lab class definition 2

Study Display 4.4 (2nd ed. and 3rd ed.) or Display 4.2 & Display 4.3 (1st ed.) and then


1. Comment out date.setDate(6, 17, year); by // date.setDate(6, 17, year);


2. At the next line below, add date.readInput();
3. Run the program again. Fix any problems you may encouter along the way.

4. At the last line of your program, add System.out.println(date.month);
and see what happens. Why?



因為宣告month時是用private來宣告，只可以在DateFirstTry這個class使用

lab class definition

Study Display 4.1 and then do Self-Test Exercise 1.

lab counter

Define a class called Counter whose objects count things. An object of this class records a count that is a nonnegative integer. Include methods to set the counter to 0, to increase the count by 1, and to decrease the count by 1. Include an accessor method that returns the current count value and a method that outputs the count to the screen. Write a program to test


counter.reset();
counter.inc();
counter.inc();
counter.dec();
counter.output();

Homework: 3/23/2009

Write a program to calculate average income by gender based on the following data, where F stands for female and M for male.

F 62,000
M 25,000
F 38,000
F 43,000
M 65,000
M 120,000
F 80,000
M 30,100

You should be able to allow users to type in a whole line such as F 80,000 followed by next line M 30,100.

Lab Cosine

Write a Java program to calculate the triangular function as follows:
Cos(x)=1 - x 2 /2!+ x 4/4!- x 6/ 6!...

Lab Fibonacci

List the first 100 numbers and the ratio of
a number to its previous number, such as 1/1 = 1, 2/1 = 2, 3/2 = 1·5, 5/3 = 1·666..., 8/5 = 1·6, 13/8 = 1·625, 21/13 = 1·61538....

Want to know more about Fibonacci number



結果趨近黃金比例1.618

Homework 3-16-2009

1. Project 7 of Chap. 3

2. Write a program to generate the following table of arithmetic expressions

1*1=1 1*2=2 1*3=3 ... 1*9=9
2*1=2 2*2=4 2*3=6 ... 2*9=19
...
9*1=9 9*2=18 9*3=27 ... 9*9=81

Lab Finding the max of a list of numbers

Based on your study of Display 3.8, write a code to find the max and min of a list of number.
For example, given 1,3,5, and9, the max is 9 and the min is 1.
Your program should be able to process a list of any length.

Lab Finding the max of three numbers

Write a program to decide the max number of the three input number.

Lab Tax Calculation

Study Display 3.1. Based on the income tax rate in Taiwan,
calculate the income tax of a person whose annual income is 1,000,000 or 2,000,000.

Homework 3-9-2009

1. Do Project 4 in Chapter 2

2. Do Project 5 in Chapter 2

3. Do Project 6, in Chapter 2

4. Do Project 7, in Chapter 2

Lab Keyboard precessing

Project 3 of Chap. 2.

Lab Keyboard Input

Rewrite Display 2.6 using BufferedReader.

You need to import the following packages in the first place.

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

Change

Scanner keyboard= new Scanner(System.in);

into

BufferedReader keyboard= new BufferedReader(new InputStreamReader(System.in));

String inputString = keyboard.readLine();

Note the Main method needs IOException handling as follows:

public static void main (String[] args) throws IOException

Lab Scanner

Do Display 2.6.

What is ASCII?

Homework 3-2-2009

1. Write a program that can reverse the order of an input string. For example, if you input "ab", it will output "ba". If you input "abcdefg", it should return "gfedcba".



2. Write a program that can print names alternatively. The names are in the format of "First Name + Last Name" or "Last Name, First Name". For example, if you input "Walt Savitch", your program will output "Savitch, Walt". If you input "Savitch, Walt", your program will output "Walt Savitch".

Lab String Processing

Do Project 5 of Chap. 1 on Page 56.

Write a program that starts with a line of text and then outputs that line of text with the first occurrence of "hate" changed to "love". For example, a possible sample output might be

The line of text to be changed is:
I hate you.
I have rephrased that line to read:
I love you.

Hint: You may consider use the methods: indexOf(A_String) and substring(Start, End) in your program.

Lab Java casting

Write a Java program as follows:

Let m=1, n=2;
Print m/n
Print m/ (double)n;
Print (double) m/n;

Lab Java operators

(a) Write a Java program as follows:

Let i=2;
Print i;
Print 2 * (i++);
Print i;

Ans: 2, 4, 3


(b) Write a Java program as follows:

Let i=2;
Print i;
Print 2 * (++i);
Print i;

Ans: 2, 6, 3