tower

import java.io.*;
public class Tower
{
public static void Tower(int n,char frompg,char topg,char auxpg)
{
if(n==1)
System.out.println("Move disc 1 "+frompg+" --> "+topg);
else
{
Tower(n-1,frompg,auxpg,topg);
System.out.println("Move disc "+n+" "+frompg+" --> "+topg);
Tower(n-1,auxpg,topg,frompg);
}
}
public static void main(String[] args)throws IOException
{
int n;
BufferedReader keyboard =new BufferedReader(new InputStreamReader(System.in));
System.out.println("請輸入n個tower:");
n=Integer.parseInt(keyboard.readLine());
char X='X',Y='Y',Z='Z';
if(n==0)
System.out.println("請重新輸入");
else
Tower(n,X,Y,Z);
}
}

Recursion

lab-0102

import java.io.*;
public class lab_0102 {
public static void main(String args[]) throws IOException {
double[] num = new double[5];
int a, b;
double temp;
System.out.println("Enter some number:");
for (a = 0; a <>
BufferedReader input = new BufferedReader(new InputStreamReader(
System.in));
num[a] = Integer.parseInt(input.readLine());
}
for (a = 0; a <>
for (b = 0; b <>
if (num[a] > num[b]) {
temp = num[a];
num[a] = num[b];
num[b] = temp;
}
}
}
for (a = 0; a <>
System.out.print("" + num[a] + " ");
}
System.out.println("");
System.out.println("Largest to Smallest.");
System.exit(0);
}
}

lab_2

測試結果

Lab 12-26-2005 (1)

Homework 12.19.2005

public class EqualArrays {
public static void main(String[] args) {
int[] a = {1, 9, 6, 4, 0, 2, 1, 2};
int[] b = {1, 9, 6, 4, 0, 2, 1, 2};
System.out.println("a=1,9,6,4,0,2,1,2");
System.out.println("b=1,9,6,4,0,2,1,2");
if (equalArrays(a, b)) {
System.out.println("a and b are equal ");
} else {
System.out.println("a and b are not equal ");
}
}
public static boolean equalArrays(int a[], int b[]) {
if (a.length != b.length) {
return false;
} else {
int i = 0;
while (i <>
if (a[i] != b[i]) {
return false;
}
i++;
}
}
return true;
}
}

dis6_1

複數相加

結果

Homework 12-12-2005 Counter II

package javacode2;

public class Counter
{
public Counter()
{
count = 0;
}

public void increase()
{
count++;
}

public void decrease()
{
if(count >=1)
count--;
else
count = 0;
}

public int getVasue()
{
return count;
}

public void printcount()
{
System.out.println("counter count is " + count);
}

public boolean equals(Counter otherCounter)
{
return this.count == otherCounter.count;
}

public void resetToZero()
{
count = 0;
}

public String toString()
{
return Integer.toString(count) ;
}





package javacode2;

class CounterTest
{
public static void main(String[] args)
{
Counter counter1 = new Counter();
Counter counter2 = new Counter();

counter1.increase();
counter2.increase();

if (counter1.equals(counter2))
{
System.out.println( counter1 + " is equal to " + counter2);
}
else
{
System.out.println( counter1 + " is not equal to " + counter2);
}

counter2.increase();
counter1.decrease();
if (counter1.equals(counter2))
{
System.out.println( counter1 + " is equal to " + counter2);
}
else
{
System.out.println( counter1 + " is not equal to " + counter2);
}
}
}

Lab 12-12

public class Fibonacci {
public static double n0 = 1, n1 = 1, sum = 0;
public static double next() {
sum = n0 + n1;
n0 = n1;
n1 = sum;
return sum;
}

public static void main(String[] args) {
for (int i = 0; i <>
Fibonacci.next();
System.out.println("F(" + (i + 2) + ") = " + sum);
}
}
}

