SSD1【Unit2】答案【Exercise4-7，Practical Quiz 4-7】

English Specification for Catfish class:- Attributes and behaviors similar to those for AlgaeColony ========================================================= Constant class attributes: ALIVE: Private attribute. Represents status of Catfish that is alive as a String. DEAD: Private attribute. Represents status of Catfish that is dead as a String. SPECIES: Private attribute. Represents species of lifeform as a String. BABY_MAX_ENERGY: Private attribute. Represents maximum energy that can be carried as an integer. BABY_MIN_ENERGY: Private attribute. Represents minimum energy needed to stay alive as an integer. ENERGY_TO_EAT: Private attribute. Represents energy needed to eat AlgaeColony as an integer. ENERGY_TO_SWIM: Private attribute. Represents energy needed to swim as an integer. ENERGY_TO_LOOK_FOR_FOOD: Private attribute. Rpresents the energy a catfish must expend to look for food in the form of AlgaeColony as an integer. ENERGY_IN_A_FULL_MEAL: Private attribute. Represents the energy a catfish can gain from a full meal of AlgaeColony as an integer. MIN_ENERGY_GROWTH_INCREMENT: Private attribute. Represents the amount by which the minimum energy required by each catfish to stay alive increases in a time block as an integer. MAX_ENERGY_GROWTH_INCREMENT: Private attribute. Represents the amount by which the maximum energy stored by each catfish increases in a time block as an integer. Constant instance attributes: name: Private attribute. Represents unique name as a String Instance attributes: row: Private attribute. Represents row identifying the location as an integer. column: Private attribute. Represents column identifying the location as an integer. deadOrAlive: Private attribute. Represents living status as a String. energy: Private attribute. Represents current energy level as a String. age: Private attribute. Represents age as an integer. simulation: Private attribute. Represents simulation to which the Catfish belongs as an object of Simulation class. minEnergy: Private attribute. Represents minimum energy needed to survive as an integer. maxEnergy: Private attribute. Represents maximum energy that can be carried as an integer. Class attributes: nCatfishCreated: Private attribute. Represents number of Catfish created so far as an integer, to help the Simulation object keep track of the total number of Catfish in the simulation. Behaviors: Constructor: Create an instance of the Catfish class. liveALittle: Live a block of time. Part of the public interface. die: Update living status to being dead. Returns nothing. Part of the private interface. getRow: Return the row in which Catfish is located as an integer. Part of the public interface. getColumn: Return the column in which Catfish is located as an integer. Part of the public interface. getAge: Return the age of Catfish as an integer. Part of the public interface. getName: Return the unique name identifying the Catfish as a String. Part of the public interface. getImage: Return an image representing the Catfish. Part of the public interface. getMinEnergy: Return the minimum energy needed to stay alive as an integer. Part of the private interface. getMaxEnergy: Return the maximum energy that can be carried as an integer. Part of the private interface. getEnergy: Return the current energy level as an integer. Part of the public interface. isDead: Return the living status of the Catfish as a boolean. Part of the public interface. getDisplayMechanism: Return the mechanism used for displaying the Catfish as a String. Part of the public interface. getSpecies: Return the species of the Catfish as a String. Part of the public interface. getColor: Return the color of the Catfish as a String. Part of the public interface. setEnergy: Set the energy level as specified by the integer value passed as a parameter. Part of the private interface. Attributes and behaviors specific to Catfish =========================================== Instance attribute: direction: This private attribute represents the direction in which the Catfish is facing as a String Constant class attributes: RIGHT: Private attribute. Represents the direction of Catfish facing right as a String. LEFT: Private attribute. Represents the direction of Catfish facing left as a String. UP: Private attribute. Represents the direction of Catfish facing up as a String. DOWN: Private attribute. Represents the direction of Catfish facing down as a String. Behaviors: moveToRow: Move the Catfish to the row specified by the integer value passed as a parameter. Returns the row where the Catfish is moved as an integer. Part of the private interface. moveToColumn: Move the Catfish to the column specified by the integer value passed as a parameter. Returns the column where the Catfish is moved as an integer. Part of the private interface. isHungry: Check if the current energy level of the Catfish is less than twice the amount needed for survival. Returns a boolean. Part of the private interface. getDirection: Check the direction in which the Catfish is facing. Returns a String. Part of the private interface. lookForFoodInNeighborhood: Try to locate any AlgaeColony close by. Relinquish some energy in the process. Note that this behavior requires a way to store the neighboring AlgaeColony objects. Your knowledge of Vectors from 2.2.3 Lifecycle of Objects can help you here. Part of the private interface. swimIfPossible(): The catfish swims to a new location in the lake if possible. Returns nothing. Part of the public interface. eatIfPossible: Make the catfish "eat" AlgaeColony , gain energy from a full meal of AlgaeColony(i.e.the energy it stores is increased). Returns nothing. Part of the public interface.