INFO5100-Assignment 3 Solved

Q1.  Write java program uses abstract classes and methods, the program should implement the design indicated in the UML diagram below.

 

Moody object : 

// Return the mood : sad or happy – depending on which object sends the message abstract String getMpod();

// Each Object expresses a different motion abstract void ExpressFeelings();

//an object responds according to how it feels, print ”I feel Happy(or Sad) today!!” Public void queryMood()

Sad Object: 

//returns string indicating sad public String getMood();

//print crying string “‘waah’  ‘boo hoo’  ‘weep’ ‘sob’” public void expressFeelings();

//returns message about self : “Subject cries a lot” public String toString();

Happy Object: 

//returns string indicating happy public String getMood();

//print laughter string “heeehee….hahahah…HAHAHA!!” public void expressFeelings();

//returns message about self: “Subject laughs a lot” public String toString();

Psychiatrist Object: 

//asks moody object about its mood public void examine(moodyObject moodyObject);

//a moodyObject is observed to either laugh or cry public void observe(moodyObject moodyObject);

//returns message about self: “Subject laughs a lot” public String toString();

Write a main() method that creates a psychiatrist object and 2 moody objects. The psychiatrist object will examine and observe each moodyObject. Output of the program will look like below:

O/P:

How are you feeling today? I feel happy Today

heeehee….hahahah…HAHAHA!!

Observation: Subject laughs a lot

How are you feeling today? I feel sad Today

‘waah’  ‘boo hoo’  ‘weep’ ‘sob ‘

Observation: Subject cries a lot

Q2.  This java program uses interfaces, the program should implement the design indicated in the UML diagram below.

 

MathOperation.java public interface MathOperation {

public int performOperation(int num1, int num2);

}

AddOperation.java public class AddOperation implements MathOperation{

// Implement your code here

}

SubtractOperation.java public class SubtractOperation implements MathOperation{ // Implement your code here

}

MultiplyOperation.java public class MultiplyOperation implements MathOperation{

// Implement your code here

}

Context.java public class Context {

MathOperation operation; public Context(MathOperation operation) { this.operation = operation;

}

public int execute(int num1, int num2) { // Implement your code here

}

}

Client.java public class Client { public static void main(String[] args) {

Context contextAdd = new Context(new AddOperation());

System.out.println(contextAdd.execute(5, 15)); // Expects 20

Context contextSubtract = new Context(new SubtractOperation());

System.out.println(contextSubtract.execute(50, 40)); // Expects 10

Context contextMultiply = new Context(new MultiplyOperation());

System.out.println(contextMultiply.execute(4, 25)); // Expects 100

}

}

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