Assignment 1 (Due Date: 25/9)

Q1. Modify, compile, and run the HelloWorld program so that it prints the following

"This is my first Java program" (instead of "Hello world")

Q2. Please play around with the classpath settings with -classpath or -cp option and CLASSPATH environment

Assignment 2(Due Date: 25/9)

Q1. Create a new NetBeans project called "MyOwnHelloWorld" from scratch.
The program should display the following text when it runs.
This is my own NetBeans project, and I am damn proud of it.

Assignment 3(Due Date: 25/9)

Q1. Modify ConditionalOperator.java as adding the following lines of code at the appropriate place, compile and run the code

int salary = 100000;
Print "You are rich!" if the salary is over 50000. Print "You are poor!" otherwise.

Do the homework both using command line tools and using NetBeans.

Assignment 4(Due Date: 29/9)

Q1. Modify GreatestValue.java code so that it displays the greatest number and smallest number .

Assignment 5(Due Date: 2/10)

1. Modify GetInputFromKeyboard.java as following, compile and run the code

Make the program to ask the following question
- Please enter your mother's age:
Display added value of your age and your mother's age as following:
- The added value of your age and your mother's age is <whatever number>!
Implement the following logic
- If the added value is over 200, display
  - Hello <name>! You and your mother must be old!
- Otherwise
  - Hello <name>! You and your mother must be young!

Do the homework either at the command line or using NetBeans.

Assignment 6(Due Date: 2/10)

1. Modify GetInputFromKeyboardJOptionPane.java as following, compile and run the code

Make the program to ask the following question
- Please enter your age
Display the entered age as following
- If the age is over 100, display
- Otherwise

Do the homework either at the command line or using NetBeans.

Assignment 7(Due Date: 9/10)

Homework

1. Modify Grades.java as following, compile and run the code.

If the average is greater than 90 (average > 90), display "You worked too hard!" (instead of :-))
If the average is greater than 60 (average > 60) and less than or equal to 90 (average <= 90), display "You did OK."
If the average is less than or equal to 60 (average <= 60), display "You need to do some work."

Assignment 8(Due Date: 9/10)

Homework:

1. Modify NumWords.java as following, compile and run the code

Ask the user to enter another number using the following code fragment at the appropriate place.
- inputAnother = Integer.parseInt(JOptionPane.showInputDialog
  ("Enter another number"));
Compute the average of the two numbers and display the average.

Assignment 9(Due Date: 9/10)

Homework:

1. 1. Modify ArraySample.java as following, compile and run the code

Just before the for loop that prints out the value of each entry of the ages[] array (bold fonted code fragment above), create another for loop in which a value of 100 is assigned to the first entry of the array, ages[0], 101 to the next entry of the array, ages[1], and so on.

Do the homework either at the command line or using NetBeans.

2.Create a new NetBeans project which contains NamesAndAgesOfMyFamily.java source file as following:

Create a two dimentional array that contains the names and hobbies of your family members.
Display the names and hobbies of your family members as following. You have to use either for or while loop.
- Sang Shin: Golf, Tennis, Swimming
- Young Shin 90 years old: Walking, Reading
- Daniel Shin 20 years old: Snowboarding, Golf

Hint: You can see an example of 2-dimentional array from "Array of Arrays" Java tutorial

Assignment 10 (Due Date: 16/10) (This assignment is optional, But I would appreciate those who can do it.)

Homework:

1. Create a new NetBeans project which contains GreatestNameLength.java source file as following:

Ask the full names of three of your family members using showInputDialog() method of the JOptionPane class (as it is done in the GreatestNumber program).
Display the name of the family member who has the longest first name as following. (If there is a tie, just display one who is older.)
- Daniel Shin has the longest first name

Hint: You will have use various methods of String class. The following is an example code fragment you might be able to use. Please feel free to use alternative ways of doing the homework.

// Get the first name from a name string using split() instance (non-static) method
String[] nameArrayForPerson1 = person1NameInstance.split(" ");
String[] nameArrayForPerson2 = person2NameInstance.split(" ");

// Get the lengths of strings using length() instance (non-static) method
int lengthOfFirstNameOfPerson1 = nameArrayForPerson1[0].length();
int lengthOfFirstNameOfPerson2 = nameArrayForPerson2[0].length();

// Compare the lengths of the first names between person1 and person2
if (lengthOfFirstNameOfPerson1 > lengthOfFirstNameOfPerson2){
   System.out.println(nameArrayForPerson1[0] +
                              " has longer first name than " +
                              nameArrayForPerson2[0]);
}

Assignment 11(Due Date: 6/11)

