Field Variables are variables that are declared as members of classes. : Member Variable « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » Member Variable 
1.20.1.Field Variables are variables that are declared as members of classes.
A member variable is created when a class instance is created, 
and it is destroyed when the object is destroyed. 

public class MainClass {
  private int fieldVariable;

  public static void main(String[] argv) {
    System.out.println();
  }
}
1.20.Member Variable
1.20.1.Field Variables are variables that are declared as members of classes.
1.20.2.Field variables are declared using the following syntax: modifiers Type declarator;
1.20.3.Java supports two different kinds of variables: field variables and local variables.
1.20.4.Field variables of object types and the elements of arrays of object types are automatically initialized to the null value.
1.20.5.Initialization Values for Member Variables(the same as array element initialization values)
1.20.6.Default initializations of static and instance variables.
1.20.7.A member value may be initialized in its own declaration line:
1.20.8.nonstatic instance variables are initialized before the class constructor is executed
1.20.9.Non-initialized string instance variable
1.20.10.Array Instance Variables
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