Question

public class CylindricalTank {

   private String idTag;           // Unique String identifying the tank
   private double radius;           // The non-negative radius of the base of the tank in meters
   private double height;           // The non-negative height of the tank in meters
   private double liquidLevel;       // The current height of the liquid in the tank in meters

   /**
   * CylindricalTank General Constructor
   */
   public CylindricalTank(String tag, double radius, double height, double liquidLevel) {
       super();
       this.idTag = tag;
       this.radius = radius;
       this.height = height;
       this.liquidLevel = liquidLevel;
   }

   /**
   * Exercise #1
   * Copy Constructor creates a tank with the same properties as the parameter tank.
   */
   public CylindricalTank(CylindricalTank t) {
       // YOUR CODE HERE
       this.idTag = t.getIdTag();
       this.radius = t.getRadius();
       this.height = t.getHeight();
       this.liquidLevel = t.getLiquidLevel();
   }

   // Getters
   public String getIdTag() { return idTag; }
   public double getRadius() { return radius; }
   public double getHeight() { return height; }
   public double getLiquidLevel() { return liquidLevel; }

   // Setters
   public void setRadius(double radius) { this.radius = radius; }
   public void setHeight(double height) { this.height = height; }
   public void setLiquidLevel(double liquidLevel) { this.liquidLevel = liquidLevel; }

   // Instance Methods

   /**
   * Returns true if both the target and parameter tanks have the same id
   */
   public boolean equals(Object t2) {
       if (t2 instanceof CylindricalTank) {
           CylindricalTank ct = (CylindricalTank) t2;
           return this.getIdTag().equals(ct.getIdTag());
       }
       return false;
   }

   /**
   * Returns the Cylindrical Tank as a string.
   */
   public String toString() {
       return "CylindricalTank[id=" + this.getIdTag() + "]";
   }

   /**
   * Returns the maximum volume of liquid that the tank can hold in cubic meters.
   */
   public double getCapacity() {
       return Math.PI * this.radius * this.radius * this.height;
   }

   /**
   * Returns the current volume of liquid that the tank holds in cubic meters.
   */
   public double getLiquidVolume() {
       return Math.PI * this.radius * this.radius * this.liquidLevel;
   }

   /**
   * Exercise #2
   * Returns the current volume of liquid that the tank can hold in gallons.
   *
   * Hint: 1 Cubic Meter is equivalent to 264 US Gallons.
   */
   public double getLiquidVolumeInGallons() {
       // YOUR CODE HERE
       double currentVolume = getLiquidVolume();
       double gallons = 264;
       double result = currentVolume*gallons;
       return result;
   }
  
   /**
   * Exercise #3
   * Compares the capacity (volume) of the target tank and the parameter tank.
   * Returns 0 if they have the same capacity, 1 if the target tank has larger capacity
   * and -1 otherwise.
   */
   public int compareTo(CylindricalTank t) {
       // YOUR CODE HERE
       if (this.getLiquidVolume() == t.getLiquidVolume()) {
           return 0;
       }
       else if (this.getLiquidVolume() < t.getLiquidVolume()) {
           return -1;
       }
       else
           return 1;
   }

   /**
   * Exercise #4
   * Modifies the target tank and add to it as much of the volume of liquid specified
   * by the cubicMeters parameters as possible. If the tank cannot hold all the liquid then it
   * should become full and the remainder of the liquid should be simply ignored.
   *
   * Note: This method must return the instance object (this).
   */
   public CylindricalTank add(double cubicMeters) {
       // YOUR CODE HERE
       this.liquidLevel += cubicMeters;
       if (this.getLiquidLevel() > this.getCapacity()) {
           this.liquidLevel = this.height;
       }
      
       return this;// Leave return as is as the method should return target object
   }

  
   /**
   * Exercise #5
   * Returns a string indicating the percent of its volume that the tank is full ignoring
   * any fractional part. For instance if the tank is exactly half way full the method should return the
   * String "50% Full". If the tank is exactly one third full the method should return the
   * String "33% Full". If the tank is empty the method should return the String "Empty".
   * HINT: To convert a double to an int you can cast it as follows (int)5.3 yields 5.
   */
   public String getPercentFilled() {
       // YOUR CODE HERE
       return ;
   }
}

