• In an object-oriented language, all data should be encapsulated as objects.

  • However this is cumbersome.
  • Also not intuitive for users of other programming languages like C , C++ to transition to Java.

• Java has 8 primitive scalar types:

  • int,long,short,byte
  • float,double
  • char
  • boolean

• Size of each type is fixed in JVM

  

• Double quotes denotes Strings.
• Boolean constants are true and false
• Append f after number for float, else interpreted as double.

• No Separate integer division operator //.
  • When both arguments are integer , / is integer division.
    • Converts the integer to float automatically in this process. (Not sure).

• No exponentiation operator, use Math.pow(a,n) → $a^n$

Strings

• String is a built in class.

String s,t;

• String constants enclosed in double quotes

String s="Hello", t="World";

• + is overloaded for concatenation of Strings

String s = "Hello";
String t = "World";
String u = s + " " + t;

• Strings are not array of characters
  • So cannot write s[3]='p' or s[4]='!'