1.Class Name: DegreeConverter.
import java.util.*;
class DegreeConverter {
public static void main(String[] args) {
float temperature;
double c,f;
Scanner in = new Scanner(System.in);
System.out.println("Enter temperatue in Fahrenheit");
f = in.nextDouble();
c = ( f-32)/1.8;
System.out.println("Temperature in Celsius = " + c);
}
}
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2. Class CurrencyConverter
import java.util.*;
public class CurrencyConverter {
public static void main(String[] args) {
double USD=43.75, GBP=78.98, EUR=56.45, JPY=0.867;
double USDmoney=0,GBPmoney=0,EURmoney=0,JPYmoney=0;
int Pmoney;
Scanner in = new Scanner(System.in);
System.out.println("Enter currency:");
Pmoney = in.nextInt();
USDmoney = Pmoney* USD;
GBPmoney = Pmoney * GBP;
EURmoney = Pmoney * EUR;
JPYmoney = Pmoney* JPY;
System.out.println("Peso to USD:" + USDmoney + "\n Peso to GBP:" + GBP + "\nPeso to EUR:" +
EURmoney + "\n Peso to JPY:" + JPYmoney);
}
}
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3. Class Name: Pay.
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4. Class Name: MileAge
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5.Class Name: Quadratic
import java.util.*;
public class Quadratic {
public static void main(String[] args) {
Scanner console = new Scanner (System.in);
double a , b , c , d , r , rr, sq ;
System.out.println("Please enter the value of a:");
a = console.nextDouble();
System.out.println("Please enter the value of b:");
b = console.nextDouble();
System.out.println("Please enter the value of c:");
c = console.nextDouble();
d = ((b * 2) - 4) * (a * c);
r = -b / (2 * a);
rr=(-b+d) / (2*a);
System.out.println("The Quadratic answer is: " + d);
if ( d < 0){
System.out.println("No root available");}
else if ( d == 0){
System.out.println("Roots are equal");
System.out.println("The answer for the roots is: " + r);}
else if (d > 0){
System.out.println("The Displayed answer is:" + rr );}
else
System.out.println("Invalid");
System.exit(0);
}
}
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6. Class EvenNum.
public class EvenNum {
public static void main(String[] args)
{
//FOR LOOP
System.out.println("------------ using for loop ------------");
for (int a=2; a<=50; a++)
{
System.out.print(a+" ");
a=a+1;
};
//WHILE LOOP
System.out.println(" ");
System.out.println("------------ using while loop ------------");
int a = 2;
while(a<=50)
{
System.out.print(a+" ");
a=a+2;
};
//DO..WHILE LOOP
System.out.println(" ");
System.out.println("------------ using do...while loop ------------");
int x = 2;
do
{
System.out.print(x+" ");
x=x+2;
}
while(x<=50);
}
}
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7. Class Sumof50
public class Sumof50 {
public static void main(String[] args) {
int sum = 0;
for (int i=1; i<=50; i++)
{
sum = i+sum;
};
System.out.println("Sum numbers from 1-50: " + sum);
}
}
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8. Class name is TableOfSquares.
public class TableOfSquares {
public static void main(String[] args) {
//for loop
System.out.println("----- Using for loop -----");
for(int a=1; a<=20;a++)
{
System.out.println();
System.out.print("Number: " + a + "\tSquare: " + (a*a) );
};
System.out.println(" " + "\n" + "\n");
//WHILE LOOP
int x=1;
System.out.println("----- Using while loop -----");
while(x<=20)
{
System.out.println();
System.out.print("Number: " + x + "\tSquare: " + (x*x) );
x++;
};
System.out.println(" " + "\n" + "\n");
//DO..WHILE LOOP
int a=1;
System.out.println("----- Using do..while loop -----");
do{System.out.println();
System.out.print("Number: " + a + "\tSquare: " + (a*a) );
a++;}
while (a<=20);
}
}
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9. Class Name: NameValidation
import java.util.Scanner;
public class NameValidation {
public static void main(String[] args) {
Scanner s= new Scanner(System.in);
String word;
int lastletter;
do{
System.out.print("Enter a word: ");
word = s.next();
lastletter = word.length()-1;
if (word.equals("exit")){
System.out.println("Program is now terminating…");
break;
}
else if (word.charAt(lastletter)==word.charAt(0))
System.out.println("The first character is EQUAL to its last character: "+word);
else
System.out.println("The first character is NOT EQUAL to its last character: "+word);
}
while (word != null);
}
}
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10. Class Name: Prime
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*************************JAVA BASICS : Using JOptionPane Class*****************
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11. Class Name MonthBalance
import javax.swing.JOptionPane;
public class MonthBalance {
public static void main(String[] args) {
String choice="element";
String Menu="\nd-Deposit \nw-Withdrawal \ne-Exit";
String Choice="element";
double balance = 0,d=0;
double yearlyRate=0.025,w=0;
do{
choice=JOptionPane.showInputDialog(Menu+"\n Enter Choice:");
choice=choice.toLowerCase();
switch(choice.charAt(0) ){
case 'd':
