public static void main(String[] args) 
{
double num1, num2; 
double max;
num1 = 250.57; 
num2 = 112.0;
if (num1>=num2)
   max = num1;
else
   max = num2;
System.out.println("Larger: "+max);
}

Data types:

 int

 double

 char

 String

 boolean


boolean flag;
flag = positive(x);
System.out.println("number is positive: "+flag);
                             number is positive: True
                             

if (positive(x))
   System.out.println("number is positive");
else
   System.out.println("number is not positive");

public class Number
{
  public static boolean positive (int x)
  {
   return (x>0)? true : false;
  }

{
 if (x>0)
  return true;
 else
  return false;
 }  
 
 public static boolean oddeven (int x)
 {
   if (x%2==0)      (x%2!=0)
     return true;
   else        return false;
 }
  public static void main (String [] args)
  {
    int x;
    System.out.println("Enter an integer");
    x = Integer.parseInt(stdin.readline());
    
    if (positive(x))
    
    if (oddeven(x))
        System.out.print("Odd number");   
    else      System.out.print("even number");



public class Problem2
{ 
  public static int sum(int x, int y)
  {  int z;  z = x+y;   return z; }
  {  return x+y; }
  public static double sum(int x, double y)
  {  return x+y; }
  public static double sum(double x, int y)
  {  return x+y; }
  public static double sum(double x, double y)
  {  return x+y; }
 
  public static void main (String [] args)
  {
    int x1, x2;
    double y1,y2;
    System.out.println("first sum = "+sum(x1,x2);
    int z = sum (x1,x2);
    System.out.println("2nd sum = "+sum(x1,y1);
    System.out.println("3rd sum = "+sum(y2,x2);
    System.out.println("4th sum = "+sum(y1,y2);
  }


int sum = 0;
for(int i = 1; i<=10; i++)  i+=5
{
 sum += i;
}

int sum = 0;
int i = 1;
while (i<=10)
{
  sum+=i;
  i++;
}

int sum = 0;
int i = 1;
do
{
  sum+=i;
  i++;
}
while (i<=10);



Example
In a market, a discount is made on a purchase as follows:
-If purchase ≤ 1000, there is no discount.
-If 1000 < purchase ≤ 2000, a discount 5% on the amount above 1000.
-If purchase > 2000, discount = 50 + 7.5% of the amount above 2000
Write a Java program that reads the purchase amount and calculates the money paid.

public class Market
{
   public static void main (String [] args)
  {
    double purs, disc, paid;
    purs = 3200;
    System.out.println("Please enter purchase amount");
    purs = Double.parseDouble(stdin.readline());
    if (purs<=1000)
         disc = 0;
    else if (purs<=2000)
         disc = .05*(purs-1000);
    else 
         disc = 50 + .075*(purs-2000);
    paid = purs - disc;
    System.out.println("paid amount = "+paid);
}


*
* * *
* * * * *
* * * * * * *

class Stars
{
   public static void main (String [] args)
  {
    int i, j;
    for (i = 1; i<=7; i+=2)
    {
      System.out.println();
      for(j=1; j<=i; j++)
           System.out.print("* ");
    }
}
i = 1    ln  j=1                   * 
i = 3    ln  j=1,2,3              * * *