{"id":156,"date":"2023-09-02T06:19:09","date_gmt":"2023-09-02T06:19:09","guid":{"rendered":"https:\/\/www.multiplechoicequestions.org\/?p=156"},"modified":"2023-09-02T06:19:09","modified_gmt":"2023-09-02T06:19:09","slug":"java-string-mcq","status":"publish","type":"post","link":"https:\/\/www.multiplechoicequestions.org\/java-programming\/java-string-mcq\/","title":{"rendered":"Java String MCQ"},"content":{"rendered":"\n<p>Strings are one of the most commonly used classes in Java programming, serving as the go-to data type for textual data. This blog post aims to test your fundamental understanding of the String class in Java with 10+ multiple-choice questions (MCQs). Each question is followed by the correct answer and an explanation to help reinforce your knowledge.<\/p>\n<h2>1. How to create a new String object in Java?<\/h2>\n<div class=\"optioncontainer\">a) new String();<\/div>\n<div class=\"optioncontainer\">b) String.new();<\/div>\n<div class=\"optioncontainer\">c) String{};<\/div>\n<div class=\"optioncontainer\">d) new Object(String);<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer1')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer1\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) new String();<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The new String(); syntax is used to create a new String object in Java.<\/p>\n<\/div>\n\n<h2>2. What is the output of &#8220;Java&#8221; == &#8220;Java&#8221; in Java?<\/h2>\n<div class=\"optioncontainer\">a) true<\/div>\n<div class=\"optioncontainer\">b) false<\/div>\n<div class=\"optioncontainer\">c) Compilation error<\/div>\n<div class=\"optioncontainer\">d) Runtime error<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer2')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer2\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) true<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Both string literals point to the same object in the string pool, so == will return true.<\/p>\n<\/div>\n\n<h2>3. What does the charAt() method do?<\/h2>\n<div class=\"optioncontainer\">a) Returns the character at a specific index<\/div>\n<div class=\"optioncontainer\">b) Changes the character at a specific index<\/div>\n<div class=\"optioncontainer\">c) Removes the character at a specific index<\/div>\n<div class=\"optioncontainer\">d) None of the above<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer3')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer3\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) Returns the character at a specific index<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The charAt(int index) method returns the character at the specified index in the string.<\/p>\n<\/div>\n\n<h2>4. What is the result of statement: String str = null;?<\/h2>\n<div class=\"optioncontainer\">a) Creates a new String with no characters<\/div>\n<div class=\"optioncontainer\">b) Creates a String pointing to &#8220;null&#8221;<\/div>\n<div class=\"optioncontainer\">c) Does not create any String<\/div>\n<div class=\"optioncontainer\">d) Creates an empty String<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer4')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer4\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">c) Does not create any String<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Declaring a String variable as null means it does not point to any memory location for an object.<\/p>\n<\/div>\n\n<h2>5. How to convert a string to upper case in Java?<\/h2>\n<div class=\"optioncontainer\">a) toUpperCase()<\/div>\n<div class=\"optioncontainer\">b) upperCase()<\/div>\n<div class=\"optioncontainer\">c) toUppercase()<\/div>\n<div class=\"optioncontainer\">d) Uppercase()<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer5')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer5\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) toUpperCase()<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The toUpperCase() method converts all the characters in a given string to upper case.<\/p>\n<\/div>\n\n<h2>6. What does the length() method return?<\/h2>\n<div class=\"optioncontainer\">a) ASCII value of first character<\/div>\n<div class=\"optioncontainer\">b) Number of characters<\/div>\n<div class=\"optioncontainer\">c) A new String<\/div>\n<div class=\"optioncontainer\">d) None of the above<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer6')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer6\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) Number of characters<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The length() method returns the number of characters in a string.<\/p>\n<\/div>\n\n<h2>7. Which method is used to check the equality of the content of two strings in Java?<\/h2>\n<div class=\"optioncontainer\">a) ==<\/div>\n<div class=\"optioncontainer\">b) compareTo()<\/div>\n<div class=\"optioncontainer\">c) equals()<\/div>\n<div class=\"optioncontainer\">d) equalStrings()<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer7')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer7\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">c) equals()<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The equals() method is used to check if two strings have the same content. The == operator checks for reference equality, compareTo() is used for lexicographical comparison, and there is no built-in method named equalStrings() in Java.<\/p>\n<\/div>\n\n<h2>8. What is the result of &#8220;Java&#8221;.concat(&#8220;Script&#8221;)?<\/h2>\n<div class=\"optioncontainer\">a) Java Script<\/div>\n<div class=\"optioncontainer\">b) JavaScript<\/div>\n<div class=\"optioncontainer\">c) JavaconcatScript<\/div>\n<div class=\"optioncontainer\">d) A compilation error<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer8')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer8\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) JavaScript<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The concat method appends the specified string to the end of another string.<\/p>\n<\/div>\n\n<h2>9. Which method replaces a character in a string?<\/h2>\n<div class=\"optioncontainer\">a) replace()<\/div>\n<div class=\"optioncontainer\">b) replaceChar()<\/div>\n<div class=\"optioncontainer\">c) setChar()<\/div>\n<div class=\"optioncontainer\">d) changeChar()<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer9')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer9\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) replace()<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The replace() method replaces a character or a sequence of characters in a string.