JOptionPane.showMessageDialog(null,"Beginning of Month Balance:" + balance);
balance=Double.parseDouble(JOptionPane.showInputDialog("enter Deposit"));
JOptionPane.showMessageDialog(null,"Beginning of Month Balance:" + balance);
break;
case 'w':
JOptionPane.showMessageDialog(null,"Beginning of Month Balance:"+balance);
w=Double.parseDouble(JOptionPane.showInputDialog("Enter withdrawal amount:"));
balance = balance+(yearlyRate / 12) * balance;
JOptionPane.showMessageDialog(null,"Balance after transaction:"+ (balance=balance-w));
break;
case 'e': System.exit(0);
break;
default:JOptionPane.showMessageDialog(null,"Access Denied!");
}
}while(choice.charAt(0)!=('e'));
}
}
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12. Class Name CharacterorString
import java.util.*;
import javax.swing.JOptionPane;
import javax.swing.JOptionPane;
public class CharacterorString{
public static void main(String[] Theory)
{
String SentenceContents=JOptionPane.showInputDialog("Enter a string:" );
int VowelCount = 0,ConsonantCount = 0,WordCount = 0,SpaceCount = 0,SpecialCharCount = 0 ;
for (int Bat = 0; Bat < SentenceContents.length(); Bat++)
{
char Vowels = SentenceContents.charAt(Bat );
if ( (Vowels == 'A') || (Vowels == 'a' )
|| (Vowels == 'E') || (Vowels == 'e' )
|| (Vowels == 'I') || (Vowels == 'i' )
|| (Vowels == 'O') || (Vowels == 'o' )
|| (Vowels == 'U') || (Vowels == 'u' ))
VowelCount++;
char Consonants = SentenceContents.charAt(Bat);
if ( (Consonants == 'B') || (Consonants == 'b')
|| (Consonants == 'C') || (Consonants == 'c')
|| (Consonants == 'D') || (Consonants == 'd')
|| (Consonants == 'F') || (Consonants == 'f')
|| (Consonants == 'G') || (Consonants == 'g')
|| (Consonants == 'H') || (Consonants == 'h')
|| (Consonants == 'J') || (Consonants == 'j')
|| (Consonants == 'K') || (Consonants == 'k')
|| (Consonants == 'L') || (Consonants == 'l')
|| (Consonants == 'M') || (Consonants == 'm')
|| (Consonants == 'N') || (Consonants == 'n')
|| (Consonants == 'P') || (Consonants == 'p')
|| (Consonants == 'Q') || (Consonants == 'q')
|| (Consonants == 'R') || (Consonants == 'r')
|| (Consonants == 'S') || (Consonants == 's')
|| (Consonants == 'T') || (Consonants == 't')
|| (Consonants == 'V') || (Consonants == 'v')
|| (Consonants == 'W') || (Consonants == 'w')
|| (Consonants == 'X') || (Consonants == 'x')
|| (Consonants == 'Y') || (Consonants == 'y')
|| (Consonants == 'Z') || (Consonants == 'z') )
ConsonantCount++;
char Spaces = SentenceContents.charAt(Bat);
if ( (Spaces == ' ') )
SpaceCount++;
char SpecialCharacters = SentenceContents.charAt(Bat);
if ( (SpecialCharacters == '!') || (SpecialCharacters == '@' )
|| (SpecialCharacters == '#') || (SpecialCharacters == '$' )
|| (SpecialCharacters == '%') || (SpecialCharacters == '^' )
|| (SpecialCharacters == '&') || (SpecialCharacters == '*' )
|| (SpecialCharacters == '(') || (SpecialCharacters == ')' )
|| (SpecialCharacters == '-') || (SpecialCharacters == '_' )
|| (SpecialCharacters == '+') || (SpecialCharacters == '=' )
|| (SpecialCharacters == ',') || (SpecialCharacters == '<' )
|| (SpecialCharacters == '.') || (SpecialCharacters == '>' )
|| (SpecialCharacters == '?') || (SpecialCharacters == '/' )
|| (SpecialCharacters == '"') || (SpecialCharacters == ';' )
|| (SpecialCharacters == ':') || (SpecialCharacters == '{' )
|| (SpecialCharacters == '[') || (SpecialCharacters == '}' )
|| (SpecialCharacters == ']') || (SpecialCharacters == '~' )
|| (SpecialCharacters == '`') || ((SpecialCharacters == '1' )
|| (SpecialCharacters == '2') || (SpecialCharacters == '3' )
|| (SpecialCharacters == '4') || (SpecialCharacters == '5' )
|| (SpecialCharacters == '6') || (SpecialCharacters == '7' )
|| (SpecialCharacters == '8') || (SpecialCharacters == '9' )
|| (SpecialCharacters == '|') ))
SpecialCharCount++;
String done="";
char Terminate = SentenceContents.charAt(Bat);
if (Terminate == 'd')
JOptionPane.showMessageDialog(null,"the System is terminating");
if ( SentenceContents != null)
{
}
}
JOptionPane.showMessageDialog(null,
"There are " + VowelCount + " vowels in this sentence\n"+
"There are " + ConsonantCount + " consonants in this sentence\n"+
"There are " + SpaceCount + " spaces in this sentence\n" +
"There are " + SpecialCharCount + " special characters in this sentence" );
}
}
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13.
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14.
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15.
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16. Class Name Reverse
import java.io.*;
public class Reverse {
public static void main(String[] args)throws Exception
{
BufferedReader fb=new BufferedReader(new InputStreamReader(System.in));
System.out.print("enter string");
String name=fb.readLine();
String reverse=new StringBuffer(name).reverse().toString();
System.out.print("the reverse string is:"+reverse);
}
}
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17.
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