Temperature Conversion

import java.io.* ;
public class Temperature
{
      public static void fahToCelsius(double tempF)

      { 

      double tempC = (tempF - 32)/1.8 ;
      System.out.println("Temperature in Celsius is" + tempC) ;
      }
      public static void celToFahrenheit(double tempC 
      {

        double tempF = (tempC * 1.8) + 32 ;
 System.out.println("Temperature in Fahrenheit is" + tempF) ;
      }
 public static void main(String[ ] args)
      { System.out.println("1. Fahrenheit to Calcius") ;
 System.out.println("2. Celcius to Fahrenheit") ;
 System.out.println("Enter you choice") ;
 int ch = 0 ;
 DataInputStream in = new DataInputStream(System.in) ;
 double tmp ;
 System.out.println("Enter temperature to be converted") ;
      {

        if (ch == 1)
  fahToCelsius(tmp);
 else
  celToFahrenheit(tmp;

     }
}

Area of Circle

public class Circle 
{
    public static void main(double radius)
 {
  double area ;
  area = 22/7 * (radius * radius);
  System.out.println("Area of circle is " + area);
 }
}

Example of Function Overloading

class Overload
{
    void compare( int a, int b)

    {
        if (a >b)
            System.out.println(a);
        else if (b > a)
            System.out.println(b);
    }  
    void compare(char ch1, char ch2) 

    {
        if ( (int) ch1 > (int)ch2) 
            System.out.println(ch1);
        else
            System.out.println(ch2);
    }    
    void compare( String s1, String s2) 

    {
        if( s1.length() >s2.length()  )
            System.out.println(s1);
        else
            System.out.println(s2);
    }
}

Volume of various solids

class Volume { double VOLUMEofCUBE (double side) { return side*side*side; } double VOLUMEofSPHERE (double radius) { return 4.0/3*22/7*radius*radius*radius; } double VOLUMEofCUBOID(double l, double b, double h) { return l*b*h; } double VOLUMEofCYLINDER(double radius, double height) { return 22/7*radius*radius*height; } double VOLUMEofCONE(double radius, double height) { return 1/3*22/7*radius*radius*height; } }

To check that the given number is EVEN or ODD

class EVENorODD
{  
   public void main(int n) //accepts an integer named n  
   {
      if(n % 2 == 0)
      System.out.println("You entered an even number."); 
      else    
      System.out.println("You entered an odd number."); 
   }
}

Maximum of 2 numbers

class MaxOf2Num
{
  public void main(String args[ ])
  {
     int Num1 =7, Num2 = 3, result;
     if(Num1 > Num2)
     result=Num1;
     else
     result=Num2;
     System.out.println(result);
  }
}

Minimum of 2 numbers

class MinOf2Num
{
  public void main(String args[ ])
   {
      int Num1 =7, Num2 = 3, result;
      if(Num1 < Num2)
      result=Num1;
      else
      result=Num2;
      System.out.println(result);
   }
}