@matfah/

Student Record FR 2005

Java

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  • Main.java
  • StudentRecord.java

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Error: Error: must not create an existing file {"type":"CREATE_FILE","wid":"0.921323549772159","path":"Main.java","file":{"path":"Main.java","content":{"asEncoding":{"base64":"import java.lang.reflect.*;
import java.util.ArrayList;

public class Main {
  
  
  public static void main(String[] args) {
    testAverage();
    System.out.println("average() method works!");
    testHasImproved();
    System.out.println("hasImproved() method works!");
    testFinalAverage();
    System.out.println("finalAverage() method works!!");
    
    System.out.println("All tests passed!");
  }
  
  public static void testAverage() {
    
    StudentRecord rec = new StudentRecord();
    
    Field scoresField = null;
    try {
      scoresField = StudentRecord.class.getDeclaredField("scores");
    }
    catch(Exception e) {
      System.out.println("Did you remove the scores instance variable?!");
      System.exit(0);
    }
    scoresField.setAccessible(true);
    
    for(int i = 1; i <= 10; i++) {
      int[] scores = new int[i];
      
      for(int j = 0; j < i; j++)
        scores[j] = (int)(Math.random()*20) - 10;
        
      for(int first = 0; first < i; first++) {
        for(int last = first; last < i; last++) {
          
          try {
            scoresField.set(rec, scores.clone());
          }
          catch(Exception e) {
            System.out.println("The scores instance variable is not an int[]...?");
            System.exit(0);
          }
          

          double result = 0.0;
          double copyResult = 0.0;
      
          try {
            copyResult = result = rec.average(first, last);
          }
          catch(Exception e) {
            System.out.println("The average() method crashes when called!");
            System.out.println(" scores: " + java.util.Arrays.toString(scores));
            System.out.println(" first: " + first);
            System.out.println(" last: " + last);
            System.exit(0);
          }
    
          result *= (last - first + 1);
          for(int k = first; k <= last; k++)
            result-= scores[k];
            
          if(Math.abs(result) >= 0.0001) {
            System.out.println("Result of average() is not correct");
            System.out.println(" scores: " + java.util.Arrays.toString(scores));
            System.out.println(" first: " + first);
            System.out.println(" last: " + last);
            System.out.println(" result: " + copyResult);
            System.exit(0);
          }
          
        }
      }
    }
    
  }
  
  public static void testHasImproved() {
     StudentRecord rec = new StudentRecord();
    
    Field scoresField = null;
    try {
      scoresField = StudentRecord.class.getDeclaredField("scores");
    }
    catch(Exception e) {
      System.out.println("Did you remove the scores instance variable?!");
      System.exit(0);
    }
    scoresField.setAccessible(true);
    
    for(int i = 1; i <= 10; i++) {
      int[] scores = new int[i];
      
      boolean answer = true;
      for(int j = 0; j < i; j++) {
        scores[j] = (int)(Math.random()*3);
        answer = answer && (j == 0 || scores[j] >= scores[j-1]);
      }
      try {
        scoresField.set(rec, scores.clone());
      }
      catch(Exception e) {
        System.out.println("The scores instance variable is not an int[]...?");
        System.exit(0);
      }
      
      boolean result = false;
      try {
        result = rec.hasImproved();
      }
      catch(Exception e) {
        System.out.println("The hasImproved() method crashes when called!");
        System.out.println(" scores: " + java.util.Arrays.toString(scores));
        System.exit(0);
      }
      
      if(result != answer) {
        System.out.println("Result of hasImproved() is not correct");
        System.out.println(" scores: " + java.util.Arrays.toString(scores));
        System.out.println(" result: " + result);
        System.exit(0);
      }
      
    }
  }
  
  public static void testFinalAverage() {
    
    Field scoresField = null;
    try {
      scoresField = StudentRecord.class.getDeclaredField("scores");
    }
    catch(Exception e) {
      System.out.println("Did you remove the scores instance variable?!");
      System.exit(0);
    }
    scoresField.setAccessible(true);
    
    for(int i = 1; i <= 10; i++) {
      int[] scores = new int[i];
      
      boolean improved = true;
      for(int j = 0; j < i; j++) {
        scores[j] = (int)(Math.random()*3);
        improved = improved && (j == 0 || scores[j] >= scores[j-1]);
      }
        

