【Java】左旋字符串

public class Main{

    public static void main(String[] args){
        leftCycle("abcdefs",3);
    }

    public static void leftCycle(String array,int n){
        int index1=0;
        int index2=n-1;
        int index3=n;
        int index4=array.length()-1;
        array=reverse(array,index1,index2);//先对n之前的字符串进行逆置
        array=reverse(array,index3,index4);//同理
        array=reverse(array,index1,index4);
        System.out.println(array);
    }

    public static String reverse(String array,int begin,int end){
        char[] a=array.toCharArray();
        while (begin<end){
            char temp=a[begin];
            a[begin]=a[end];
            a[end]=temp;
            begin++;
            end--;
        }
        return String.copyValueOf(a);
    }
}