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not a statement

This error occurs when a syntactically correct statement does not appear where it should. Examples:

  • Writing an assignment statement without the assignment operator: max ;          // Error, missing = Eclipse: Syntax error, insert "AssignmentOperator Expression"    to complete Expression
  • Misspelling else : if (i > j)   max = i;els ;          // Error, else not spelled correctly The reason you do not get “else expected” is that you need not write an else alternative so this just looks like a bad statement.

    Eclipse:
    els cannot be resolved

    Syntax error, insert "AssignmentOperator Expression" to complete Expression
    The same identifier can be used in different methods and classes. An important task of the compiler is to resolve the ambiguity of multiple uses of the same identifer; for example, if a variable is declared both directly within a class and also withina method, the use of its unqualified name is resolved in favor of the local variable. This error message simply means that the compiler could not obtain an(unambiguous) meaning for the identifier els .
  • The following code: if (i > j)   max = i;els           // Error, else not spelled correctly   max = j; results in a weird error message: x.java:6: cannot find symbol symbol  : class elslocation: class x els The reason is that the compiler interprets this as a declaration: els max = j; and can't find a class els as the type of the variable max .
    Eclipse: Duplicate local variable max els cannot be resolved to a type These messages are more helpful: first, the use of the word type instead of class is more exact because the type of a variable need not be a class (it could be a primitive type or interface);second, the message about the duplicate variable gives an extra clue as to the source of the error.
  • The error can also be caused by attempting to declare a variable whose name is that of a reserved keyword: void f() {   int default = 10;} Eclipse: Syntax error on token "default", invalid VariableDeclaratorId

cannot find symbol

This is probably the most common compile-time error. All identifiers in Java must be declared before being used and an inconsistency between the declarationof an identifier and its use will give rise to this error. Carefully check the spelling of the identifier. It is easy to make a mistake by using a lower-case letter instead of an upper case one, or to confuse the letter O withthe numeral 0 and the letter l with the numeral 1.

Other sources of this error are: calling a constructor with an incorrect parameter signature, andusing an identifier outside its scope, for example, using an identifier declared in a for -loop outside the loop:

int[] a = {1, 2, 3};int sum = 0; for (int i = 0; i < a.length; i++)   sum = sum + a[i]; System.out.println("Last = " + i);        // Error, i not in scope

Eclipse: ... cannot be resolved

... is already defined in ...

An identifier can only be declared once in the same scope:

int sum = 0; double sum = 0.0;   // Error, sum already defined

Eclipse: Duplicate local variable sum

array required but ... found

This error is caused by attempting to index a variable which is not an array.

int max(int i, int j) {   if (i > j) return i;   else return j[i];              // Error, j is not an array }

Eclipse: The type of the expression must be an array type but it resolved to int

... has private access in ...

It is illegal to access a variable declared private outside its class.

Eclipse: The field ... is not visible

Questions & Answers

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Compile and runtime errors in java. OpenStax CNX. Dec 28, 2009 Download for free at http://cnx.org/content/col10913/1.2
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