      ZombieStudentRecord rec = new ZombieStudentRecord();
      
      try {
        scoresField.set(rec, scores.clone());
      }
      catch(Exception e) {
        System.out.println("The scores instance variable is not an int[]...?");
        System.exit(0);
      }
      

      double result = 0.0;
  
      try {
        result = rec.finalAverage();
      }
      catch(Exception e) {
        System.out.println("The finalAverage() method crashes when called!");
        System.exit(0);
      }

      if(rec.first.size()==0 || rec.last.size()==0 || rec.hasImproved == null) {
        System.out.println("Required methods not called in finalAverage()");
        System.exit(0);
      }
      
      int[] params;
      if(improved) {
        params = new int[]{scores.length/2, scores.length-1};
      }
      else {
        params = new int[]{0, scores.length-1};
      }
      
      boolean failed = true;
      for(int m = 0; m < rec.first.size(); m++) {
        if(rec.first.get(m) == params[0] && rec.last.get(m) == params[1]) {
          failed = false;
          break;
        }
      }
      
      if(failed) {
         System.out.println("Inside finalAverage(), call to average() with correct parameters is not made");
         System.exit(0);
      }
      
      double sum = 0.0;
      for(int n = params[0]; n <= params[1]; n++) {
        sum += scores[n];
      }
      sum /= (params[1] - params[0] + 1);
      
      if(Math.abs(sum - result) >= 0.0001) {
        System.out.println("Result of finalAverage() is not correct");
        System.out.println(" scores: " + java.util.Arrays.toString(scores));
        System.out.println(" result: " + result);
        System.exit(0);
      }
          
  
    }
  }
}

class ZombieStudentRecord extends StudentRecord {
  
  ArrayList<Integer> first = new ArrayList<Integer>();
  ArrayList<Integer> last = new ArrayList<Integer>();
  Boolean hasImproved = null;
  
  public double average(int first, int last) {
    this.first.add(first);
    this.last.add(last);
    return super.average(first, last);
  }
  
  public boolean hasImproved() {
    hasImproved = true;
    return super.hasImproved();
  }
}"},"asBuffer":null},"loaded":true}}
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import java.lang.reflect.*;
import java.util.ArrayList;

public class Main {
  
  
  public static void main(String[] args) {
    testAverage();
    System.out.println("average() method works!");
    testHasImproved();
    System.out.println("hasImproved() method works!");
    testFinalAverage();
    System.out.println("finalAverage() method works!!");
    
    System.out.println("All tests passed!");
  }
  
  public static void testAverage() {
    
    StudentRecord rec = new StudentRecord();
    
    Field scoresField = null;
    try {
      scoresField = StudentRecord.class.getDeclaredField("scores");
    }
    catch(Exception e) {
      System.out.println("Did you remove the scores instance variable?!");
      System.exit(0);
    }
    scoresField.setAccessible(true);
    
    for(int i = 1; i <= 10; i++) {
      int[] scores = new int[i];
      
      for(int j = 0; j < i; j++)
        scores[j] = (int)(Math.random()*20) - 10;
        
      for(int first = 0; first < i; first++) {
        for(int last = first; last < i; last++) {
          
          try {
            scoresField.set(rec, scores.clone());
          }
          catch(Exception e) {
            System.out.println("The scores instance variable is not an int[]...?");
            System.exit(0);
          }
          

          double result = 0.0;
          double copyResult = 0.0;
      
          try {
            copyResult = result = rec.average(first, last);
          }
          catch(Exception e) {
            System.out.println("The average() method crashes when called!");
            System.out.println(" scores: " + java.util.Arrays.toString(scores));
            System.out.println(" first: " + first);
            System.out.println(" last: " + last);
            System.exit(0);
          }
    
          result *= (last - first + 1);
          for(int k = first; k <= last; k++)
            result-= scores[k];
            
          if(Math.abs(result) >= 0.0001) {
            System.out.println("Result of average() is not correct");
            System.out.println(" scores: " + java.util.Arrays.toString(scores));
            System.out.println(" first: " + first);
            System.out.println(" last: " + last);
            System.out.println(" result: " + copyResult);
            System.exit(0);
          }
          
