Exercise (Array and Method): Write a method called arrayToString(), which takes an int array and return a String in the form of {a1, a2, ..., an}. Take note that there is no comma after the last element. The method's signature is as follows: public static String arrayToString(int[] array) Also write a test driver to test this method (you should test on empty array, one-element array, and n-element array). Notes: This is similar to the built-in function Arrays.toString(). You could study its source code. Exercise (Array and Method): Write a boolean method called contains(), which takes an array of int and an int; and returns true if the array contains the given int. The method's signature is as follows: public static boolean contains(int[] array, int key) Also write a test driver to test this method. Exercise (Array and Method): Write a method called search(), which takes an array of int and an int; and returns the array index if the array contains the given int; or -1 otherwise. The method's signature is as follows: public static int search(int[] array, int key) Also write a test driver to test this method. Exercise (Array and Method): Write a boolean method called equals(), which takes two arrays of int and returns true if the two arrays are exactly the same (i.e., same length and same contents). The method's signature is as follows: public static boolean equals(int[] array1, int[] array2) Also write a test driver to test this method. Exercise (Array and Method): Write a boolean method called copyOf(), which an int Array and returns a copy of the given array. The method's signature is as follows: public static int[] copyOf(int[] array) Also write a test driver to test this method. Write another version for copyOf() which takes a second parameter to specify the length of the new array. You should truncate or pad with zero so that the new array has the required length. public static int[] copyOf(int[] array, int newLength) NOTES: This is similar to the built-in function Arrays.copyOf(). Exercise (Array and Method): Write a method called reverse(), which takes an array of int and reverse its contents. For example, the reverse of {1,2,3,4} is {4,3,2,1}. The method's signature is as follows: public static void reverse(int[] array) Take note that the array passed into the method can be modified by the method (this is called "pass by reference"). On the other hand, primitives passed into a method cannot be modified. This is because a clone is created and passed into the method instead of the original copy (this is called "pass by value"). Also write a test driver to test this method. Hint: You need to use a temp location (an int) to swap the first element with the last element, and so on. Exercise (Array and Method): Write a method called swap(), which takes two arrays of int and swap their contents if they have the same length. It shall return true if the contents are successfully swapped. The method's signature is as follows: public static boolean swap(int[] array1, int[] array2) Also write a test driver to test this method. Hint: You need to use a temp location (an int) to swap the corresponding elements of the two arrays.
Exercise (Array and Method): Write a method called arrayToString(), which takes an int array and return a String in the form of {a1, a2, ..., an}. Take note that there is no comma after the last element. The method's signature is as follows:
public static String arrayToString(int[] array)
Also write a test driver to test this method (you should test on empty array, one-element array, and n-element array).
Notes: This is similar to the built-in function Arrays.toString(). You could study its source code.
Exercise (Array and Method): Write a boolean method called contains(), which takes an array of int and an int; and returns true if the array contains the given int. The method's signature is as follows:
public static boolean contains(int[] array, int key)
Also write a test driver to test this method.
Exercise (Array and Method): Write a method called search(), which takes an array of int and an int; and returns the array index if the array contains the given int; or -1 otherwise. The method's signature is as follows:
public static int search(int[] array, int key)
Also write a test driver to test this method.
Exercise (Array and Method): Write a boolean method called equals(), which takes two arrays of int and returns true if the two arrays are exactly the same (i.e., same length and same contents). The method's signature is as follows:
public static boolean equals(int[] array1, int[] array2)
Also write a test driver to test this method.
Exercise (Array and Method): Write a boolean method called copyOf(), which an int Array and returns a copy of the given array. The method's signature is as follows:
public static int[] copyOf(int[] array)
Also write a test driver to test this method.
Write another version for copyOf() which takes a second parameter to specify the length of the new array. You should truncate or pad with zero so that the new array has the required length.
public static int[] copyOf(int[] array, int newLength)
NOTES: This is similar to the built-in function Arrays.copyOf().
Exercise (Array and Method): Write a method called reverse(), which takes an array of int and reverse its contents. For example, the reverse of {1,2,3,4} is {4,3,2,1}. The method's signature is as follows:
public static void reverse(int[] array)
Take note that the array passed into the method can be modified by the method (this is called "pass by reference"). On the other hand, primitives passed into a method cannot be modified. This is because a clone is created and passed into the method instead of the original copy (this is called "pass by value").
Also write a test driver to test this method.
Hint: You need to use a temp location (an int) to swap the first element with the last element, and so on.
Exercise (Array and Method): Write a method called swap(), which takes two arrays of int and swap their contents if they have the same length. It shall return true if the contents are successfully swapped. The method's signature is as follows:
public static boolean swap(int[] array1, int[] array2)
Also write a test driver to test this method.
Hint: You need to use a temp location (an int) to swap the corresponding elements of the two arrays.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
