Implement the method makeArray. (10 points) • public static Employee[] makeArray(Employee first, Employee second, Employee third).
时间: 2024-05-11 07:16:02 浏览: 4
Sure, here's an implementation of the `makeArray` method in Java:
```
public static Employee[] makeArray(Employee first, Employee second, Employee third) {
Employee[] array = new Employee[3];
array[0] = first;
array[1] = second;
array[2] = third;
return array;
}
```
This method takes three `Employee` objects as input and returns an array of `Employee` objects containing those three objects in order. The method first creates an array of size 3, then assigns each input `Employee` object to a specific index in the array, and finally returns the array.
相关问题
4. Implement the method copyArray. Use indexes to implement this method. • public static Employee[] copyArray(Employee[] array).
Sure, here's the implementation for the `copyArray` method that takes an array of `Employee` objects and returns a new array with the same elements:
```java
public static Employee[] copyArray(Employee[] array) {
Employee[] newArray = new Employee[array.length];
for (int i = 0; i < array.length; i++) {
newArray[i] = array[i];
}
return newArray;
}
```
In this implementation, we create a new array `newArray` with the same length as the input array `array`. Then, we iterate over the indexes of `array`, copying the element at each index to the corresponding index in `newArray`. Finally, we return `newArray`.
用java Implement the function to reverse an array.
Sure, here's an example implementation of a function to reverse an array in Java:
```java
public static void reverseArray(int[] arr) {
int left = 0;
int right = arr.length - 1;
while (left < right) {
// Swap the elements at the left and right indices
int temp = arr[left];
arr[left] = arr[right];
arr[right] = temp;
// Move the left and right indices inwards
left++;
right--;
}
}
```
To use this function, you would pass in an array of integers like this:
```java
int[] arr = {1, 2, 3, 4, 5};
reverseArray(arr);
System.out.println(Arrays.toString(arr)); // Output: [5, 4, 3, 2, 1]
```
This function works by initializing two pointers, `left` and `right`, at opposite ends of the array. It then swaps the elements at these indices and moves the pointers inwards until they meet in the middle. This effectively reverses the order of the elements in the array.