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Which of the following statements about arrays in Java is true?
- a)Arrays can dynamically change their size at runtime.
- b)Arrays can only store primitive data types.
- c)Arrays can store elements of different types.
- d)Arrays have a fixed size determined at the time of declaration.
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements about arrays in Java is true?a)Array...
Fixed Size of Arrays in Java
In Java, arrays are used to store multiple elements of the same data type. They provide a convenient way to group related data together. One important characteristic of arrays in Java is that they have a fixed size determined at the time of declaration. This means that once an array is created, its size cannot be changed dynamically during runtime.
Array Declaration and Initialization
To declare an array in Java, you need to specify the data type of the elements it will store and the number of elements it can hold. For example, to declare an array of integers that can store 5 elements, you would write:
int[] nums = new int[5];
This creates an array named "nums" with a fixed size of 5. The array is initialized with default values for the specified data type. In this case, the default value for integers is 0.
Accessing Array Elements
Array elements can be accessed using their index, which represents their position within the array. The index starts from 0 for the first element and goes up to (size - 1) for the last element. For example, to access the first element of the "nums" array declared earlier, you would write:
int firstElement = nums[0];
Array Size Constraints
Since arrays in Java have a fixed size, you need to ensure that the size you specify during declaration is sufficient to store all the elements you will need. If you try to access or modify an element at an index that is outside the valid range for the array, you will encounter an "ArrayIndexOutOfBoundsException".
Dynamically Changing Array Size
If you need a data structure that can dynamically change its size at runtime, you can use other classes provided by Java, such as ArrayList or LinkedList. These classes implement dynamic arrays or linked lists internally and allow you to add or remove elements as needed.
Conclusion
In conclusion, the correct statement about arrays in Java is that they have a fixed size determined at the time of declaration. Arrays are a useful data structure for storing multiple elements of the same type, but their size cannot be changed once they are created. If you need a dynamic data structure, you can use classes like ArrayList or LinkedList.
In Java, arrays are used to store multiple elements of the same data type. They provide a convenient way to group related data together. One important characteristic of arrays in Java is that they have a fixed size determined at the time of declaration. This means that once an array is created, its size cannot be changed dynamically during runtime.
Array Declaration and Initialization
To declare an array in Java, you need to specify the data type of the elements it will store and the number of elements it can hold. For example, to declare an array of integers that can store 5 elements, you would write:
int[] nums = new int[5];
This creates an array named "nums" with a fixed size of 5. The array is initialized with default values for the specified data type. In this case, the default value for integers is 0.
Accessing Array Elements
Array elements can be accessed using their index, which represents their position within the array. The index starts from 0 for the first element and goes up to (size - 1) for the last element. For example, to access the first element of the "nums" array declared earlier, you would write:
int firstElement = nums[0];
Array Size Constraints
Since arrays in Java have a fixed size, you need to ensure that the size you specify during declaration is sufficient to store all the elements you will need. If you try to access or modify an element at an index that is outside the valid range for the array, you will encounter an "ArrayIndexOutOfBoundsException".
Dynamically Changing Array Size
If you need a data structure that can dynamically change its size at runtime, you can use other classes provided by Java, such as ArrayList or LinkedList. These classes implement dynamic arrays or linked lists internally and allow you to add or remove elements as needed.
Conclusion
In conclusion, the correct statement about arrays in Java is that they have a fixed size determined at the time of declaration. Arrays are a useful data structure for storing multiple elements of the same type, but their size cannot be changed once they are created. If you need a dynamic data structure, you can use classes like ArrayList or LinkedList.
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Which of the following statements about arrays in Java is true?a)Array...
In Java, arrays have a fixed size that is determined at the time of declaration and cannot be changed.
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Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer? for EmSAT Achieve 2025 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer?.
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Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Which of the following statements about arrays in Java is true?a)Arrays can dynamically change their size at runtime.b)Arrays can only store primitive data types.c)Arrays can store elements of different types.d)Arrays have a fixed size determined at the time of declaration.Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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