Select the correct answerWhich of the following variable declaration would NOT compile in a java program?Optionsint VAR;int var;int 1_var;int var1;int var_1;

Break Down the Problem

1. Identify all the variable declaration options.
2. Understand Java naming conventions for variable declarations.
3. Determine which variable name violates the conventions.

Relevant Concepts

• In Java, variable names:
  1. Must begin with a letter (a-z, A-Z), underscore (_), or dollar sign ($).
  2. Cannot begin with a digit.
  3. Can include letters, digits (0-9), underscores, and dollar signs.
  4. Cannot use reserved keywords as names.

Analysis and Detail

1. Option 1: int VAR; – Valid, uses uppercase letters.
2. Option 2: int var; – Valid, uses lowercase letters.
3. Option 3: int 1_var; – Invalid, as it begins with a digit.
4. Option 4: int var1; – Valid, starts with a letter and followed by a number.
5. Option 5: int var_1; – Valid, starts with a letter and includes an underscore.

Verify and Summarize

Among the options provided, the only variable declaration that does not follow Java's naming rules is int 1_var; because it starts with a digit, making it invalid.

Final Answer

The variable declaration that would NOT compile is int 1_var;.