java 一维数组的反转

Posted 2022-05-17 DQ_CODING

代码

public class ReverseArray 
    public static void main(String[] args) 
        String[] str = "AA", "BB", "CC", "DD";
        System.out.println(Arrays.toString(str));
        reverse1(str);
        System.out.println(Arrays.toString(str));
        reverse2(str);
        System.out.println(Arrays.toString(str));
        reverse3(str);
        System.out.println(Arrays.toString(str));
    

    //    方式1
    public static void reverse1(String[] str) 
        int j = 0;
        for (int i = str.length - 1; i > 0; i--) 
            str[j++] = str[i];
        
    

    //    方式2
    public static void reverse2(String[] str) 
//        i:交换次数
        for (int i = 0; i < str.length / 2; i++) 
            String temp = str[i];
//            和对应的位置进行交换
            str[i] = str[str.length - i - 1];
            str[str.length - i - 1] = temp;
        
    

    //    方式3
    public static void reverse3(String[] str) 
        for (int i = 0,j=str.length-1; i <j; i++,j--) 
            String temp=str[i];
            str[i]=str[j];
            str[j]=temp;