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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

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
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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