Homework 12-5-2005

package bbb;
public class temperature
{
private double degree;
private char scale;

public temperature()
{
this.degree=0;
this.scale='c';
}
public temperature(double degree)
{
this.degree=degree;
this.scale='c';
}
public temperature(char scale)
{
this.degree=0;
if(scale=='f'||scale=='F')
{
this.scale='F';
}
else if(scale=='c'||scale=='C')
{
this.scale='C';
}
else
{
System.out.println("error scale and please scale set C");
this.scale='C';
}
}
public temperature(double degree,char scale)
{
this.degree=degree;
if(scale=='f'||scale=='F')
{
this.scale='F';
}
else if(scale=='c'||scale=='C')
{
this.scale='C';
}
else
{
System.out.println("error scale and please scale set C");
this.scale='C';
}
}
public double get_temperatureC()
{
double degreesC=0;
if(scale=='C')
{
degreesC=degree;
}
else if(scale=='F')
{
degreesC = (degree -32 )*5/9;
}
return degreesC;
}
public double get_temperatureF()
{
double degreesF=0;
if(scale=='F')
{
degreesF=degree;
}
else if(scale=='C')
{
degreesF = (degree *9/5 )+32;
}
return degreesF;
}
public void setdegree(double degree)
{
this.degree=degree;
}
public void setScale(char scale)
{
if(scale=='f'||scale=='f')
{
this.scale='F';
}
else if(scale=='c'||scale=='C')
{
this.scale='C';
}
else
{
System.out.println("Error scale and scale no change");
}
}
public void setScale(double degree,char scale)
{
if(scale=='f'||scale=='f')
{
this.scale='F';
}
else if(scale=='c'||scale=='C')
{
this.scale='C';
}
else
{
System.out.println("Error scale and scale no change");
}
this.degree=degree;
}
public boolean isequals(temperature othertemp)
{
if (this.scale == 'C' && this.degree == othertemp.get_temperatureC())
{
return true;
}
else if (this.scale == 'F' && this.degree == othertemp.get_temperatureF())
{
return true;
}
else
{
return false;
}
}
public boolean isgreaterthan(temperature otherTemp)
{
if (this.scale == 'C' && this.degree >= otherTemp.get_temperatureC())
{
return true;
}
else if (this.scale == 'F' && this.degree >= otherTemp.get_temperatureF())
{
return true;
}
else
{
return false;
}
}
public boolean islessthan(temperature otherTemp)
{
if (this.scale == 'C' && this.degree <= otherTemp.get_temperatureC())
{
return true;
}
else if (this.scale == 'F' && this.degree <= otherTemp.get_temperatureF())
{
return true;
}
else
{
return false;
}
}

public String toString()
{
return Double.toString(degree) + scale;
}
}


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

package bbb;
public class temperature_b
{
public static void main(String[] args)
{

temperature cloudC = new temperature(0.0, 'C');
temperature cloudF = new temperature(32.0, 'F');
temperature hotC = new temperature(100.0);
hotC.setScale('C');
temperature hotF = new temperature(212.0);
hotF.setScale('F');

temperature degreeC = new temperature();
degreeC.setScale(-40.0, 'C');
temperature degreeF = new temperature();
degreeF.setScale('F');
degreeF.setdegree( -40.0);

System.out.println("cloudC = " + cloudC );
System.out.println("cloudF = " + cloudF );
System.out.println("hotC = " + hotC );
System.out.println("hotF = " + hotF );
System.out.println("degreeC = " + degreeC + " , " + degreeC.get_temperatureF() + "F");
System.out.println("degreeF = " + degreeF + " , " + degreeF.get_temperatureC() + "C");

System.out.print("Test isequals");
System.out.println(cloudC + " = " + degreeC + " ? " + cloudC.isequals(degreeC));
System.out.println(cloudC + " = " + cloudF + " ? " + cloudC.isequals(cloudF));
System.out.println(cloudF + " = " + degreeC + " ? " + cloudF.isequals(degreeC));
System.out.println(cloudF + " = " + cloudC + " ? " + cloudF.isequals(cloudC));

System.out.print("Test islessthan");
System.out.println(cloudC + " <= " + degreeC + " ? " + cloudC.islessthan(degreeC));
System.out.println(cloudC + " <= " + hotF + " ? " + cloudC.islessthan(hotF));
System.out.println(cloudF + " <= " + degreeC + " ? " + cloudF.islessthan(degreeC));
System.out.println(cloudF + " <= " + hotC + " ? " + cloudF.islessthan(hotC));

