Java 10 local variable type inference feature.

Java10DataTypes.java

package com.java9r;

import java.util.Date;

public class Java10DataTypes {

 public static void main(String[] args) {
  
  var n= "java9r";// String declaring
  
  var a ='J'; // char declaring character

  var i = 90; // int - Integer data type is generally used for numeric values

  var b = 0b11001000; // byte - use byte and short if memory is a constraint
  var  b2 = (byte) 320; //

  // byte b1 = 789654258; // this will give error as number is larger than byte range

  var s = 58; // short
  
  var s2 = (short)58; // short

  // short s1 = 789654258; this will give error as number is larger than short range

  var d = 4.789654258; // double - by default fraction value is double in java

  var f = 4.7896354f; // float - for float use 'f' as suffix
  
  var l = 3200L; //long for long use 'l' as suffix
  
  var bool=true; // declaring boolean 
  
  var date=new Date(); // declaring date 
  
  System.out.println("String : " + n);
  System.out.println("char : " + a);
  System.out.println("integer : " + i);
  System.out.println("byte : " + b);
  System.out.println("byte 2 : " + b2);
  System.out.println("short : " + s);
  System.out.println("short 2 : " + s2);
  System.out.println("float : " + f);
  System.out.println("double : " + d);
  System.out.println("long : " + l);
  System.out.println("bool : " + bool);
  System.out.println("date : " + date);

 }

}

 

Output

String : java9r
char : J
integer : 90
byte : 200
byte 2 : 64
short : 58
short 2 : 58
float : 4.789635
double : 4.789654258
long : 3200
boolean : true
date : Wed Aug 29 11:33:26 PDT 2018