Explanation:

All of these can be used to iterate over a collection in Java.

Explanation:

The length property of an array returns the number of elements in the array.

Explanation:

The index 5 is out of bounds for the string “Hello” , which has indices 0 to.

Explanation:

Java performs string concatenation when a number is added to a string. 1 + “2” becomes “12” , and “12” + “2” becomes “122”

Explanation:

The ternary operator checks if x > 5 . Since x is 10 , the condition is true , so “Yes” is assigned to y

Explanation:

x++ returns the value before incrementing, so it logs 5 . ++x increments and then returns the value, so it logs 7.

Explanation:

foreach is not a valid loop in Java. The correct syntax is for-each

Explanation:

The remove() method is used to remove an element from an ArrayList

Explanation:

Option B is invalid unless create() is a static method defined in MyClass

Explanation:

All of these are used to handle exceptions in Java.

Explanation:

The square root of a negative number is NaN (Not a Number).

Explanation:

In Java, 0 and false are not comparable because they are of different types ( int and boolean ).

Explanation:

Primitive values like int are passed by value, so changing y does not affect

Explanation:

The final keyword can be used to restrict classes, methods, and variables.

Explanation:

real is not a valid Java data type. The correct type for floating-point numbers is float or double

Explanation:

Assigning a value to an index beyond the array’s length throws an
ArrayIndexOutOfBoundsException

Explanation:

The toLowerCase() method converts a string to lowercase.

Explanation:

The Math.abs() method returns the absolute value of a number.

Explanation:

The + operator performs string concatenation when one operand is a string.

Explanation:

.equals() checks for value equality, and .compareTo() compares strings lexicographically.

Explanation:

To create an immutable class, you must declare the class as final , make all fields private and final , and avoid providing setter methods.

Explanation:

The + operator performs addition first ( 10 + 20 = 30 ) and then concatenates the result with the string.

Explanation:

Java allows handling multiple exceptions using multiple catch blocks or a single catch block with multiple exceptions separated by |

Explanation:

The ternary operator checks if x > 5 . Since x is 10 , the condition is true , so x is assigned to y .

Explanation:

The substring() method returns the portion of the string from index 1 (inclusive) to 3 (exclusive), which is “el”

Explanation:

All of these are valid ways to create and manage threads in Java.

Explanation:

The concat() method appends the specified string to the end of the original string.

Explanation:

Arrays.sort() is used to sort arrays, while Collections.sort() is used for lists.

Explanation:

Division by zero throws an ArithmeticException .

Explanation:

internal is not a valid access modifier in Java. The valid ones are public , private , and protected

Explanation:

The + operator performs addition first ( 10 + 20 = 30 ) and then concatenates the result with the string “30”.

Explanation:

All of these are used to create thread-safe collections in Java.

Explanation:

The replace() method replaces all occurrences of ‘l’ with ‘L’ .

Explanation:

The indexOf() method returns the index of the first occurrence of the character ‘l’ , which is 2

Explanation:

Lambda expressions are created using the () -> {} syntax.

Explanation:

The substring() method returns the portion of the string starting from index 2 to the end.

Explanation:

Java allows handling multiple exceptions in a single catch block using the | operator.

Explanation:

The ternary operator checks if x > y . Since x is 10 and y is 20 , the condition is false , so y is returned

Explanation:

All of these are valid ways to create a stream in Java.

Explanation:

The toUpperCase() method converts the string to uppercase.

Explanation:

The Thread class is used to create and manage threads in Java.

Explanation:

A singleton class is created using a private constructor, a static instance variable, and a static factory method.

Explanation:

Both List.of() and Collections.unmodifiableList() are used to create immutable lists.

Explanation:

The length() method returns the number of characters in the string, which is 5 for “Hello”

Explanation:

The PriorityQueue class is used to create a priority queue in Java.

Explanation:

The LinkedList class is used to create a linked list in Java.

Explanation:

The contains() method checks if the string contains the specified substring, which is true for “ell”

Explanation:

The toCharArray() method converts the string to a character array, and the first element is ‘H’

Explanation:

The HashMap class is used to create a hash map in Java.

Explanation:

The matches() method checks if the string matches the specified regular expression, which is true for “.*ll.*”

Explanation:

The Stack class is used to create a stack in Java.

Explanation:

The split() method splits the string at each occurrence of ‘l’ , resulting in [“He”, “”, “o”] . The first element is “He”

Explanation:

The HashSet class is used to create a hash set in Java.

Explanation:

The equalsIgnoreCase() method compares two strings ignoring case, so “Hello” and “hello” are considered equal.

Explanation:

The replaceAll() method replaces all occurrences of ‘l’ with ‘L’

Explanation:

All of these methods are used to create thread pools in Java.

Explanation:

The startsWith() method checks if the string starts with the specified prefix, which is true for “He”

Explanation:

The endsWith() method checks if the string ends with the specified suffix, which is true for “lo”

Explanation:

The TreeMap class is used to create a tree map in Java.

Explanation:

The trim() method removes leading and trailing whitespace from the string.

Explanation:

The equals() method is case-sensitive, so “Hello” and “hello” are not equal.

Explanation:

The LinkedHashSet class is used to create a linked hash set in Java.

Explanation:

The replaceFirst() method replaces the first occurrence of ‘l’ with ‘L’

Explanation:

The charAt() method returns the character at the specified index, which is ‘o’ for index 4 .

Explanation:

The TreeSet class is used to create a tree set in Java.

Explanation:

The compareTo() method returns 0 if the strings are equal.

Explanation:

The LinkedHashMap class is used to create a linked hash map in Java.

Explanation:

The DelayQueue class is used to create a delay queue in Java.

Explanation:

The CopyOnWriteArrayList class is used to create a thread-safe array list in Java.

Explanation:

The ArrayBlockingQueue class is used to create a blocking queue in Java.

Explanation:

The substring() method returns the portion of the string from index 1 (inclusive) to 4 (exclusive), which is “ell”

Explanation:

The indexOf() method returns the index of the first occurrence of the character ‘e’ , which is 1

Explanation:

The ConcurrentHashMap class is used to create a concurrent hash map in Java.

Explanation:

The toLowerCase() method converts the string to lowercase.