        }
      }
    }
    
  }
  
  public static void testHasImproved() {
     StudentRecord rec = new StudentRecord();
    
    Field scoresField = null;
    try {
      scoresField = StudentRecord.class.getDeclaredField("scores");
    }
    catch(Exception e) {
      System.out.println("Did you remove the scores instance variable?!");
      System.exit(0);
    }
    scoresField.setAccessible(true);
    
    for(int i = 1; i <= 10; i++) {
      int[] scores = new int[i];
      
      boolean answer = true;
      for(int j = 0; j < i; j++) {
        scores[j] = (int)(Math.random()*3);
        answer = answer && (j == 0 || scores[j] >= scores[j-1]);
      }
      try {
        scoresField.set(rec, scores.clone());
      }
      catch(Exception e) {
        System.out.println("The scores instance variable is not an int[]...?");
        System.exit(0);
      }
      
      boolean result = false;
      try {
        result = rec.hasImproved();
      }
      catch(Exception e) {
        System.out.println("The hasImproved() method crashes when called!");
        System.out.println(" scores: " + java.util.Arrays.toString(scores));
        System.exit(0);
      }
      
      if(result != answer) {
        System.out.println("Result of hasImproved() is not correct");
        System.out.println(" scores: " + java.util.Arrays.toString(scores));
        System.out.println(" result: " + result);
        System.exit(0);
      }
      
    }
  }
  
  public static void testFinalAverage() {
    
    Field scoresField = null;
    try {
      scoresField = StudentRecord.class.getDeclaredField("scores");
    }
    catch(Exception e) {
      System.out.println("Did you remove the scores instance variable?!");
      System.exit(0);
    }
    scoresField.setAccessible(true);
    
    for(int i = 1; i <= 10; i++) {
      int[] scores = new int[i];
      
      boolean improved = true;
      for(int j = 0; j < i; j++) {
        scores[j] = (int)(Math.random()*3);
        improved = improved && (j == 0 || scores[j] >= scores[j-1]);
      }
        

      ZombieStudentRecord rec = new ZombieStudentRecord();
      
      try {
        scoresField.set(rec, scores.clone());
      }
      catch(Exception e) {
        System.out.println("The scores instance variable is not an int[]...?");
        System.exit(0);
      }
      

      double result = 0.0;
  
      try {
        result = rec.finalAverage();
      }
      catch(Exception e) {
        System.out.println("The finalAverage() method crashes when called!");
        System.exit(0);
      }

      if(rec.first.size()==0 || rec.last.size()==0 || rec.hasImproved == null) {
        System.out.println("Required methods not called in finalAverage()");
        System.exit(0);
      }
      
      int[] params;
      if(improved) {
        params = new int[]{scores.length/2, scores.length-1};
      }
      else {
        params = new int[]{0, scores.length-1};
      }
      
      boolean failed = true;
      for(int m = 0; m < rec.first.size(); m++) {
        if(rec.first.get(m) == params[0] && rec.last.get(m) == params[1]) {
          failed = false;
          break;
        }
      }
      
      if(failed) {
         System.out.println("Inside finalAverage(), call to average() with correct parameters is not made");
         System.exit(0);
      }
      
      double sum = 0.0;
      for(int n = params[0]; n <= params[1]; n++) {
        sum += scores[n];
      }
      sum /= (params[1] - params[0] + 1);
      
      if(Math.abs(sum - result) >= 0.0001) {
        System.out.println("Result of finalAverage() is not correct");
        System.out.println(" scores: " + java.util.Arrays.toString(scores));
        System.out.println(" result: " + result);
        System.exit(0);
      }
          
  
    }
  }
}

class ZombieStudentRecord extends StudentRecord {
  
  ArrayList<Integer> first = new ArrayList<Integer>();
  ArrayList<Integer> last = new ArrayList<Integer>();
  Boolean hasImproved = null;
  
  public double average(int first, int last) {
    this.first.add(first);
    this.last.add(last);
    return super.average(first, last);
  }
  
  public boolean hasImproved() {
    hasImproved = true;
    return super.hasImproved();
  }
}