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Concept explainers
a.
Explanation of Solution
Allocating an array
- In java, an array is created with the keyword new that is used for allocating memory.
- Hence allocating an array consists of two steps that is to declare a variable of the desired array type and to allocate the memory that will hold the array using new keyword and assigning it to the array variable.
- In java, all arrays are dynamically allocated.
- The code for allocating an array of ten integers is
// Declaring an array
int[] nums = new int[10];
b.
Explanation of Solution
Declaring initial element of the array
- In java, an array is created with the keyword new that is used for allocating memory.
- In java, all arrays are dynamically allocated.
- An integer variable can be used as the index of the array.
- Hence here 0 is the index of the array.
- The code for putting 17 as the initial element of the array is
// Declaring initial element
nums[0] = 17;
c.
Explanation of Solution
Declaring last element of array
- In java, an array is created with the keyword new that is used for allocating memory.
- In java, all arrays are dynamically allocated.
- An integer variable can be used as the index of the array.
- Hence here 9 is the last element of the array.
- The code for putting 29 as the last element of the array is
// Declaring last element
nums[9] = 29;
d.
Explanation of Solution
Filling remaining elements with -1
- In java, an array is created with the keyword new that is used for allocating memory.
- In java, all arrays are dynamically allocated.
- The for loop is executed for filling the remaining elements with -1.
- The code for filling the remaining elements with -1 is
// Execute for loop
for (int i = 1; i < 9; i++)
{
nums[i] = -1;
}
e.
Explanation of Solution
Adding 1 to each element of array
- In java, an array is created with the keyword new that is used for allocating memory.
- In java, all arrays are dynamically allocated.
- The for loop is executed for adding 1 to each element of array.
- The code for adding 1 to each element of array is
// Execute for loop
for (int i = 0; i < nums.length; i++)
{
nums[i]++;
}
f.
Explanation of Solution
Printing all elements of array one per line
- In java, an array is created with the keyword new that is used for allocating memory.
- In java, all arrays are dynamically allocated.
- The for loop is executed for printing all elements of array one per line.
- The code for printing all elements of array one per line is
// Execute for loop
for (int num : nums)
{
System.out.println(num);
}
g.
Explanation of Solution
Printing all elements of array in a single line
- In java, an array is created with the keyword new that is used for allocating memory.
- In java, all arrays are dynamically allocated.
- Here if condition is executed inside the for loop for printing all elements of array in a single line.
- The code for printing all elements of array in a single line is
// Execute for loop
for (int i = 0; i < nums.length; i++)
{
// Execute if condition
if (i < nums.length - 1)
// Print the statement
System.out.print(nums[i] + ",");
else
// Print the statement
System.out.println(nums[i]);
}
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Chapter 7 Solutions
EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
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