1. Modify ClassAndObject.java as following, compile and run the code

Create another object instance of String class using new keyword. Initialize it with the following value. Display it using Sytem.out.println(..) method.
- "I am another object instance of String class"

Assignment 12(Due Date: 6/11)

1. Write StaticAndInstanceMethods2.java as following, and compile and see what compile errors you get. Fix any compile errors.

public class StaticAndInstanceMethods2{

    public static void main( String[] args ){

        // Create an instance of a String class by using a keyword "new".
        // For example, in order to create an object instance of a String class,
        // you will do the following
        String strInstance1 = new String ("I am object instance of a String class");

        // The following code will generate a compile error since you are trying to
// invoke a instance method through a class. Fix this compile error.
        char x = String.charAt(2);

    }

}

Code 9.2.b: StaticAndInstanceMethods2.java

Assignment 13(Due Date: 6/11)

1. Modify TestPassByValue.java as following. Compile and run the application.

Pass the second primitive type parameter to the test(..) method - you can choose any primitive type parameter (such as long or boolean).
Set the value of the second parameter before calling the test(..) method. And change the value of the passed parameter within the test(..) method as you did with the first parameter in Code-9.4 above.
Modify the System.out.println(..) methods in the Code-9.4 above to display the values of both the first parameter and second parameter.

Assignment 14(Due Date: 6/11)

1. Write EqualsTestInteger.java as following. Compile and run the application.

Compare object instances of Integer class using the same testing code as in EqualsTestString.java above.

Assignment 15(Due Date: 6/11)

Q1.

Modify StudentRecord.java as following

Add setMathGrade(double grade) method
Add setEnglishGrade(double grade) method
Add setScienceGrade(double grade) method

Modify StudentRecordExample.java as following

Create another StudentRecord object, call it myOwnRecord
Call setName() method of the myOwnRecord object passing "myOwn" as the value to set
Display the name of the myOwnRecord object

Set Math grade of myOwnRecord object
Set English grade of myOwnRecord object
Set Science grade of myOwnRecord object
Display the average grade of myOwnRecord object

Compile and run StudentRecordExample application

Assignment 16(Due Date: 6/11)

Q1. Modify StudentRecord.java as following

Add another overloaded print() method which takes the following three parameters

name
grade average
student count

Modify StudentRecordExmaple2.java as following

Invoke the newly added print() method

Assignment 17(Due Date: 6/11)

1. Write a class called Food under foodpackage.fruitpackage pacakge

Food.java should have the following package statement at the top

package foodpackage.fruitpackage

Add a couple of methods of your own in the Food.java.

Write a class called FoodMain under foodpackage.fruitpackage package

FoodMain class creates an Food object
FoodMain class then calls a method of Food object

Compile and run the code

Hint: The goal of this homework exercise is to let you experience s two-level package structure instead of just one. For example, the "foodpackage" is a parent package of the "fruitpackage" package. And each should have its own directory and they should reflect the parent and child relationship of the package structure. What this means is that you would have to create foodpackage directory first and then fruitpackage directory underneath it. Then you will create Food.java and FoodMain.java under fruitpackage directory.

Assignment 18(Due Date: 13/11)

1. Write TuftsStudent.java as following

TuftsStudent class extends Student class
Write a constructor of the TuftsStudent class as following
-      public TuftsStudent(){
          System.out.println("Inside TuftsStudent:Constructor");
       }

2. Modify the Main.java to create an instance of TuftsStudent class as following

TuftsStudent student2 =new TuftsStudent();
Student student3 =new TuftsStudent();

3. Compile and run the code. You should see the following:

Inside Person:Constructor
Inside Student:Constructor
Inside Person:Constructor
Inside Student:Constructor
Inside TuftsStudent:Constructor
Inside Person:Constructor
Inside Student:Constructor
Inside TuftsStudent:Constructor

Assignment 19(Due Date: 13/11)

1. In your TuftsStudent class, override getHobby() and setHobby() methods of the Student class as following

    public String getHobby(){
        System.out.println("Inside TuftsStudent:getHobby() method");
        return "My hobby is " + super.getHobby();
    }

    public void setHobby(String s){
        System.out.println("Inside TuftsStudent:setHobby() method");
        super.setHobby(s);
    }

2. Change Main.java to invoke setHobby() and getHobby() methods of the newly created TuftsStudent object instances as followoing.

