Performing Tasks 

Input:

      String myString;
      int myInt;

      myString = JOptionPane.showInputDialog(null,"Enter an integer");
      myInt = Integer.parseInt(myString);

Output: 
 
      int myInt = 5;

      JOptionPane.showMessageDialog(null,"MyInteger = " + myInt);
 
                  or

      System.out.println("MyInteger = " + myInt);


Arithmetic and Computation:

      x+y           Math.pow(a,b)
      x-y           Math.sin(Math.PI/2.0)
      x*y
      x/y
      x%y

Conditionals

      if (boolean exp) statement block
   
                 or

      if (boolean exp) statement block1 else statement block2

                 or

      switch (integer-valued expression) 
        {
           case int1: statement block 1

           case int2: statement block 2             
  
                    ...

           default: default statement block
        }

Loops

      while (boolean expression)
        statement block

               or

      do 
         statement block

      while (boolean expression)

              or

      for (i= istart; i<iend; i++)
         statement block
         

Encapsulating into a class

     import someClassLibrary

     class myClass {

           static int myVar1;
           public int myVar2;
           private double myVar3;

           public myClass()         // Constructor
              statement block
 
           public myClass(int x)    // Another Constructor
              statement block

           public myMethod1(double x)
              statement block
 
           private myMethod2(int x, double y)
              statement block
        }