Hint: You may study Display 5.14 to get some ideas.
2009年5月25日 星期一
Lab Magic Parking Tower
A parking tower is out of order someday. If you park a Benz, you will end up with a Torben. Write a program to simulate this scenario. First create a class called CarParked which has a static method called outOfOrder. Name an object called yourCar, which happens to be a Benz. Your program should contain a class called CarParked and a test program called CarParkedDemo which test the method by CarParked.outOfOrder(yourCar).
Hint: You may study Display 5.14 to get some ideas.
Hint: You may study Display 5.14 to get some ideas.
2009年5月12日 星期二
Lab Static Method
2009年5月11日 星期一
Lab Math methods
Compute the following mathematical functions.
Math.round(3.2)
Math.round(3.6)
Math.floor(3.2)
Math.floor(3.6)
Math.ceil(3.2)
Math.ceil(3.6)
Math.round(3.2)
Math.round(3.6)
Math.floor(3.2)
Math.floor(3.6)
Math.ceil(3.2)
Math.ceil(3.6)
Homework 5-4-2009
Do Project 7 of Chapter 4
Write a Temperature class that has two instance variables: a temperature value (a floating-point number) and a character for the scale, either C for Celsius or F for Fahrenheit. The class should have four constructor methods: one for each instance variable (assume zero degress if no value is specified and Celsius if no scale is specified), one with two parameters for the two instance variables, and a no-argument constructor (set to zero degrees Celsius).
degreesC = 5 ( degreesF - 32 ) / 9
degreesF = ( 9 ( degreesC ) / 5 ) + 32
＝＞最後跑完結果似乎有點出錯，Ｃ、Ｆ轉換的數據錯誤了。不知道哪裡出了問題，還要再仔細看看。
Write a Temperature class that has two instance variables: a temperature value (a floating-point number) and a character for the scale, either C for Celsius or F for Fahrenheit. The class should have four constructor methods: one for each instance variable (assume zero degress if no value is specified and Celsius if no scale is specified), one with two parameters for the two instance variables, and a no-argument constructor (set to zero degrees Celsius).
degreesC = 5 ( degreesF - 32 ) / 9
degreesF = ( 9 ( degreesC ) / 5 ) + 32
＊結果：
＝＞最後跑完結果似乎有點出錯，Ｃ、Ｆ轉換的數據錯誤了。不知道哪裡出了問題，還要再仔細看看。
2009年5月5日 星期二
Lab Method Overloading
依據Class definition 3，修改程式使其接受三種setDate
date1.setDate(1,2,2008);
date2.setDate("February",2, 2008);
date3.setDate(2008);
date1.setDate(1,2,2008);
date2.setDate("February",2, 2008);
date3.setDate(2008);
2009年5月4日 星期一
Lab Java Constructor
Write constructors in the lab Fraction Addition.
(Fraction)
(Fraction)
(FractionDemo)
=>將原本的程式改寫用"Fraction f1 = new Fraction (1, 2)"的方式
還要記得設定初始值!
Homework 4-27-2009
Do project 2 of Chapter 4.
題目：
Define a class called Fraction. This class is used to represent a ratio of two integers. Include mutator functions that allow the user to set the numerator and the denominator. Also include a member function that returns the value of numerator or denominator as a double. Include an additional member function that output the value of the fraction reduced to lowest terms (e.g., instead of outputting 20/60 the method should output 1/3). This will require finding the greatest common divisor for the numerator and denominator, then dividing both by that number. Embed your class in a test program
題目：
Define a class called Fraction. This class is used to represent a ratio of two integers. Include mutator functions that allow the user to set the numerator and the denominator. Also include a member function that returns the value of numerator or denominator as a double. Include an additional member function that output the value of the fraction reduced to lowest terms (e.g., instead of outputting 20/60 the method should output 1/3). This will require finding the greatest common divisor for the numerator and denominator, then dividing both by that number. Embed your class in a test program
＝＞ 利用最大公因數相除後,可得到分數之最簡化。大致上的方法都相同，都看幾次後就可顯的較容易上手了。
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