public static void main(String[] args) {
int[] nums = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19}
System.out.print("原数组:")
for (int num : nums) {
System.out.print(num+" ")
}
System.out.print("\n倒序新数组:")
for (int num : reverseArray1(nums)) {
System.out.print(num + " ")
}
}
//1.排序后倒序
public static int[] reverseArray1(int[] nums) {
Arrays.sort(nums)
int[] reNums = new int[nums.length]
for (int i = 0i <nums.lengthi++) {
reNums[i] = nums[nums.length - 1 - i]
}
return reNums
}
//2.Collection 内置的逆序
public static int[] reverseArray2(int[] nums) {
ArrayList<Integer>list = new ArrayList<>()
for (int i = 0i <nums.lengthi++) {
list.add(nums[i])
}
Collections.reverse(list)
int [] reNums = new int[nums.length]
for (int i = 0i <nums.length i++) {
reNums[i] = list.get(i)
}
return reNums
}
使用递减的for循环,然后用charAt倒序获取字符串。代码如下
String str="qwertyuiop"for (int i = str.length()-1 i >= 0 i--) { // 字符串下标从0开始,长度-1结束。倒序所以从长度-1开始,0结束。
System.out.print(str.charAt(i))
}