Java Variables | Variable in Java programming October 6, 2020October 6, 2020 lifebix variables: syntax: modifers/keywords(optional) datatype variableNameExamplePractice=constantValue; Ex: //integral datatype variables(0) byte one=127; short two=128; int three=900; long four=797987982l; //float(0.0) float five=12.78877f; double six=12.77868768763; //charecters (emptyspac ) char seven=’c’; //boolean (false) boolean eight=true; //String non datatype java.lang package class String nine=”HI”;//null //variables int variableName; Based on position in java programming we have 3 type of variables 1. Local variables 2. Instance variables 3. Static variables 1. Local variables: i)Local Varibles we can declare and intilization method or block ii) Local Varibles don’t have default Values iii) local varibles works within the method or block iV)you need intialize value in local varibles ——————————————————————————————– 2. Instance Varibles: i) the varibles which are declare inside the class or out methods or block that type of varibeles we called as instance Varibles ii)Instance type varibles have default values iii)If youwant use/access instance type of varibles compulorsory you need to create object of your class //Object creation syntax: ClassName refName=new ClassName(); refName.varibleName; class InstanceVariblesExample{ //integral datatype variables(0) byte one; short two; int three; long four; //float(0.0) float five; double six; //charecters (emptyspac ) char seven; //boolean (false) boolean eight; //String non datatype java.lang package class String nine;//null public static void main(String args[]){ //integral InstanceVariblesExample dude=new InstanceVariblesExample(); System.out.println(“Integral Datatype Default Value :: 0”); System.out.println(“byte Default Value :: “+dude.one); System.out.println(“Short Default Value :: “+dude.two); System.out.println(“int Default Value :: “+dude.three); System.out.println(“long Default Value :: “+dude.four); System.out.println(“———————————— “); System.out.println(“Float Datatype Default Value :: 0.0”); System.out.println(“float Default Value :: “+dude.five); System.out.println(“double Default Value :: “+dude.six); System.out.println(“———————————— “); System.out.println(” Char Default Value :: “+dude.seven);// System.out.println(” Boolean Default Value :: “+dude.eight); System.out.println(” String Default Value :: “+dude.nine); } }class InstanceVariblesExample{ //integral datatype variables(0) byte one; short two; int three; long four; //float(0.0) float five; double six; //charecters (emptyspac ) char seven; //boolean (false) boolean eight; //String non datatype java.lang package class String nine;//null public static void main(String args[]){ //integral InstanceVariblesExample dude=new InstanceVariblesExample(); System.out.println(“Integral Datatype Default Value :: 0”); System.out.println(“byte Default Value :: “+dude.one); System.out.println(“Short Default Value :: “+dude.two); System.out.println(“int Default Value :: “+dude.three); System.out.println(“long Default Value :: “+dude.four); System.out.println(“———————————— “); System.out.println(“Float Datatype Default Value :: 0.0”); System.out.println(“float Default Value :: “+dude.five); System.out.println(“double Default Value :: “+dude.six); System.out.println(“———————————— “); System.out.println(” Char Default Value :: “+dude.seven);// System.out.println(” Boolean Default Value :: “+dude.eight); System.out.println(” String Default Value :: “+dude.nine); } } class Example{ int one;//instanc varibels public static void main(String args[]){ int a;//declaration System.out.println(a); Example e=new Example(); sop(e.one); } }