Doing a bit of research, it seems like the problem may be my MyWorld class, so I'm going to link that here.
I also have a sneaking suspicion that it may be because of either me trying to create a new file within the project or me asking the user to enter in parameters before starting the world.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)import java.io.*;import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; /** * The world will be a square with aliens coming from the top and the spaceship * residing at the bottom. The world keeps track of lives(as soon as it reaches * 0, the trial ends and all values reset) * * Credits: https://www.w3schools.com/java/java_files_create.asp(writing to files), https://www.greenfoot.org/topics/58693/0(user input), * https://stackabuse.com/how-to-get-current-date-and-time-in-java/(keeping track of date) */public class MyWorld extends World{ private int numTrials = SimulationParameters.numTrials; private int timeBetweenSpawn = 50; private int currentTimer = 0; private int numPeriods = 0; private final String filename= String.format("/simulation-results/%s", getFileTag()); //I'm not sure how to check for file exceptions as I cannot use a try/catch block when declaring a member variable private File currentSimulationFile = new File(filename); private String getFileTag(){ /*Get filetag in format of ddMMyyhhmmss*/ LocalDateTime datetime = LocalDateTime.now(); DateTimeFormatter formatterDateTime = DateTimeFormatter.ofPattern("ddMMyyyyHHmmss"); return datetime.format(formatterDateTime); } private void buffAliens(){ /*buffs the aliens by reducing spawn time and increasing speed by a certain percentage*/ timeBetweenSpawn *= .8; Alien.alienSpeed *= 1.2; } private void startInvasion(){ /*Peridoically summons aliens. After a certain amount of periods, the summoning time of aliens will decrease and their speed will increase*/ currentTimer -= 1; if(currentTimer <= 0){ numPeriods += 1; if(numPeriods > 6){ numPeriods = 0; buffAliens(); } Alien alien = new Alien(); addObject(alien, 50 + Greenfoot.getRandomNumber(getWidth() - 100),0); currentTimer = timeBetweenSpawn; } } private void placeSpaceship(){ /*Places the spaceship at a random position at the bottom of the screen*/ Spaceship spaceship = new Spaceship(); addObject(spaceship, 50 + Greenfoot.getRandomNumber(getWidth() - 100),450); } private void displayInfo(){ /*Display # of lives and current score*/ showText("Score: " + String.valueOf(Alien.currentScore), 50, 50); showText("Lives: " + String.valueOf(Alien.lives), 50, 70); } private void resetAllStats(){ /*Remove all aliens and reset all parameters*/ Alien.lives = SimulationParameters.lives; for(Alien a: getObjects(Alien.class)){ this.removeObject(a); } numPeriods = 0; currentTimer = 0; timeBetweenSpawn = SimulationParameters.timeBetweenSpawn; Alien.alienSpeed = SimulationParameters.alienSpeed; } private void writeScore(){ /*Will write the current score to the file*/ try{ FileWriter writer = new FileWriter(filename); int trialNum = SimulationParameters.numTrials - numTrials; writer.write(String.format("Trial %s: %s",String.valueOf(trialNum),String.valueOf(Alien.currentScore))); } catch(IOException e){ System.out.println("An error occurred."); e.printStackTrace(); } Alien.currentScore = 0; } private void stopSimulation(){ /*Stops the program*/ Greenfoot.stop(); } private void checkForDeath(){ /*If the ship dies and we aren't finished with the simulation, then reset the board and varstates for the next invasion. Write the current score to a textfile. If this is the last trial, close the file*/ if(Alien.lives == 0){ numTrials--; writeScore(); if(numTrials > 0){ resetAllStats(); } else{ stopSimulation(); } } } public void act(){ startInvasion(); displayInfo(); checkForDeath(); } public MyWorld() { /*Create world dimensions,place spaceship, get Simulation Parameters, and start alien invasion.*/ super(500, 500, 1); SimulationParameters.numTrials = Integer.parseInt(Greenfoot.ask("Enter # of trials: ")); Alien.lives = Integer.parseInt(Greenfoot.ask("Enter # of lives(1-50 is recommended): ")); Spaceship.bulletReload = Integer.parseInt(Greenfoot.ask("Enter bullet reload time(2-20 is recommended): ")); SimulationParameters.timeBetweenSpawn = Integer.parseInt(Greenfoot.ask("Enter initial alien spawning time(30-150 is recommended): ")); Alien.alienSpeed = Integer.parseInt(Greenfoot.ask("Enter intial alien speed(1-10 is recommended): ")); Alien.worldHeight = getHeight(); placeSpaceship(); }} |
