The easiest way to reverse the array is to use the existing APIs built for this very purpose.Collections.reverse()method is such an API. This method reverses the elements in a list, so we must convert the array into a list first by usingjava.util.Arrays.asList(array)and then reverse th...
方法二:使用Collections工具类实现数组反转 publicvoidreverseArray(int[]arr){List<Integer>list=Arrays.stream(arr).boxed().collect(Collectors.toList());Collections.reverse(list);for(inti=0;i<arr.length;i++){arr[i]=list.get(i);}} 1. 2. 3. 4. 5. 6. 7. 上面的代码示例中,我们先将数组...
public static void reverseRowsUsingCollectionsReverse(int[][] array) { for (int row = 0; row < array.length; row++) { List <Integer> collectionBoxedRow = Arrays.stream(array[row]) .boxed() .collect(Collectors.toList()); Collections.reverse(collectionBoxedRow); array[row] = collectionBoxe...
public static void main (String[] args) throws java.lang.Exception { int[] a= {1,2,4,5}; System.out.println( Arrays.toString(reverseArray(a))); } public static int[] reverseArray(int[] nums){ int begin=0; int end= nums.length -1;while(begin <end){ swap(nums, begin++, end-...
int[]arr={1,2,3,4,5};intstart=0;intend=arr.length-1;while(start<end){inttemp=arr[start];arr[start]=arr[end];arr[end]=temp;start++;end--;}System.out.println(Arrays.toString(arr)); 1. 2. 3. 4. 5. 6. 7. 8. 9.
数组反转 要求：把数组的元素内容反转。 ArrayReverse.java arr {11,22,33,44,55,66} {66, 55,...
Java Code: // Import the Arrays class from the java.util package.importjava.util.Arrays;// Define a class named Exercise11.publicclassExercise11{// The main method where the program execution starts.publicstaticvoidmain(String[]args){// Declare and initialize an integer array 'my_array1'.in...
可以从Arrays.sort底层代码看出其使用的是快排的思想: java/util/DualPivotQuicksort.java:107 staticvoidsort(int[]a,intleft,intright,int[]work,intworkBase,intworkLen){// Use Quicksort on small arraysif(right-left<QUICKSORT_THRESHOLD){sort(a,left,right,true);return;} ...
constfruits = ["Banana","Orange","Apple","Mango"]; fruits.reverse(); Try it Yourself » Description Thereverse()method reverses the order of the elements in an array. Thereverse()method overwrites the original array. See Also:
Arrays.sort(a, Collections.reverseOrder()); sorts the array in reverse-lexicographic (alphabetical) order. The returned comparator is serializable. Java documentation for java.util.Collections.reverseOrder(). Portions of this page are modifications based on work created and shared by the Android Op...