Question 14 1 pts The following bit of code is attempting to find the x-coordina

Question

Question 14 1 pts

The following bit of code is attempting to find the x-coordinate of the Point that is farthest to the right in the x-y plane in the array 'points'. One line contains an error. Which line is it?

Point[] points = ... // Assume the array has been filled with Point object references
...
double xMax = points[0].getX(); // line 1
for ( int i = 1; i < points.length; i++ ) { // line 2

if ( points[i].getX() > xMax ) { // line 3

xMax = points[i]; // line 4

}

}

Flag this Question

Question 15 1 pts

The last 3 lines in the following program are supposed to swap the two elements in the array 'blooms' identified by the index values 'mary' and 'john'. Choose from among the answers listed the correct statement for the middle of these 3 lines:

Flower[] blooms = ... // Assume this array is filled with object references
int mary, john; // Assume these variables have values assigned to them
...
Flower temp = blooms[mary];
// What statement goes here??
blooms[john] = temp;

Flag this Question

Question 16 1 pts

The following statement constructs a new String array. What initial value is stored in each of the array elements?

String[] words = new String[8];

Flag this Question

Question 17 1 pts

What is printed out by the following short program?

double[] x1 = {3.3, 4.4, 5.5, 6.6};
double[] x2 = x1;
x2[1] = 24.0;
double x = x1[1] * 2;
System.out.println(x1[1]);

Flag this Question

Question 18 1 pts

Consider this code:

String[] names = {"Mary", "Jose", "Minh"};
System.out.println(names[1]);

What is the data type of names[1]?

Flag this Question

Question 19 1 pts

[This is different than the previous question.] Consider this code:

String[] names = {"Mary", "Jose", "Minh"};
System.out.println(names[1]);

What is the data type of names?

Flag this Question

Question 20 1 pts

What will be printed by the following program?

int[] nums1 = {7, 6, 5, 4};
int[] nums2 = {7, 6, 5, 4};
boolean ans1 = (nums1 == nums2);
boolean ans2 = nums1.equals(nums2);
boolean ans3 = Arrays.equals(nums1, nums2);
System.out.println( ans1 + "-" + ans2 + "-" + ans3 );

Explanation / Answer

Point[] points = ... // Assume the array has been filled with Point object references
...
double xMax = points[0].getX(); // line 1
for ( int i = 1; i < points.length; i++ ) { // line 2
if ( points[i].getX() > xMax ) { // line 3
xMax = points[i]; // line 4
}
}

ans:line 2
=============================================

Question 15
ans : blooms[mary] = blooms[john];

when mary values goes into temp then blooms[mary] is null, so assigning blooms[john] to blooms[mary]
then value of tem assign to blooms[john] values will be swap.
==============================================================
Question 16.
ans: initial value is stored in each of the array elements is null
the value null.
===========================================================
Question 17.
ans:What is printed out by the following short program?

double[] x1 = {3.3, 4.4, 5.5, 6.6};
double[] x2 = x1;
x2[1] = 24.0;
double x = x1[1] * 2;
System.out.println(x1[1]);

output is 24.0

===========================================================
Question 18 1 pts
Consider this code:

String[] names = {"Mary", "Jose", "Minh"};
System.out.println(names[1]);
What is the data type of names[1]?

ans: string
======================================================
Question 19 1 pts
[This is different than the previous question.] Consider this code:

String[] names = {"Mary", "Jose", "Minh"};
System.out.println(names[1]);

What is the data type of names?
ans :String[]
================================================
Question 20 1 pts
What will be printed by the following program?

int[] nums1 = {7, 6, 5, 4};
int[] nums2 = {7, 6, 5, 4};
boolean ans1 = (nums1 == nums2);
boolean ans2 = nums1.equals(nums2);
boolean ans3 = Arrays.equals(nums1, nums2);
System.out.println( ans1 + "-" + ans2 + "-" + ans3 );

ans:false - false - true

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.