Java4

Course Code : IT 401

Assignment 4

Note :

· Due date: 01 /05 /2016

· 15 Marks Value 15/3 =5 Marks

· Copied assignment will be graded zero mark.

· Assignment submitted after due date will not be accepted; it will be considered to be late and will have zero mark.

Q1. Write the syntax for

· declaring an array holding 10 String values

· declaring an ArrayList holding String values. [1 Points]

Q2. Use a for loop to fill an Arraylist with the square of the numbers 1 to 10. The output should be ( 1, 4, 9, 16, ..100): [3 Points]

Q3. Rewrite the following loops, using the "for each" construct. Here data is an array of double values. [1 point]

for (int i = 0; i < data.length; i++)

        sum = sum + data[i];

Q4. Write preconditions for the following methods. Do not implement the methods. [3 point]
a. public static double sqrt(double x) 
b. public static String romanNumeral(int n) 
c. public static String weekday(int day) 




Q4. Define class cohesion and class coupling.  [1 Points]



Q5. What is a static method ? What is a static variable ? Explain and provide examples.  [2 Points]



Q6. What is an Immutable Class ? [1 Point]


Q7. Draw a memory diagram that shows why the following method can't swap two BankAccount objects. [3 point]
public static void falseSwap(BankAccount a, BankAccount b)
{
    BankAccount temp = a;
    a = b;
    b = temp;
}