Can we assume default array values in Java? for example, assume that an int array is set to all zeros?

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Java Language Specification is the right place to look for such information:

Array components are unnamed variables that are created and initialized to default values (ยง4.12.5) whenever a new object that is an array is created

Default values themselves are given in section 4.12.5.

  • For type byte, the default value is zero, that is, the value of (byte)0.
  • For type short, the default value is zero, that is, the value of (short)0.
  • For type int, the default value is zero, that is, 0.
  • For type long, the default value is zero, that is, 0L.
  • For type float, the default value is positive zero, that is, 0.0f.
  • For type double, the default value is positive zero, that is, 0.0d.
  • For type char, the default value is the null character, that is, ‘\u0000’.
  • For type boolean, the default value is false.
  • For all reference types, the default value is null.

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