Why am I getting the Java compiler error \'\'.class\' expected\'?

Understanding the Error: Expected .class

The error "error: '.class' expected" arises during compilation when the compiler encounters a type (e.g., int or int[]) where it anticipates an expression. Syntactically, this means the only acceptable symbols would be . followed by class.

Causes of the Error

This error occurs due to compiler confusion. Syntax checking detects a type where an expression is expected, resulting in the '.class' expected message.

Example of the Error

double d = 1.9;
int i = int d;  // error: '.class' expected
         ^

Resolving the Error

• Typecast: if you intend to type cast, enclose the type in parentheses:

  double d = 1.9;
  int i = (int) d;  // Correct: type casts `1.9` to an integer

• Remove Type: if you aim to assign a value or pass a parameter, remove the type:

  int j = someFunction(a);  // Correct ... assuming 'a' type is compatible for the call.

Additional Examples

• Array Reference:

  someMethod(array[]);

  Correct it to:

  someMethod(array);  // pass reference to the entire array

  or

  someMethod(array[someExpression]);  // pass a single array element

• Parameter Declaration in Method Call:

  int i = someMethod(int j);  // Error

  Remove the parameter declaration:

  int i = someMethod(j);

• Semicolon in Array Declaration:

  int[]; letterCount = new int[26];

  Remove the semicolon:

  int[] letterCount = new int[26];

• Type Declarator Instead of Expression:

  return integers[];

  Return the entire array or a specific element:

  return integers;  

  or

  return integers[someIndex];  // Return one element of the array

• Missing Curly Braces:

  if ((withdraw % 5 == 0) && (acnt_balc >= withdraw + 0.50))
    double cur = acnt_balc - (withdraw + 0.50);
    System.out.println(cur);
  else
    System.out.println(acnt_balc);

  Enclose the "then" statements with curly braces:

  if ((withdraw % 5 == 0) && (acnt_balc >= withdraw + 0.50)) {
    double cur = acnt_balc - (withdraw + 0.50);
    System.out.println(cur);
  } else {
    System.out.println(acnt_balc);
  }

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