System.out.print("Test isgreaterthan");
System.out.println(cloudC + " >= " + hotC + " ? " +cloudC.isgreaterthan(hotC));
System.out.println(cloudC + " >= " + degreeF + " ? " + cloudC.isgreaterthan(degreeF));
System.out.println(cloudF + " >= " + hotF + " ? " + cloudF.isgreaterthan(hotF));
System.out.println(cloudF + " >= " + degreeF + " ? " + cloudF.isgreaterthan(degreeF));
}
}

Constructor

package aaaa;
import java.io.*;
public class Date
{
private String month;
private int day;
private int year;

public Date ( )
{
month = "January";
day = 1;
year = 1000;
}

public Date (int monthInt, int day, int year)
{
setDate(monthInt, day, year);
}

public Date (String monthString, int day, int year)
{
setDate(monthString, day, year);
}

public Date (int year)
{
setDate(1, 1, year);
}

public Date (Date aDate)
{
if (aDate == null)
{
System.out.println("Fatal Error.");
System.exit(0);
}
month = aDate.month;
day = aDate.day;
year = aDate.year;
}

public void setDate(int monthInt, int day, int year)
{
if (dateOK(monthInt, day, year))
{
this.month = monthString(monthInt);
this.day = day;
this.year = year;
}
else
{
System.out.println("Fatal Error");
System.exit(0);
}
}

public void setDate(String monthString, int day, int year)
{
if (dateOK(monthString, day, year))
{
this.month = monthString;
this.day = day;
this.year = year;
}
else
{
System.out.println("Fatal Error");
System.exit(0);
}
}

public void setDate(int year)
{
setDate(1, 1, year);
}

public void setYear(int year)
{
if ( (year <> 9999) )
{
System.out.println("Fatal Error");
System.exit(0);
}
else
this.year = year;
}

public void setMonth(int monthNumber)
{
if ((monthNumber <= 0) || (monthNumber > 12))
{
System.out.println("Fatal Error");
System.exit(0);
}
else
month = monthString(monthNumber);
}

public void setDay(int day)
{
if ((day <= 0) || (day > 31))
{
System.out.println("Fatal Error");
System.exit(0);
}
else
this.day = day;
}

public int getMonth( )
{
if (month.equals("January"))
return 1;
else if (month.equals("February"))
return 2;
else if (month.equalsIgnoreCase("March"))
return 3;
else if (month.equalsIgnoreCase("April"))
return 4;
else if (month.equalsIgnoreCase("May"))
return 5;
else if (month.equals("June"))
return 6;
else if (month.equalsIgnoreCase("July"))
return 7;
else if (month.equalsIgnoreCase("August"))
return 8;
else if (month.equalsIgnoreCase("September"))
return 9;
else if (month.equalsIgnoreCase("October"))
return 10;
else if (month.equals("November"))
return 11;
else if (month.equals("December"))
return 12;
else
{
System.out.println("Fatal Error");
System.exit(0);
return 0;
}
}

public int getDay( )
{
return day;
}

public int getYear( )
{
return year;
}

public String toString( )
{
return (month + " " + day + ", " + year);
}

public boolean equals(Date otherDate)
{
return ( (month.equals(otherDate.month)) &&
(day == otherDate.day) && (year == otherDate.year) );
}

public boolean precedes(Date otherDate)
{
return ( (year < year ="="">
(year == otherDate.year && month.equals(otherDate.month) && day <>
}

public void readInput( )throws IOException
{
boolean tryAgain = true;
BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
while (tryAgain)
{
System.out.println("Enter month, day, and year.");
System.out.println("Do not use a comma.");
String monthInput = keyboard.readLine( );
int dayInput = Integer.parseInt(keyboard.readLine());
int yearInput = Integer.parseInt(keyboard.readLine());
if (dateOK(monthInput, dayInput, yearInput) )
{
setDate(monthInput, dayInput, yearInput);
tryAgain = false;
}
else
System.out.println("Illegal date. Reenter input.");
}
}

