Java - Java variable and its size

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  4. Check default value of variable by types

Introduction

A Java variable is a piece of memory that can contain a data value.

Demo

public class Variables2 {

  public static void main(String[] args) {
    /*//from  w w w . jav  a  2s  . co m
     * Byte Min: -128 Max: 127 Default: 0
     */
    byte myByte;
    myByte = 120;
    @SuppressWarnings("unused")
    byte myByte1 = 100;
    System.out.println("1.Byte Value: " + myByte); /*
                                                    * Short Min: -32,768 Max: 32,767 Default: 0
                                                    */
    short myShort = 10000;
    System.out.println("Short Value: " + myShort);

    /*
     * int Min: -2,147,483,648 Max: 2,147,483,647 Default: 0
     */
    // declare and assign variable
    int num1;
    num1 = 122;

    int MyInt = 1000000;
    System.out.println("Int Value: " + MyInt);
    /*
     * long Min: -2^63 Max: 2^63 -1 Default: 0
     */
    long myLong = 100000000000000000L;
    System.out.println("Long Value: " + myLong);

    /*
     * float Default: 0.0f
     */
    float myFloat = 20.0f;
    System.out.println("Float Value: " + myFloat);

    /*
     * double Default: 0.0d
     */
    double myDouble = 21.0;
    System.out.println("Double Value: " + myDouble);

    /*
     * boolean false and true Default: false
     */
    boolean myBoolean = true;
    System.out.println("Boolean Value: " + myBoolean);

    /*
     * char Min: 0 Max: 65,535
     */
    char myChar = 'a';
    System.out.println("Char Value: " + myChar);
    String mysting = "welcome to java";
    System.out.println("String value Value: " + mysting);
  }
}

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