Why am I getting the Java compiler error \'\'.class\' expected\'?-javaTutorial-php.cn

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

Patricia Arquette

Release： 2024-11-21 04:45:14

Original

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Why am I getting the Java compiler error

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
         ^

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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
```
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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.
```
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Additional Examples

Array Reference:

someMethod(array[]);

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Correct it to:

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

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

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Parameter Declaration in Method Call:
```
int i = someMethod(int j);  // Error
```
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Remove the parameter declaration:
```
int i = someMethod(j);
```
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Semicolon in Array Declaration:
```
int[]; letterCount = new int[26];
```
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Remove the semicolon:
```
int[] letterCount = new int[26];
```
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Type Declarator Instead of Expression:
```
return integers[];
```
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Return the entire array or a specific element:
```
return integers;  
```
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or
```
return integers[someIndex];  // Return one element of the array
```
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Missing Curly Braces:

if ((withdraw % 5 == 0) &amp;&amp; (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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Enclose the "then" statements with curly braces:

if ((withdraw % 5 == 0) &amp;&amp; (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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