to Java so any tips would be appreciated. </p>
 

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