<\/p>\n<\/div>\n\n<h2>10. Which method removes whitespace from the beginning and end of a string?<\/h2>\n<div class=\"optioncontainer\">a) trim()<\/div>\n<div class=\"optioncontainer\">b) strip()<\/div>\n<div class=\"optioncontainer\">c) clean()<\/div>\n<div class=\"optioncontainer\">d) chop()<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer10')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer10\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) trim()<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The trim() method removes whitespace from both the beginning and the end of the string.<\/p>\n<\/div>\n\n<h2>11. Is the String class in Java thread-safe?<\/h2>\n<div class=\"optioncontainer\">a) Yes<\/div>\n<div class=\"optioncontainer\">b) No<\/div>\n<div class=\"optioncontainer\">c) Only when synchronized<\/div>\n<div class=\"optioncontainer\">d) Depends on the method being called<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer11')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer11\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) Yes<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Strings in Java are immutable, which means once a String object is created, its value cannot be modified. This inherent immutability makes them thread-safe, as multiple threads cannot change their value simultaneously.<\/p>\n<\/div>\n\n<h2>12. What is the String Constant Pool in Java?<\/h2>\n<div class=\"optioncontainer\">a) A pool where all string methods are stored<\/div>\n<div class=\"optioncontainer\">b) A special area of the heap memory where string literals are stored and reused<\/div>\n<div class=\"optioncontainer\">c) A memory space where string objects are stored temporarily<\/div>\n<div class=\"optioncontainer\">d) A section of the Java library dedicated to string operations<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer12')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer12\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) A special area of the heap memory where string literals are stored and reused<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The String Constant Pool is a specific area in the heap memory where Java stores string literals. The primary purpose of this is to save memory by reusing existing strings.<\/p>\n<\/div>\n\n<h2>13. When does a string get added to the String Constant Pool?<\/h2>\n<div class=\"optioncontainer\">a) Whenever the new keyword is used<\/div>\n<div class=\"optioncontainer\">b) Whenever a string is modified using string methods<\/div>\n<div class=\"optioncontainer\">c) When a string literal is defined in the code<\/div>\n<div class=\"optioncontainer\">d) Whenever a string is passed as an argument to a method<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer13')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer13\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">c) When a string literal is defined in the code<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>String literals automatically get a spot in the String Constant Pool. Using the new keyword, on the other hand, ensures that the string object is created in the heap memory outside of this pool.<\/p>\n<\/div>\n\n<h2>14. How can you ensure that a string created using the new keyword gets placed in the String Constant Pool?<\/h2>\n<div class=\"optioncontainer\">a) By appending another string to it<\/div>\n<div class=\"optioncontainer\">b) By using the intern() method of the String class<\/div>\n<div class=\"optioncontainer\">c) By converting it to a string literal<\/div>\n<div class=\"optioncontainer\">d) By calling the toString() method on it<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer14')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer14\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) By using the intern() method of the String class<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The intern() method ensures that the string is placed in the String Constant Pool. If a string with the same content already exists there, it returns the reference to that string; otherwise, it places the string in the pool and returns its reference.<\/p>\n<\/div>\n\n<h2>15. Why does Java utilize a String Constant Pool?<\/h2>\n<div class=\"optioncontainer\">a) To increase the complexity of string operations<\/div>\n<div class=\"optioncontainer\">b) To ensure that each string object has a unique memory address<\/div>\n<div class=\"optioncontainer\">c) To save memory by avoiding the storage of duplicate string values<\/div>\n<div class=\"optioncontainer\">d) To improve the speed of string concatenation operations<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer15')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer15\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">c) To save memory by avoiding the storage of duplicate string values<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The primary reason for the existence of the String Constant Pool is memory optimization. By reusing references for string literals with the same value, Java ensures that memory is used efficiently.<\/p>\n<\/div>\n\n\n<br \/><script>\n   window.onload = function() {\ndocument.getElementById('answer1').style.display = 'none';\ndocument.getElementById('answer2').style.display = 'none';\ndocument.getElementById('answer3').style.display = 'none';\ndocument.getElementById('answer4').style.display = 'none';\ndocument.getElementById('answer5').style.display = 'none';\ndocument.getElementById('answer6').style.display = 'none';\ndocument.getElementById('answer7').style.display = 'none';\ndocument.getElementById('answer8').style.display = 'none';\ndocument.getElementById('answer9').style.display = 'none';\ndocument.getElementById('answer10').style.display = 'none';\ndocument.getElementById('answer11').style.display = 'none';\n     document.getElementById('answer12').style.display = 'none';\n     document.getElementById('answer13').style.display = 'none';\n     document.getElementById('answer14').style.display = 'none';\n     document.getElementById('answer15').style.display = 'none';\n    };\n\n    function toggleAnswer(answerId) {\n      var answer = document.getElementById(answerId);\n      if (answer.style.display === \"none\") {\n        answer.style.display = \"block\";\n      } else {\n        answer.style.display = \"none\";\n      }\n    }\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Strings are one of the most commonly used classes in Java programming, serving as the go-to data type for textual data. This blog post aims to test your fundamental understanding of the String class in Java with 10+ multiple-choice questions (MCQs). 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