J Unit

public class CylindricalTank {

   private String idTag;           // Unique String identifying the tank
   private double radius;           // The non-negative radius of the base of the tank in meters
   private double height;           // The non-negative height of the tank in meters
   private double liquidLevel;       // The current height of the liquid in the tank in meters

   /**
   * CylindricalTank General Constructor
   */
   public CylindricalTank(String tag, double radius, double height, double liquidLevel) {
       super();
       this.idTag = tag;
       this.radius = radius;
       this.height = height;
       this.liquidLevel = liquidLevel;
   }

   /**
   * Exercise #1
   * Copy Constructor creates a tank with the same properties as the parameter tank.
   */
   public CylindricalTank(CylindricalTank t) {
       // YOUR CODE HERE
       this.idTag = t.getIdTag();
       this.radius = t.getRadius();
       this.height = t.getHeight();
       this.liquidLevel = t.getLiquidLevel();
   }

   // Getters
   public String getIdTag() { return idTag; }
   public double getRadius() { return radius; }
   public double getHeight() { return height; }
   public double getLiquidLevel() { return liquidLevel; }

   // Setters
   public void setRadius(double radius) { this.radius = radius; }
   public void setHeight(double height) { this.height = height; }
   public void setLiquidLevel(double liquidLevel) { this.liquidLevel = liquidLevel; }

   // Instance Methods

   /**
   * Returns true if both the target and parameter tanks have the same id
   */
   public boolean equals(Object t2) {
       if (t2 instanceof CylindricalTank) {
           CylindricalTank ct = (CylindricalTank) t2;
           return this.getIdTag().equals(ct.getIdTag());
       }
       return false;
   }

   /**
   * Returns the Cylindrical Tank as a string.
   */
   public String toString() {
       return "CylindricalTank[id=" + this.getIdTag() + "]";
   }

   /**
   * Returns the maximum volume of liquid that the tank can hold in cubic meters.
   */
   public double getCapacity() {
       return Math.PI * this.radius * this.radius * this.height;
   }

   /**
   * Returns the current volume of liquid that the tank holds in cubic meters.
   */
   public double getLiquidVolume() {
       return Math.PI * this.radius * this.radius * this.liquidLevel;
   }

   /**
   * Exercise #2
   * Returns the current volume of liquid that the tank can hold in gallons.
   *
   * Hint: 1 Cubic Meter is equivalent to 264 US Gallons.
   */
   public double getLiquidVolumeInGallons() {
       // YOUR CODE HERE
       double currentVolume = getLiquidVolume();
       double gallons = 264;
       double result = currentVolume*gallons;
       return result;
   }
  
   /**
   * Exercise #3
   * Compares the capacity (volume) of the target tank and the parameter tank.
   * Returns 0 if they have the same capacity, 1 if the target tank has larger capacity
   * and -1 otherwise.
   */
   public int compareTo(CylindricalTank t) {
       // YOUR CODE HERE
       if (this.getLiquidVolume() == t.getLiquidVolume()) {
           return 0;
       }
       else if (this.getLiquidVolume() < t.getLiquidVolume()) {
           return -1;
       }
       else
           return 1;
   }

   /**
   * Exercise #4
   * Modifies the target tank and add to it as much of the volume of liquid specified
   * by the cubicMeters parameters as possible. If the tank cannot hold all the liquid then it
   * should become full and the remainder of the liquid should be simply ignored.
   *
   * Note: This method must return the instance object (this).
   */
   public CylindricalTank add(double cubicMeters) {
       // YOUR CODE HERE
       this.liquidLevel += cubicMeters;
       if (this.getLiquidLevel() > this.getCapacity()) {
           this.liquidLevel = this.height;
       }
      
       return this;// Leave return as is as the method should return target object
   }

  
   /**
   * Exercise #5
   * Returns a string indicating the percent of its volume that the tank is full ignoring
   * any fractional part. For instance if the tank is exactly half way full the method should return the
   * String "50% Full". If the tank is exactly one third full the method should return the
   * String "33% Full". If the tank is empty the method should return the String "Empty".
   * HINT: To convert a double to an int you can cast it as follows (int)5.3 yields 5.
   */
   public String getPercentFilled() {
       // YOUR CODE HERE
       return ;
   }
}

