LAB

public class Fraction {

private int numerator;

private int denominator;

public void number( int numerator, int denominator)

{

this.numerator = numerator; //把這method的區域變數numerator給予這個類別內宣告的numerator

this.denominator = denominator; //this:代表使用中的類別,也可以使用在變數名稱有重複或易於混淆時

}

public String outputstring() {

return (numerator + "/" + denominator);  //分數的表示形式

}

public boolean equal(Fraction Fraction2)

{

if(numerator*Fraction2.denominator == denominator*Fraction2.numerator)

{

return true;

}

else

{

return false;

}

}

public static void main(String[] args) 

{

Fraction f1 = new Fraction();

Fraction f2 = new Fraction();

f1.number(1, 2);

f2.number(2, 4);

System.out.println("f1 = " + f1.outputstring() + "\nf2 = " + f2.outputstring());

//System.out.println("f1 + f2 = "+ f1.add(f2).outputstring());

System.out.println(f1.equal(f2));

}

}

LAB

public class Fraction {

private int numerator;

private int denominator;

public void number( int numerator, int denominator)

{

this.numerator = numerator; //把這method的區域變數numerator給予這個類別內宣告的numerator

this.denominator = denominator; //this:代表使用中的類別,也可以使用在變數名稱有重複或易於混淆時

}

public String outputstring() {

return (numerator + "/" + denominator);  //分數的表示形式

}

public Fraction add(Fraction Fraction2) //add中有2個Fraction相加，Fraction Fraction2

{                                       //為Fraction.add(Fraction)表示方式並為區隔而寫為Fraction2

Fraction countOfTemp = new Fraction();

countOfTemp.numerator = numerator*Fraction2.denominator + denominator*Fraction2.numerator;

countOfTemp.denominator = denominator*Fraction2.denominator;

//交叉相乘

return countOfTemp; 

}

public static void main(String[] args) 

{

Fraction f1 = new Fraction();

Fraction f2 = new Fraction();

f1.number(1, 2);

f2.number(1, 3);

System.out.println("f1 = " + f1.outputstring() + "\nf2 = " + f2.outputstring());

System.out.println("f1 + f2 = "+ f1.add(f2).outputstring());

 

}

}

HOMEWORK

/*
* Counter.java
*
* Created on 2009年4月12日, 下午 11:01
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/

package javaapplication16;

/**
*
* @author KFN
*/
public class Counter {
private int counter;

void reset()
{
counter = 0;
}

void inc()
{
++counter;
}

void dec()
{
--counter;
}

int getcounter()
{
return counter;
}

void output()
{
System.out.println(counter);
}
/** Creates a new instance of Counter */
public Counter() {
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Counter counter = new Counter();

counter.reset();
counter.inc();
counter.inc();
counter.inc(); //作為測試多做了2個加
counter.inc();
counter.dec();
counter.output();
// TODO code application logic here
}

}

MEMO

public class DateFirstTry {

public String month;

public int day;

public int year;

public void makeItNewYears()

{

month = "January";

day = 1;

}

public void writeOutput()

{

System.out.println(month + " " + day + ", " + year);

}

}

------------

public class ch4 {

public static void main (String[] args)

{

DateFirstTry date1, date2;

date1 = new DateFirstTry();

date2 = new DateFirstTry();

date1.month = "January";

date1.day = 1;

date1.year = 2007;

System.out.println("date1:");

date1.writeOutput();

date2.month = "July";

date2.day = 4;

date2.year = 1776;

System.out.println("date2:");

date2.writeOutput();

System.out.println("Make It In New Years:");

date2.makeItNewYears();

date2.writeOutput();

}

}