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When is the memory allocated for an array.
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How do you access elements in an array?
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Java (Chapter 7/8)
1D/2D Arrays
| Question | Answer |
|---|---|
| When is the memory allocated for an array. | The memory is allocated when the array is created. |
| How do you access elements in an array? | You access an array using its index. arrayRefVar[index] is known as an array indexed variable. |
| What is the representation of the third element in an array called a? | a[2] |
| If you declare an array double [] list = {3.4, 2.0, 3.5, 5.5}; list[1] is __________. | 2.0 |
| If you declare an array double [] list = {3.4, 2.0, 3.5, 5.5}; the highest index in array list is ________. | 3 |
| How many elements are in array double [] list = new double [5]? | 5 |
| What is the correct term for numbers[99]? | indexed variable |
| Assume int [] t = {1, 2, 3, 4}. What is t.length? | 4 |
| When you pass an array to a method, the method receives _________. | the reference of the array |
| The JVM stores the array in an area of memory, called _______, which is used for dynamic memory allocation where blocks of memory are allocated and freed in an arbitrary order. | heap |
| When you return an array from a method, the method returns __________. | the reference of the array |
| The _________ method sorts the array scores of the double [] type. | java.util.Arrays.sort(scores) |
| Assume int [] scores = {1, 20, 30, 40, 50}; what value does java.util.Arrays.binarySearch(scores, 30) return? | 2 |
| Assume int [] scores = {1, 20, 30, 40, 50}; what is the output of System.out.println(java.util.Arrays.toString(scores));? | [1, 20, 30, 40, 50] |
| How can you get the word "abc" in the main method from the following call? [java Test "+" 3 "abc" 2] | args[2] |
| Assume double [][] x = new double [4][5]; what are x.length and x[2].length? | 4 and 5 |
| What is the index variable for the element at the first row and first column in array a? | a[0][0] |
| When you create an array using the following statement, the element values are automatically initialized to 0. "int [][] matrix = new int [5][5];" | True |
| The ____________ method copies the sourceArray to the targetArray. | System.arraycopy(sourceArray, 0, targetArray, 0, sourceArray.length); |
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