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Post on 11-Jun-2020
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Primitive Data Types in Java Programming Language
• Each Variable in Java must have certain type associated with it which tells us what kind of data a variable can store.
• Data Types in Java Programming Language are classified into two main groups – Primitive and Reference Data Types.
Primitive Data Types are:• Data types are predefined by the Java language.
• Predefined data types are Java Reserved keyword
• They cannot be used as variable name inside program/application
• Primitive values do not share state with other primitive values.
• Total Number of Primitive Data Types in Java Programming is 8
Primitive Data Types in Java :
boolean char byte int
short long float double
Type Contains Default Size
boolean true or false false 1 bit
char Unicode Character u0000 16 bits
byte Signed Integer 0 8 bits
short Signed Integer 0 16 bits
int Signed Integer 0 32 bits
long Signed Integer 0 64 bits
float Floating Number 0.0 32 bit
double Floating Number 0.0 64 bit
Data Types in Java :
Live Example : Declaring Integer Variable in Java Programming
• Primitive Variable can be declared using “int” keyword.• Though Integer contain default Initial Value as 0 , still we have to assign 0 to
show assignment in Java.• “+” operator is used to concatenate 2 strings.
• Example "Java" + "Programming" will produce "JavaProgramming".
• Integer is converted into String internally and then two strings are concatenated.
Practice• public static void main(String[] args) {
• String longStr = "This could have been " +
• "a very long line that would have " +
• "wrapped around. But string concatenation " +
• "prevents this.";
• System.out.println(longStr);
• }
• }
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