String 字符串反转

public class StringReverse {

    private String string = "zhangshuai";

    @Test
    public void test(){
        System.out.println(reverse1());
        System.out.println(reverse2());
        System.out.println(reverse3(string));
    }

    /**
     * 利用数组反转
     * @return string
     */
    public String reverse1(){
        char[] chars = string.toCharArray();
        //不是实际长度而是其-1
        int length = chars.length;
        for(int i=0;i