Automatic Initialization/Default Values for Primitive Types : Primitive Data Types « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Primitive Data Types

Type           Default Value

boolean        false

byte           0

char           \u0000

short          0

int            0

long           0L

float          0.0f

double         0.0d


public class MainClass {
  boolean bo;

  byte by;

  char c;

  short s;

  int i;

  long l;

  float f;

  double d;

  Object o;

  public static void main(String[] args) {
    MainClass app = new MainClass();
    app.run();
  }

  void run() {
    int[] intArray = new int[2];
    Object[] objectArray = new Object[2];
    System.out.println("boolean: " + bo);
    System.out.println("byte: " + by);
    System.out.println("char: " + c);
    System.out.println("short: " + s);
    System.out.println("int: " + i);
    System.out.println("long: " + l);
    System.out.println("float: " + f);
    System.out.println("double: " + d);
    System.out.println("Object: " + o);
    System.out.println("int[2]: " + intArray[0] + " " + intArray[1]);
    System.out.println("Object[2]: " + objectArray[0] + " " + objectArray[1]);
  }
}

boolean: false
byte: 0
char: 
short: 0
int: 0
long: 0
float: 0.0
double: 0.0
Object: null
int[2]: 0 0
Object[2]: null null