To answer this question, you need to understand the concept of widening conversions. Widening conversions are conversions that do not result in any loss of data or precision. Let's go through each option to understand why it is correct or incorrect:

Option A) Short integer to character - This option is incorrect because it is a valid widening conversion rule. When a short integer is converted to a character, it is promoted to an int first and then converted to a character.

Option B) Integer to long integer - This option is incorrect because it is a valid widening conversion rule. When an integer is converted to a long integer, it is promoted to a long integer without any loss of data or precision.

Option C) Floating-point to double precision floating-point - This option is incorrect because it is a valid widening conversion rule. When a floating-point value is converted to a double precision floating-point value, it is promoted to a double precision floating-point without any loss of data or precision.

Option D) Character to floating-point - This option is correct because it is not a valid widening conversion rule. Converting a character to a floating-point value is considered a narrowing conversion, as it can result in a loss of data or precision.

Therefore, the correct answer is Option D. This option is not a widening conversion rule because it involves a narrowing conversion.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Strings are a primitive type in Java and the StringBuffer is used as the matching wrapper type. This option is incorrect because strings are not primitive types in Java. They are objects of the String class, which is part of the Java API. The StringBuffer class is used for mutable strings, but it is not a wrapper type for strings.

Option B) The size of a string can be retrieved using the length property. This option is correct. In Java, the length() method is used to get the number of characters in a string.

Option C) Strings are a primitive type in Java that overloads the + operator for concatenation. This option is correct. In Java, strings are not primitive types, but they are treated as first-class citizens and have a special syntax for concatenation using the + operator.

Option D) The String class is implemented as a char array, elements are addressed using the stringname[] convention. This option is incorrect. While the String class does contain a char array internally, the elements of the array cannot be directly addressed using the stringname[] convention. Instead, you need to use methods provided by the String class to access or manipulate the characters.

The correct answer is C. Strings are not primitive types in Java but are treated as such and overload the + operator for concatenation.

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• Wrong explanation