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Test: Strings - 1 - EmSAT Achieve MCQ


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15 Questions MCQ Test Java for EmSAT Achieve - Test: Strings - 1

Test: Strings - 1 for EmSAT Achieve 2024 is part of Java for EmSAT Achieve preparation. The Test: Strings - 1 questions and answers have been prepared according to the EmSAT Achieve exam syllabus.The Test: Strings - 1 MCQs are made for EmSAT Achieve 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Strings - 1 below.
Solutions of Test: Strings - 1 questions in English are available as part of our Java for EmSAT Achieve for EmSAT Achieve & Test: Strings - 1 solutions in Hindi for Java for EmSAT Achieve course. Download more important topics, notes, lectures and mock test series for EmSAT Achieve Exam by signing up for free. Attempt Test: Strings - 1 | 15 questions in 30 minutes | Mock test for EmSAT Achieve preparation | Free important questions MCQ to study Java for EmSAT Achieve for EmSAT Achieve Exam | Download free PDF with solutions
Test: Strings - 1 - Question 1
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Which of the following best describes a String in Java?

Detailed Solution for Test: Strings - 1 - Question 1

Strings in Java represent a sequence of characters.

Test: Strings - 1 - Question 2
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Which of the following statements is true about mutable and immutable strings in Java?

Detailed Solution for Test: Strings - 1 - Question 2

Immutable strings are created using the 'String' class in Java, and their values cannot be modified after creation.

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Test: Strings - 1 - Question 3
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What is the difference between StringBuffer and StringBuilder in Java?

Detailed Solution for Test: Strings - 1 - Question 3

'StringBuffer' and 'StringBuilder' are similar in functionality, but 'StringBuffer' is synchronized (thread-safe), while 'StringBuilder' is not.

Test: Strings - 1 - Question 4
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Which of the following methods is used to concatenate two strings in Java?
Detailed Solution for Test: Strings - 1 - Question 4

The 'append()' method of 'StringBuilder' or 'StringBuffer' is used to concatenate strings in Java.

Test: Strings - 1 - Question 5
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What is the output of the following code snippet?
String str = "Hello";
str += " World";
System.out.println(str);
Detailed Solution for Test: Strings - 1 - Question 5

The '+=' operator is used to concatenate strings in Java. The initial value of 'str' is "Hello", and it is concatenated with " World" using '+='.

Test: Strings - 1 - Question 6
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What is the output of the following code snippet?
String str1 = "Hello";
String str2 = "Hello";
System.out.println(str1 == str2);
Detailed Solution for Test: Strings - 1 - Question 6

The '==' operator compares references for objects. In this case, both 'str1' and 'str2' point to the same string literal "Hello" in the string pool.

Test: Strings - 1 - Question 7
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What is the output of the following code snippet?
String str = "Hello";
str.replace('H', 'J');
System.out.println(str);
Detailed Solution for Test: Strings - 1 - Question 7

The 'replace()' method returns a new string with the specified character replaced, but it does not modify the original string.

Test: Strings - 1 - Question 8
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What is the output of the following code snippet?
String str = "Hello";
String newStr = str.toUpperCase();
System.out.println(newStr);
Detailed Solution for Test: Strings - 1 - Question 8

The 'toUpperCase()' method returns a new string with all characters converted to uppercase.

Test: Strings - 1 - Question 9
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What is the output of the following code snippet?
String str = "Hello World";
String[] words = str.split(" ");
System.out.println(words.length);
Detailed Solution for Test: Strings - 1 - Question 9

The 'split()' method splits a string into an array of substrings based on the specified delimiter. In this case, the delimiter is a space, so the string is split into two words.

Test: Strings - 1 - Question 10
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What is the output of the following code snippet?
String str = "Hello";
StringBuffer sb = new StringBuffer(str);
sb.append(" World");
System.out.println(sb);
Detailed Solution for Test: Strings - 1 - Question 10

The 'append()' method of 'StringBuffer' is used to concatenate the string " World" to the existing string "Hello".

Test: Strings - 1 - Question 11
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What is the output of the following code snippet?
String str1 = "Java";
String str2 = new String("Java");
System.out.println(str1 == str2);
Detailed Solution for Test: Strings - 1 - Question 11

The '==' operator compares references for objects. In this case, 'str1' and 'str2' refer to different objects, even though they contain the same value.

Test: Strings - 1 - Question 12
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What is the output of the following code snippet?
String str = "Hello";
str.concat(" World");
System.out.println(str);
Detailed Solution for Test: Strings - 1 - Question 12

The 'concat()' method returns a new string with the specified string concatenated, but it does not modify the original string.

Test: Strings - 1 - Question 13
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What is the output of the following code snippet?
StringBuffer sb = new StringBuffer("Hello");
sb.reverse();
System.out.println(sb);
Detailed Solution for Test: Strings - 1 - Question 13

The 'reverse()' method of 'StringBuffer' reverses the characters in the string.

Test: Strings - 1 - Question 14
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What is the output of the following code snippet?
String str1 = "Hello";
String str2 = "Hello";
System.out.println(str1.equals(str2));
Detailed Solution for Test: Strings - 1 - Question 14

The 'equals()' method of 'String' compares the values of two strings. In this case, 'str1' and 'str2' have the same value.

Test: Strings - 1 - Question 15
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What is the output of the following code snippet?
StringBuilder sb = new StringBuilder("Hello");
sb.delete(1, 3);
System.out.println(sb);
Detailed Solution for Test: Strings - 1 - Question 15

The 'delete()' method of 'StringBuilder' removes the characters within the specified range.

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