[考古] 物件導向設計/張貴忠/972-期中考

[Courake (courake)]

[開課學院]: 資電學院
[開課系所]: 資訊系
[課程名稱]: 物件導向設計
[老師名稱]: 張貴忠  老師
[開課學期]: 97-2
[類型]: 97-2 期中考

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1. (Basic OOD Concept - 15pts ) Just a brief explanation
   (a) Class Constructor
   (b) Encapsulation
   (c) Overloading

2. (Class Concept -10pts ) Define the terms class and object. What's the
   difference between class and object?

3. (Class Concept -10pts ) When used with objects, what is the equality( == )
   operator really comparing? How to design a real equality operation to
   compare the content of two objects (briefly describe)?

4. (Defining Class -20pts ) Write a Java class that represents a People with
   String-type instance variables name, id. Include at least 2 constructors
   , 3 accessors and 3 mutators. Write a simple main program to create one
   People object.

5. (Flow Control -15pts ) Write a complete Java progrm that uses a "for loop"
   to compute the product of the even numbers and the sum of the odd numbers
   between 1 and 25.

6. (Advanced Class & Object Concept -30pts) Find all compiler-time only in the
   MidExamClass, and give brief explanation. When you correct all errors, what
   is the output of the code?

public class MidExamClass
{
    private String              mName;
    private int                 mNumber;
    private static int          mCount;
    public static final int     GRADE = 60;

    public void set(String newName, int newNumber)
    {
        mName = newName;
        mNumber = newNumber;
        mCount++;
    }

    public void set(String newName, double newNumber)
    {
        mName = newName;
    }

    public boolean set(String oldName, double oldNumber)
    {
        mName = oldName;
    }

    public MidExamClass(int number)
    {
        this.mNumber = number;
    }

    public String toString()
    {
        return (mName + " " + mNumber + " " + mCount++);
    }

    public void makeEqual(MidExamClass anObject)
    {
        anObject.mName = this.mName;
        anObject.mNumber = this.mNumber;
    }

    public static void tryToMakeEqual(int aNumber)
    {
        toString();
        aNumber = this.mNumber;
    }

    public boolean equals(MidExamClass otherObject)
    {
        int grade = otherObject.GRADE;
        return ((mName.equals(otherObjec.mName))
                && (mNumber == otherObject.mNumber) );
    }
}//end of class definition

public class ParametersDemo
{
    public static void main(String[] args)
    {
        MidExamClass object1 = new MidExamClass();
        MidExamClass object2 = new MidExamClass();
        MidExamClass object3 = new MidExamClass();

        object1.set("AAA",1);
        object2.set("BBB",2);
        object3.set("CCC",3);

        System.out.println("Valus of object2 before call:");
        System.out.println(object2);

        object1 = object3;
        object1.makeEqual(object2);

        System.out.println("Value of object2 after call:");
        System.out.println(object2);
    }//end of main method
}//end of class











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