我试图在Java中反转一个int数组。
此方法不反转数组。
for(int i = 0; i < validData.length; i++)
{
int temp = validData[i];
validData[i] = validData[validData.length - i - 1];
validData[validData.length - i - 1] = temp;
}
有什么问题吗?
我试图在Java中反转一个int数组。
此方法不反转数组。
for(int i = 0; i < validData.length; i++)
{
int temp = validData[i];
validData[i] = validData[validData.length - i - 1];
validData[validData.length - i - 1] = temp;
}
有什么问题吗?
当前回答
import java.util.Scanner;
class ReverseArray
{
public static void main(String[] args)
{
int[] arra = new int[10];
Scanner sc = new Scanner(System.in);
System.out.println("Enter Array Elements : ");
for(int i = 0 ; i <arra.length;i++)
{
arra[i] = sc.nextInt();
}
System.out.println("Printing Array : ");
for(int i = 0; i <arra.length;i++)
{
System.out.print(arra[i] + " ");
}
System.out.println();
System.out.println("Printing Reverse Array : ");
for(int i = arra.length-1; i >=0;i--)
{
System.out.print(arra[i] + " ");
}
}
}
其他回答
public class TryReverse {
public static void main(String[] args) {
int [] array = {2,3,4,5,6,7,8,9};
reverse(array);
for(int i=0; i<array.length; ++i)
System.out.print(array[i] + " ");
}
public static void reverse (int [] array){
for(int start=0, end=array.length-1; start<=end; start++, end--){
int aux = array[start];
array[start]=array[end];
array[end]=aux;
}
}
}
上面有一些很棒的答案,但我是这样做的:
public static int[] test(int[] arr) {
int[] output = arr.clone();
for (int i = arr.length - 1; i > -1; i--) {
output[i] = arr[arr.length - i - 1];
}
return output;
}
public static int[] reverse(int[] array) {
int j = array.length-1;
// swap the values at the left and right indices //////
for(int i=0; i<=j; i++)
{
int temp = array[i];
array[i] = array[j];
array[j] = temp;
j--;
}
return array;
}
public static void main(String []args){
int[] data = {1,2,3,4,5,6,7,8,9};
reverse(data);
}
这样做不是更不可能出错吗?
int[] intArray = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
int[] temp = new int[intArray.length];
for(int i = intArray.length - 1; i > -1; i --){
temp[intArray.length - i -1] = intArray[i];
}
intArray = temp;
在Java 8的情况下,我们还可以使用IntStream来反转整数数组:
int[] sample = new int[]{1,2,3,4,5};
int size = sample.length;
int[] reverseSample = IntStream.range(0,size).map(i -> sample[size-i-1])
.toArray(); //Output: [5, 4, 3, 2, 1]