        // set hobbies of student2 and student3
        student2.setHobby("swimming");
        student3.setHobby("dancing");

        // get hobbies of student2 and student3
        String hobby2 = student2.getHobby();
        System.out.println("Hobby of student2 " + hobby2);
        String hobby3 = student3.getHobby();
        System.out.println("Hobby of student3 " + hobby3);

3. Compile and run the code. You should see the following result.

Inside Person:Constructor
Inside Student:Constructor
Inside Person:Constructor
Inside Student:Constructor
Inside TuftsStudent:Constructor
Inside Person:Constructor
Inside Student:Constructor
Inside TuftsStudent:Constructor
Inside TuftsStudent:setHobby() method
Inside TuftsStudent:setHobby() method
Inside TuftsStudent:getHobby() method
Hobby of student2 My hobby is swimming
Inside TuftsStudent:getHobby() method
Hobby of student3 My hobby is dancing

Assignment 20(Due Date: 13/11)

1. Write another class called Teacher.java as following

Teacher class extends Person class
Teacher clsss also has the following method
-      // Override getName() method of the parent class
       public String getName(){
            System.out.println("Teacher: getName()");
          return "Maybe Passionate Teacher" + super.getName();
       }

2. Modify the Main.java in which, getName() method of the Teacher object gets called
3. Compile and run the code. You should see the following result.

C:\myjavaprograms>java -classpath . polypackage.Main
Inside Person:Constructor 2 receiving two parameters: Sang, 1 Dreamland
Inside Student:Constructor 2 receiving two parameters: Sang, 1 Dreamland
Inside Person:Constructor 2 receiving two parameters: Young, 2 Dreamland
Inside Employee:Constructor 2 receiving two parameters: Young, 2 Dreamland
Inside Person:Constructor 2 receiving two parameters: Wende, 21 New York
Inside Teacher:Constructor 2 receiving two parameters: Wende, 21 New York
Student: getName()
Person: getName()
Passionate Student Sang
Employee: getName()
Person: getName()
Not so Passionate Employee Young
Teacher: getName()
Person: getName()
Maybe Passionate Teacher Wende

Assignment 21(Due Date: 20/11)

1. Define another abstract method in the LivingThing.java as following

public abstract void dance(String dancingStyle);

2. Implement a concrete method in the Human.java that implements the dance() abstract method.

    public void dance(String ds){
        System.out.println("Human dances..." + ds);
    }

3. Compile and run the code

Assignment 22(Due Date: 20/11)

Define your own package (for example, myownpackage)
Define an interface called PersonInterface.java under the package above. This interface containt the following abstract methods.

void setName(String myName);
void setAge(int myAge);

Define another interface called SportInterface.java under the package above. This interface containt the following abstract methods.

String getMyFavoriteSport();
void setMyFavoriteSport(String sportName);
int howMuchItCostToPlayThisSport();

Define the third interface called HobbyInterface.java under the package above. The interface contains the following abstract methods.

String whatIsMyHobby();
void setMyHobby(String hobby);

Write a class called SportAndHobbyImpl.java that implements the all three interfaces defined above - PersonInterface, SportInterface and HobbyInterface interfaces. Provide whatever approproate business logic in the methods that implement the abstract methods defined in these three interfaces.

5. Write MyMain.java as following.

It contains the main method.
It creates two object instances of the SportAndHobbyImpl class as following.

SportAndHobbyImpl x1= new SportAndHobbyImpl();
SportAndHobbyImpl x2= new SportAndHobbyImpl();

It sets the Name field of the object instances above using the setName(String myName) method of SportInterface interface as following.

x1.setName("Sang Shin");
x1.setAge(20);
x2.setName("James Gosling");
x2.setAge(30);

It sets other fields - MyFavoriteSport and MyHobby - via setMyFavoriteSport(String sportName) and setMyHobby(String hobby) methods.
It computes theCostToPlayThisSport as following:

age * 10

Check if x1 is a type of SportInterface or not using instanceof keyword as following

boolean b1 = x1 instanceof SportInterface;

Check if x2 is a type of HobbyInterface or not using instanceof keyword as following

boolean b2 = x2 instanceof HobbyInterface;

Display the Name, Age, MyFavoriteSport, MyHobby, theCostToPlayThisSport fields of the two object instances.
Display the boolean results above

Assignment 23(Due Date: 27/11)

Q1. Using JDBC, Create a table COFFEES

Table COFFEES has following fields
   COF_NAME varchar(32)
   SUP_ID int
   PRICE float
   SALES int
   TOTAL int

Q2. After creating table, Insert Records in the table COFFEES.
Your program should work as follows
   Ask the user before inserting a record.
   If user says yes, then get the value of fields from him
   After receiving values from user, insert the record
   Again ask the user if he want to insert a record, i.e. go to step1.
   Repeat these steps until user answers NO

Q3. After Q2 is finished, display all the record in table format.