What is a Java String s default initial value

Question

Consider a Java String Field named x  What will be the initial value of x when an object is created for the class x   I know that for int variables  the default value is assigned as 0  as the instances are being created  But what becomes of String

User · Answer

Any object if it is initailised   its defeault value is null  until unless we explicitly provide a default value

User · Answer

It s initialized to null if you do nothing  as are all reference types

User · Answer

That depends  Is it just a variable  in a method   Or a class-member   If it s just a variable you ll get an error that no value has been set when trying to read from it without first assinging it a value   If it s a class-member it will be initialized to null by the VM

User · Answer

There are three types of variables    Instance variables  are always initialized  Static variables  are always initialized  Local variables  must be initialized before use   The default values for instance and static variables are the same and depends on the type    Object type  String  Integer  Boolean and others   initialized with null Primitive types    byte  short  int  long  0 float  double  0 0 boolean  false char    u0000     An array is an Object  So an array instance variable that is declared but no explicitly initialized will have null value  If you declare an int   array as instance variable it will have the null value   Once the array is created all of its elements are assiged with the default type value  For example   private boolean   list     default value is null  private Boolean   list     default value is null   once is initialized   private boolean   list   new boolean 10      all ten elements are assigned to false  private Boolean   list   new Boolean 10      all ten elements are assigned to null  default Object Boolean value

User · Answer

The answer is - it depends   Is the variable an instance variable   class variable    See this for more details   The list of default values can be found here

[java] What is a Java String's default initial value?

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