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Assertions

janki tangeda
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Joined: Jun 07, 2005
Posts: 54
assert Expression1:Expression2;

For the above form of assert statement, the Expression2 is required to be a value(either primitive type or reference type).

But in the example below, Expression 2 is a String object(not a reference value of String object).

assert age>0 : "The value of age cannot be negative +"age;

can anybody explain?
Steve Morrow
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Joined: May 22, 2003
Posts: 657

The result of that expression is a reference to a String object.
janki tangeda
Ranch Hand

Joined: Jun 07, 2005
Posts: 54
What's the result?
Steve Morrow
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Joined: May 22, 2003
Posts: 657

The result is a reference to a new String object that is the concatenation of "The value of age cannot be negative " (accounting for the typo) and the String value of 'age'.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Assertions