CS 103

Outline of Material for the Final Exam

The following is a brief outline of the material which will be covered on the final exam. All of this information can be found in the lecture notes and/or on this web page. Remember, the final exam will be comprehensive.

General Facts about Programming
1. What is programming?
2. What is binary code?
3. What is assembly language?
4. What is a high level computer language?
5. What is a source code file?
6. What does a compiler do?
7. What is Java byte code?
8. What is the difference between a .java file and a .class file?
9. What is the difference between a primitive/atomic variable and a reference variable?
Java Programming
You should know how to:
1. Write a simple Java program with correct syntax. An example of this would be the simple HelloWorld program. Make sure you have syntax correct in all statements, that curly braces and parentheses are correct, that semicolons are in the correct locations, that there is a main() method with correct arguments inside the class definition.
2. Declare variables of any of the primitive/atomic data types and store values in those variables. (char, short, int, long, float, and double). For example:
```
		int x; // Declare an integer variable called x
		x = 3; // Store the value 3 in the variable x
				
```
3. Show how to write a for loop using correct syntax. For example, if given "Show how to write a for loop that will print 'Hello, Java World' 10 times." The answer would be:
```
		for(int i=0; i<10; i++)
		{
			System.out.println("Hello, Java World");
		}
				
```
4. Show how to write a while loop using correct syntax. For example, if given "Show how to write a while loop that will print 'Hello, Java World' 10 times." The answer would be:
```
		int i=0;
		while(i < 10)
		{
			System.out.println("Hello, Java World");
			i++;
		}
				
```
5. Show how to write a do..while loop using correct syntax. For example, if given "Show how to write a do..while loop that will print 'Hello, Java World' 10 times." The answer would be:
```
		int i=0;
		do
		{
			System.out.println("Hello, Java World");
			i++;
		}
		while(i < 10)
				
```
6. Show how to write an if statement. For example, "How would you write an if statement to print 'Correct' if the int variable ans is equal to 3." The answer would be.
```
		if(ans == 3)
		{
			System.out.println("Correct");
		}
				
```
7. Show how to write an if...else statement. For example, "How would you write an if..else statement to print 'Correct' if the int variable ans is equal to 3, but print 'Incorrect' if it is any other value." The answer would be.
```
		if(ans == 3)
		{
			System.out.println("Correct");
		}
		else
		{
			System.out.println("Incorrect");
		}
				
```
8. Show how to write an if statement that will test true if two conditions are both true. For example, "How would you write an if statement to print 'In range' if the int variable val is greater than or equal to 3 AND less than 10." The answer would be.
```
		if((val >= 3) && (val < 10)
		{
			System.out.println("In range");
		}
				
```
9. Show how to write an if statement that will test true if either of two conditions are true. For example, "How would you write an if statement to print 'OK' if the int variable A is greater than or equal to 3 ORthe int variable B is less than 10." The answer would be.
```
		if((A >= 3) || (B < 10)
		{
			System.out.println("OK");
		}
				
```
10. Show how to write a switch statement. For example, "How would you write a switch statement to print 'Cold' if the int variable val is equal to 1, 'Cool' if val is 2, 'Warm' if val is 3, 'Hot' if val is 4, but 'Invalid answer' if val is any other value. The answer would be.
```
		switch(val)
		{
			case 1 : 
				System.our.println("Cold");
				break;
			case 2 : 
				System.our.println("Cool");
				break;
			case 3 : 
				System.our.println("Warm");
				break;
			case 4 : 
				System.our.println("Hot");
				break;
			default : 
				System.our.println("Invalid answer");
				break;
		}
				
```
Mathematical Calculations in Java
1. Identify each of the math operators in Java, i.e. + (Addition), - (Subtraction), * (Multiplication), / (Division), % (Mod division with integers-returns remainder).
2. What does precedence refer to in math formulas in Java?
3. Why do you use parentheses in math formulas in Java?
4. Given a mathematical formula show how you would write the formula in Java. Remember, pay careful attention to where you would need to use parentheses to ensure the calculations are done in the correct order, and where you need to use mathematical operators. For example to multiply (2+3) by (4+5) you must use ((2+3)*(4+5)). Neither ((2+3)(4+5)) nor ((2+3)^.(4+5)) will work.
Object Oriented Programming with Classes
You should know:
1. What is a class?
2. What is an object in Object Oriented Programming?
3. What do the terms instantiate and instance mean in Object Oriented Programming with Java?
4. When you define a class where do the member variables go?
5. What is the new operator used for in a program. Give an example of its' use.
Strings and Character Variables in Java
You should know:
1. Show how you would define a char variable called ch and store the character A in it.
2. What does the acronym ASCII stand for?
3. Show how you would create a String reference variable and initialize it to "This is a test string.".
4. Given a String variable called str show how you would set it to hold the phrase "Java is fun!".
5. Given each of the following functions which are part of the String class and the string str containing "Java is Fun!" explain what each does or what it will return: str.charAt(1), str.compareTo("JAVA IS FUN"), str.concat(" Right?!"), indexOf('i'), indexOf("Fun"), str.length(), str.substring(0, 4), str.toLower(), str.toUpper.

Using Eclipse
You should know:

You have just typed the following into a class file after the opening {. Eclipse underlines JPanel in red. How do you fix the problem?
You have just created the class MyMenuBar and want to make it a sub-class of JMenuBar. What do you add to this line?
```
	
	public class MyMenuBar
	{
	
	
```
You have just typed the following to make MyClass a sub-class of JFrame. Eclipse underlines JFrame in red. How do you fix the problem?
You defined a member variable of type JTextField in your class and called it m_StatusTextField. When you type the following Eclipse indicates an error. What is the problem and how do you fix it?

You have just typed the following in the class file for GUIDemoMenuBar and Eclipse has flagged errors on every line after the declaration private JMenu m_FileMenu; But, there are no syntax errors apparent. What is the problem and how do you fix it?

public class GUIDemoMenuBar  extends JMenuBar
{
	/** The File menu */
	private JMenu	m_FileMenu;
	m_FileMenu = new JMenu("File");  
	m_FileMenu.setMnemonic(KeyEvent.VK_F); // "F" for File
	m_FileMenu.getAccessibleContext().setAccessibleDescription("Load and save files, etc.");
	m_FileMenu.setBackground(Color.lightGray);
	this.add(m_FileMenu);
	public GUIDemoMenuBar()
	{
	}
}

In each of the following lines taken from a Java program, Eclipse has flagged a syntax error. Identify and fix the error.

	if(x == 3) && (y == 4)                           // x and y are both integers
	m_MainPanel.setSize(640, 480)                    // m_MainPanel is a JPanel
	m_Label1.setLocation(32);                        // m_Label1 is a JLabel
	while(count <= 3                                 // count is an integer
	m_StatusTF = New JTextField();                   // m_StatusTF is a JTextField
	m_MainPanel.add(JSlider);                        // m_MainPanel is a JPanel
	m_TextButton1.setBackgroundColor(Color.WHITE);   // m_TextButton1 is a JButton
	listData.add(new String("List item 01);          // listData is a Vector
	public static void main(String args)             // start of the main() function
	if(val = 2.5)                                    // val is a double
	for(int i=0, i<10, i++)                          // start of a for loop
	System.out.println("Num = ", num);               // num is an integer