Variables and Computing
Java_OverView1
Computer or Computing
  • Data Types:

  • Application structure
    • Class Hello with main() method is the bare minimum requirement of an application.
    • main() method here is an entry point of an application, Java won't compile if an application has more than one main() method.
  • Java runs in a Virtual Machine
  • Variable initiation or assignment with with values.
    String str1 ="ABCD"; int n1 = 20;
  • Operators

    • Unary Operators: unary operators require only one operand.
      • n1 .= +2,
      • n1 = -2
      • n1 = n2++,
      • n1 = n2--,
      • b1 = (!notfalse)
    • Conditional  Operator :
      • equal to = = ;
      • not equal to !=
      • greater than >
      • less than <
      • greater than or equal to >=
      • less than or equal to <=
    • Bit wise and Bit shift operators
      •  ~ unarray bit wise complement