Answer 1

I fixed the code in add() method and also implemented the getPercentFilled() method. Please do rate the answer if it helped. Thank you.

public class CylindricalTank {

private String idTag; // Unique String identifying the tank
private double radius; // The non-negative radius of the base of the tank in meters
private double height; // The non-negative height of the tank in meters
private double liquidLevel; // The current height of the liquid in the tank in meters

/**
* CylindricalTank General Constructor
*/
public CylindricalTank(String tag, double radius, double height, double liquidLevel) {
super();
this.idTag = tag;
this.radius = radius;
this.height = height;
this.liquidLevel = liquidLevel;
}

/**
* Exercise #1
* Copy Constructor creates a tank with the same properties as the parameter tank.
*/
public CylindricalTank(CylindricalTank t) {
// YOUR CODE HERE
this.idTag = t.getIdTag();
this.radius = t.getRadius();
this.height = t.getHeight();
this.liquidLevel = t.getLiquidLevel();
}

// Getters
public String getIdTag() { return idTag; }
public double getRadius() { return radius; }
public double getHeight() { return height; }
public double getLiquidLevel() { return liquidLevel; }

// Setters
public void setRadius(double radius) { this.radius = radius; }
public void setHeight(double height) { this.height = height; }
public void setLiquidLevel(double liquidLevel) { this.liquidLevel = liquidLevel; }

// Instance Methods

/**
* Returns true if both the target and parameter tanks have the same id
*/
public boolean equals(Object t2) {
if (t2 instanceof CylindricalTank) {
CylindricalTank ct = (CylindricalTank) t2;
return this.getIdTag().equals(ct.getIdTag());
}
return false;
}

/**
* Returns the Cylindrical Tank as a string.
*/
public String toString() {
return "CylindricalTank[id=" + this.getIdTag() + "]";
}

/**
* Returns the maximum volume of liquid that the tank can hold in cubic meters.
*/
public double getCapacity() {
return Math.PI * this.radius * this.radius * this.height;
}

/**
* Returns the current volume of liquid that the tank holds in cubic meters.
*/
public double getLiquidVolume() {
return Math.PI * this.radius * this.radius * this.liquidLevel;
}

/**
* Exercise #2
* Returns the current volume of liquid that the tank can hold in gallons.
*
* Hint: 1 Cubic Meter is equivalent to 264 US Gallons.
*/
public double getLiquidVolumeInGallons() {
// YOUR CODE HERE
double currentVolume = getLiquidVolume();
double gallons = 264;
double result = currentVolume*gallons;
return result;
}
  
/**
* Exercise #3
* Compares the capacity (volume) of the target tank and the parameter tank.
* Returns 0 if they have the same capacity, 1 if the target tank has larger capacity
* and -1 otherwise.
*/
public int compareTo(CylindricalTank t) {
// YOUR CODE HERE
if (this.getLiquidVolume() == t.getLiquidVolume()) {
return 0;
}
else if (this.getLiquidVolume() < t.getLiquidVolume()) {
return -1;
}
else
return 1;
}

/**
* Exercise #4
* Modifies the target tank and add to it as much of the volume of liquid specified
* by the cubicMeters parameters as possible. If the tank cannot hold all the liquid then it
* should become full and the remainder of the liquid should be simply ignored.
*
* Note: This method must return the instance object (this).
*/
public CylindricalTank add(double cubicMeters) {
double vol = getLiquidVolume() + cubicMeters;
if(vol >= getCapacity()) {
   liquidLevel = height;
}
else {
   liquidLevel = vol / (Math.PI * getRadius() * getRadius());
}
  
return this;// Leave return as is as the method should return target object
}

  
/**
* Exercise #5
* Returns a string indicating the percent of its volume that the tank is full ignoring
* any fractional part. For instance if the tank is exactly half way full the method should return the
* String "50% Full". If the tank is exactly one third full the method should return the
* String "33% Full". If the tank is empty the method should return the String "Empty".
* HINT: To convert a double to an int you can cast it as follows (int)5.3 yields 5.
*/
public String getPercentFilled() {
   int per = (int)(getLiquidLevel() * 100.0 / getCapacity());
     
   if(per == 0) {
       return "Empty";
   }
   else {
       return per + "% Full";
   }
}
}