Given the following declarations String s1=new String("Hello")String s2=new String("there");String s3=new String(); Which of the following are legal operations?

technology programming languages

  1. s3=s1 + s2;

  2. s3=s1-s2;

  3. s3=s1 & s2;

  4. s3=s1 && s2

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Correct Option: A

AI Explanation

To answer this question, we need to understand the different operations that can be performed on strings in Java.

Option A) s3=s1 + s2 - This option is legal. The + operator can be used to concatenate two strings in Java. Therefore, s1 + s2 will concatenate the strings "Hello" and "there", resulting in the string "Hellothere". The concatenated string can then be assigned to s3.

Option B) s3=s1 - s2 - This option is not legal. The - operator is not defined for strings in Java. Therefore, we cannot subtract one string from another.

Option C) s3=s1 & s2 - This option is not legal. The & operator is a bitwise operator and is not defined for strings in Java. Therefore, we cannot perform a bitwise operation on strings.

Option D) s3=s1 && s2 - This option is not legal. The && operator is a logical operator and is not defined for strings in Java. Therefore, we cannot perform a logical operation on strings.

The correct answer is A) s3=s1 + s2. This option is legal because the + operator can be used to concatenate strings in Java.

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