
Mastering Arrays and Strings in Java
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Other
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University
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Practice Problem
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Medium
Tharun AmiReddy
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21 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the default value of an uninitialized integer array in Java?
0
-1
undefined
null
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you declare an array of strings in Java?
String arrayName[] = new String[size];
String[] arrayName = new String[size];
String arrayName = new String[size];
String[] arrayName = String[size];
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What method can be used to find the length of a string in Java?
Use the size() method of the String class.
Call the getLength() function on the String object.
Use the count() method of the String class.
Use the length() method of the String class.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you concatenate two strings in Java?
You can concatenate two strings using the '-' operator.
Strings can only be concatenated using the StringBuilder class.
You must use the String.join() method to concatenate strings.
You can concatenate two strings in Java using the '+' operator or the String.concat() method.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between a one-dimensional array and a multidimensional array?
A one-dimensional array is always larger than a multidimensional array.
A one-dimensional array can only be accessed sequentially, while a multidimensional array can be accessed randomly.
A one-dimensional array can only hold numbers, while a multidimensional array can hold any data type.
A one-dimensional array is linear, while a multidimensional array can represent data in multiple dimensions.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you access the element at the second row and third column of a 2D array?
array(1,2)
array[2][3]
array[1,3]
array[1][2]
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary advantage of using StringBuilder over String in Java?
StringBuilder is immutable and safer for multi-threading.
String is more efficient for concatenation.
String uses less memory than StringBuilder.
The primary advantage of using StringBuilder over String in Java is its mutability, which allows for more efficient string manipulation.
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