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Restrictions on the use of Fields during Initialization

 
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compile-time error results from the test program:



whereas the following example compiles without error:




Why is it so?
 
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Because methods, including constructors, are "after" fields: they are considered separately from the field declarations.
But between two fields, order matters.
 
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To put it another way: Your first assignment refers to variable j, which hasn't been declared yet, so the compiler doesn't recognize it (j).
 
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