java小练习之实现trim方法

package com.atguigu.java1;


public class StringTest2 {
    public String trims(String s){
        int node = s.indexOf(" ") + 1;
        int nodes = s.lastIndexOf(" ") - 1;
        String c = String.valueOf(s.charAt(node));
        String cs = String.valueOf(s.charAt(nodes));
        while(c.equals(" ")){
            node++;
            c = String.valueOf(s.charAt(node));
        }
        while(cs.equals(" ")){
            nodes--;
            cs = String.valueOf(s.charAt(node));
        }
        String news = "";
        for(int i = 0;i <= (nodes - node);i++){
                news += String.valueOf(s.charAt(i + node));
            }
        return news;
    }
    public static void main(String[] args) {
        StringTest2 ss = new StringTest2();
        String s = "  abcdefg  ";
        System.out.println(s.trim());
        System.out.println(ss.trims(s));
    }
}