有數組a[n]，用java代碼將數組元素順序顛倒

時間 2019-11-08

標籤數組 java 代碼元素順序顛倒欄目 Java 简体版

原文原文鏈接

package cglib;java

public class StringNumber {

   public static void reverse(int[] a, int left, int right) {
            if (left >= right)
              return;
            int temp;
            temp = a[left];
            a[left] = a[right];
            a[right] = temp;
            reverse(a, ++left, --right);
          }

          public static void main(String args[]) {
            int[] a = { 1, 2, 3, 4, 5 };
            reverse(a, 0, a.length - 1);
            for (int i = 0; i < a.length; i++)
              System.out.println(a[i]);
          }

}
   less

package cglib;dom

import java.util.Arrays;class

public class StringNumber {

   public static void main(String[] args){
        int [] a = new int[]{
                        //Math.random() a pseudorandom double greater than or equal to 0.0 and less than 1.0
                        (int)(Math.random() * 1000),
                        (int)(Math.random() * 1000),
                        (int)(Math.random() * 1000),
                        (int)(Math.random() * 1000),
                        (int)(Math.random() * 1000),
                        (int)(Math.random() * 1000),
                        (int)(Math.random() * 1000)
        };
        System.out.println(Arrays.toString(a));
        swap(a);
        System.out.println(Arrays.toString(a));
    }

    public static void swap(int a[]){
        int len = a.length;
        for(int i=0;i<len/2;i++){ ////for(inti=0,int j=a.length-1;i<j;i++,j--)等效於for(int i=0;i<a.length/2;i++)
            int tmp = a[i];
            a[i] = a[len-1-i];
            a[len-1-i] = tmp;
        }
    }
}
   import