Practice 2d Array Example: Matrix Print (6.8) - Chapter 6: Arrays and Strings in Java

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8 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is a 2D array?
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Think about how data is organized in a table.
Question 2.
How do you access the first element of a 2D array?
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Remember, indexing starts at zero!
3Question 3.
What is the output of the following code snippet where mat is initialized as {{1, 2}, {3, 4}}?

for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) { System.out.print(mat[i][j] + " "); } }
- 1 2 3 4
- 1 3 2 4
- 1 2 3 4
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Pay attention to how the elements are printed.
4Question 4.
True or False: A 2D array can be considered as an array in which each element is also an array.
- True
- False
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Think about the definition of a 2D array.
Question 5.
Write a program that checks if a given 2D array is symmetric (the same forwards and backwards).
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Think about how elements are mirrored in a symmetric matrix.
Question 6.
Create a function that finds the maximum value in a 2D array and returns its position.
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Be methodical in checking each position as you search.

4 more questions in this section. Enroll free to practise them all.