Creating a method to reverse an array String[] and then checking if it is a palindrome
发布于2022-09-29 22:06 阅读(1123) 评论(0) 点赞(23) 收藏(1)
I had to create two methods. One to take an array of Strings and reverse their order. Using assertArrayEquals to test, the backwards method passed. Then I had to create a method to check if a String array is a palindrome, but that test if failing. I thought that maybe I messed something up in the backwards method, but I tested that 12 different ways. I may be really tired, but what did I do wrong here?
public static String[] backwards(String[] array) {
for (int index = 0; index < array.length / 2; index++) {
String string = array[index];
array[index] = array[array.length - index - 1];
array[array.length - index - 1] = string;
}
return array;
}
public static boolean isPalindrome(String[] array) {
if (array == backwards(array)) {
return true;
}
return false;
}
解决方案
There are two things wrong with this code:
#1 You are editing the array in place. So the backwards method does not only return a reversed array, it changes the original array.
#2 You are comparing two arrays with == which will check if it's the same instance. You can use Arrays.equals instead.
public static String[] backwards(String[] array) {
String[] resArray = new String[array.length];
for (int index = 0; index < array.length; index++) {
resArray[index] = array[array.length - index - 1];
}
return resArray;
}
public static boolean isPalindrome(String[] array) {
return Arrays.equals(array, backwards(array));
}
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