Programming Fundamentals I Java Programming ICE0124ITB0121

1
Programming Fundamentals I Java
Programming(ICE0124/ITB0121)
July 4th, 2005 Lab No. 2

• Tae-ho Hwang (fanteo.AT.icu.ac.kr)
• Eru Hojin Kim (eruhkim.AT.icu.ac.kr)

2
2 Concept of class and object, and Control
statement
3
Agenda for Today

• Explanation on class and object
• Control statements
• if
• for, while, do while
• switch
• Practice together!
• Assign Homework 2

4
Explanation on class and object

• Java an object-oriented programming language
• Performing a task in a program requires a method.
• The program unit that houses a method is called a
  class.
• A class can be used to create an instance of the
  class called an object.
• A class has specified attributes that the object
  will have.
• Class instance creation expressions beginning
  with keyword new create new objects.

5
Explanation on class and object

• public an access modifier
• public available to the public so it can be
  called by other classes declared outside the
  class declaration
• protected intermediate level of access to the
  method or variable (we will see later)
• private minimum level of access to the method or
  variable (we will see later)
• Method
• Arguments
• Parameters

6
Control statements

• Condition
• if
• if (age
• else if ((age 18) (age
• else
• switch
• switch (age)
• case 1
• break
• Iteration
• for
• for (i 0 i
• while
• while (age
• do while
• do
• while (age

7
Practice together

• Get two integers, one is base number of
  multiplication, the other is the number of column
• Print out the result of multiplication

8
Practice together (Contd)
9
Practice together

• // Lab 2_1 2005-07-04
• // 20050001 Gildong Hong
• import java.util.Scanner
• public class Lab2_1
• public static void main(String args)
• Scanner input new Scanner(System.in)
• int number1
• int number2
• System.out.print("Enter first integer ")
• number1 input.nextInt()
• System.out.print("Enter second integer ")
• number2 input.nextInt()

Lab2_1.java
10
Practice together (Contd)

• int i 1
• while (i
• System.out.printf("dd2d\t", number1, i,
  number1 i)
• if (i number2 0)
• System.out.println()
• i

Lab2_1.java
11
Practice together

• Get the integer number as number1
• Generate random number as number2
• If the random number number2 is different from
  number1, print out the number2 and repeat above
  action
• Otherwise exit the program with printing out END
  with ? message

12
Class Random

• Generate random numbers Random rnd new
  Random() number rnd.nextInt(100)
• Above code generates the random integer number
  from 0 to 100 which includes 0 and excludes 100
• import java.util.Random

13
Practice together (Contd)
14
Practice together

• // Lab 2_2 2005-07-04
• // 20050001 Gildong Hong
• import java.util.Scanner
• import java.util.Random
• public class Lab2_2
• public static void main(String args)
• Scanner input new Scanner(System.in)
• int number1
• int number2
• Random rnd new Random()
• System.out.print("Enter the integer ")
• number1 input.nextInt()

Lab2_2.java
15
Practice together (Contd)

• while (number1 ! (number2 rnd.nextInt(100)))
  
• System.out.println(number2)
• System.out.printf("END with d", number2)

Lab2_2.java
16
Assign Homework 2

• Create a Java program, Homework2.java that does
  the following things
• Input 2 integer values, one determines the shape
  of triangle, the other does the number of in a
  row or column
• Draw triangle using while statement

17
Assign Homework 2 (Contd)
18
Assign Homework 2 (Contd)
19
Assign Homework 2 (Contd)

• Submission
• Compress the files to zip file (not alz) named
  like ICE0124_20050001_HW2.zip
• Mail subject should be likeICE0124 Homework 2
  by 20050001 ???
• Send to eruhkim.AT.icu.ac.kr
• Due date 2005-07-11 180000
• 50 penalty if the homework is late or you dont
  keep the above rules