private boolean dateOK(int monthInt, int dayInt, int yearInt)
{
return ( (monthInt >= 1) && (monthInt <= 12) &&
(dayInt >= 1) && (dayInt <= 31) &&
(yearInt >= 1000) && (yearInt <= 9999) );
}

private boolean dateOK(String monthString, int dayInt, int yearInt)
{
return ( monthOK(monthString) &&
(dayInt >= 1) && (dayInt <= 31) &&
(yearInt >= 1000) && (yearInt <= 9999) );
}

private boolean monthOK(String month)
{
return (month.equals("January") || month.equals("February") ||
month.equals("March") || month.equals("April") ||
month.equals("May") || month.equals("June") ||
month.equals("July") || month.equals("August") ||
month.equals("September") || month.equals("October") ||
month.equals("November") || month.equals("December") );
}

private String monthString(int monthNumber)
{
switch (monthNumber)
{
case 1:
return "January";
case 2:
return "February";
case 3:
return "March";
case 4:
return "April";
case 5:
return "May";
case 6:
return "June";
case 7:
return "July";
case 8:
return "August";
case 9:
return "September";
case 10:
return "October";
case 11:
return "November";
case 12:
return "December";
default:
System.out.println("Fatal Error");
System.exit(0);
return "Error";
}
}
}

-------------------------------------------------------------------------------------------------
package aaaa;

public class dis414
{
public static void main(String[]args)
{
Date date1=new Date("December", 16, 1770),
date2=new Date(1, 27, 1756),
date3=new Date (1882),
date4=new Date ();
System.out.println("Whose birthday is " + date1 + "?");
System.out.println("Whose birthday is " + date2 + "?");
System.out.println("Whose birthday is " + date3 + "?");
System.out.println("The default date is " + date4 + ".");
}
}

DateSixthTry

package bbb;
import java.io.*;
public class DateSixthTry {
private String month;
private int day;
private int year;
public void setDate(int monthInt, int day, int year) {
if (dateOK(monthInt, day, year)) {
this.month = monthString(monthInt);
this.day = day;
this.year = year;
} else {
System.out.println("Fatal Error");
System.exit(0);
}
}
public void setDate(int year) {
setDate(1, 1, year);
}
private boolean dateOK(int monthInt, int dayInt, int yearInt) {
return ((monthInt >= 1) &&amp;amp; (monthInt <= 12) &&
(dayInt >= 1) &&amp;amp; (dayInt <= 31) &&
(yearInt >= 1000) &&amp;amp; (yearInt <= 9999));
}
private boolean dateOK(String monthString, int dayInt, int yearInt) {
return (monthOK(monthString) &&
(dayInt >= 1) &&amp;amp; (dayInt <= 31) &&
(yearInt >= 1000) &&amp;amp; (yearInt <= 9999));
}
private boolean monthOK(String month) {
return (month.equals("January") || month.equals("February") ||
month.equals("March") || month.equals("April") ||
month.equals("May") || month.equals("June") ||
month.equals("July") || month.equals("August") ||
month.equals("September") || month.equals("October") ||
month.equals("November") || month.equals("December"));
}
public String monthString(int monthNumber) {
switch (monthNumber) {
case 1:
return "January";
case 2:
return "February";
case 3:
return "March";
case 4:
return "April";
case 5:
return "May";
case 6:
return "June";
case 7:
return "July";
case 8:
return "August";
case 9:
return "September";
case 10:
return "October";
case 11:
return "November";

case 12:
return "December";
default:
System.out.println("Fatal Error");
System.exit(0);
return "Eorror";
}
}
public void writeOutput() {
System.out.println(month + " " + day + ", " + year);
}
public void setMonth(int month) {
if (dateOK(month, day, year)) {
this.month = monthString(month);
} else {
System.out.println("Fatal Error");
System.exit(0);
}
}
public void setMonth(String month) {
if (dateOK(month, day, year)) {
this.month = month;
} else {
System.out.println("Fatal Error");
System.exit(0);
}
}
}