This method swaps the first and second half of the given array. @param values an array */ public void swapFirstAndSecondHalf(int[] values) { } int[] first = new int[values.length/2]; int[] second = new int [values.length/2]; for (int i = 0; i < values.length/2; i++) { second[i] = values[i]; } for (int j values.length/2; j < values.length; j++) { first[j] = values[j]; } for (int k = 0; k < values.length / 2; k++) { values[k] = first[k]; } for(int 1 = values.length / 2; 1 < values.length; l++) { values [1] = second [1]; }
This method swaps the first and second half of the given array. @param values an array */ public void swapFirstAndSecondHalf(int[] values) { } int[] first = new int[values.length/2]; int[] second = new int [values.length/2]; for (int i = 0; i < values.length/2; i++) { second[i] = values[i]; } for (int j values.length/2; j < values.length; j++) { first[j] = values[j]; } for (int k = 0; k < values.length / 2; k++) { values[k] = first[k]; } for(int 1 = values.length / 2; 1 < values.length; l++) { values [1] = second [1]; }
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Question
What do I change to make it work
Java
![```java
/**
* This method swaps the first and second half of the given array.
* @param values an array
*/
public void swapFirstAndSecondHalf(int[] values)
{
int[] first = new int[values.length / 2];
int[] second = new int[values.length / 2];
for (int i = 0; i < values.length / 2; i++) {
first[i] = values[i];
second[i] = values[i];
}
for (int j = values.length / 2; j < values.length; j++) {
first[j] = values[j];
}
for (int k = 0; k < values.length / 2; k++) {
values[k] = first[k];
}
for (int l = values.length / 2; l < values.length; l++) {
values[l] = second[l];
}
}
// This method is used to check your work
public int[] check(int[] values)
{
swapFirstAndSecondHalf(values);
return values;
}
```
### Explanation:
- **swapFirstAndSecondHalf Method:** This method takes an array `values` as input and swaps its first and second halves. It divides the input array into two halves, stores these halves in two separate arrays (`first` and `second`), and then swaps them by replacing the values.
- **check Method:** This method is used to verify the swap operation. It calls the `swapFirstAndSecondHalf` method on the input array `values` and returns the modified array.
The code uses loops to iterate through the array to divide and swap the halves.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1580620b-ec3d-48da-8d5f-e0e1d6dd1757%2F5d05fdc9-933a-4155-b75e-be7deb8ff90d%2Fe5nhr8f_processed.png&w=3840&q=75)
Transcribed Image Text:```java
/**
* This method swaps the first and second half of the given array.
* @param values an array
*/
public void swapFirstAndSecondHalf(int[] values)
{
int[] first = new int[values.length / 2];
int[] second = new int[values.length / 2];
for (int i = 0; i < values.length / 2; i++) {
first[i] = values[i];
second[i] = values[i];
}
for (int j = values.length / 2; j < values.length; j++) {
first[j] = values[j];
}
for (int k = 0; k < values.length / 2; k++) {
values[k] = first[k];
}
for (int l = values.length / 2; l < values.length; l++) {
values[l] = second[l];
}
}
// This method is used to check your work
public int[] check(int[] values)
{
swapFirstAndSecondHalf(values);
return values;
}
```
### Explanation:
- **swapFirstAndSecondHalf Method:** This method takes an array `values` as input and swaps its first and second halves. It divides the input array into two halves, stores these halves in two separate arrays (`first` and `second`), and then swaps them by replacing the values.
- **check Method:** This method is used to verify the swap operation. It calls the `swapFirstAndSecondHalf` method on the input array `values` and returns the modified array.
The code uses loops to iterate through the array to divide and swap the halves.
![### Test Case Analysis
This table outlines several test cases for a Java method programmed to swap the first and second halves of an integer array. Below are the details for each case:
#### Table Columns:
- **Name**: Describes the test status (pass/fail).
- **Arguments**: Shows the input array to the method.
- **Actual**: Displays the result or error message after running the method.
- **Expected**: Shows the expected result for the test to pass.
#### Test Results:
1. **Test Case 1**
- **Name**: fail
- **Arguments**: `check new int[] {1, 2, 3, 4}`
- **Actual**:
```
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2
at Swapper.swapFirstAndSecondHalf(Swapper.java:15)
at Swapper.check(Swapper.java:35)
at SwapperCodeCheck.main(SwapperCodeCheck.java:38)
```
- **Expected**: `[3, 4, 1, 2]`
2. **Test Case 2**
- **Name**: fail
- **Arguments**: `check new int[] {1, 2, 3, 4, 5}`
- **Actual**:
```
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2
at Swapper.swapFirstAndSecondHalf(Swapper.java:15)
at Swapper.check(Swapper.java:35)
at SwapperCodeCheck.main(SwapperCodeCheck.java:48)
```
- **Expected**: `[4, 5, 3, 1, 2]`
3. **Test Case 3**
- **Name**: pass
- **Arguments**: `check new int[] {}`
- **Actual**: `[]`
- **Expected**: `[]`
### Explanation:
- **Error Analysis**:
- The first two test cases fail due to an `ArrayIndexOutOfBoundsException`, indicating an issue in the `swapFirstAndSecondHalf()` method when attempting to access an array index that exceeds its bounds. This suggests a logical error in handling array operations, likely](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1580620b-ec3d-48da-8d5f-e0e1d6dd1757%2F5d05fdc9-933a-4155-b75e-be7deb8ff90d%2F6rgars_processed.png&w=3840&q=75)
Transcribed Image Text:### Test Case Analysis
This table outlines several test cases for a Java method programmed to swap the first and second halves of an integer array. Below are the details for each case:
#### Table Columns:
- **Name**: Describes the test status (pass/fail).
- **Arguments**: Shows the input array to the method.
- **Actual**: Displays the result or error message after running the method.
- **Expected**: Shows the expected result for the test to pass.
#### Test Results:
1. **Test Case 1**
- **Name**: fail
- **Arguments**: `check new int[] {1, 2, 3, 4}`
- **Actual**:
```
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2
at Swapper.swapFirstAndSecondHalf(Swapper.java:15)
at Swapper.check(Swapper.java:35)
at SwapperCodeCheck.main(SwapperCodeCheck.java:38)
```
- **Expected**: `[3, 4, 1, 2]`
2. **Test Case 2**
- **Name**: fail
- **Arguments**: `check new int[] {1, 2, 3, 4, 5}`
- **Actual**:
```
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2
at Swapper.swapFirstAndSecondHalf(Swapper.java:15)
at Swapper.check(Swapper.java:35)
at SwapperCodeCheck.main(SwapperCodeCheck.java:48)
```
- **Expected**: `[4, 5, 3, 1, 2]`
3. **Test Case 3**
- **Name**: pass
- **Arguments**: `check new int[] {}`
- **Actual**: `[]`
- **Expected**: `[]`
### Explanation:
- **Error Analysis**:
- The first two test cases fail due to an `ArrayIndexOutOfBoundsException`, indicating an issue in the `swapFirstAndSecondHalf()` method when attempting to access an array index that exceeds its bounds. This suggests a logical error in handling array operations, likely
Expert Solution
Step 1
This program is a java program. So we can use System.arraycopy() instead of all for a loop.
So, we are using solve the above problem of System.arraycopy() for all loops.
Step by step
Solved in 3 steps with 2 images
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