StringBuilder基础方法和测试

package com.hqyj.api.API;

import java.util.Scanner;

public class TeatAPI {
    public static void main(String[] args) {
        //测试append()方法
       StringBuilder s1=new StringBuilder("sda");
       s1.append("hhhhhhhhhhhhhhhh");
        System.out.println(s1.length());//19
        System.out.println(s1.capacity());//19
        //测试insert()
        StringBuilder s2=new StringBuilder("java");
        s2.insert(3,"ee");//javeea
        System.out.println(s2);
        //测试delete() 从第n个开始 删除到第m个
        StringBuilder s3=new StringBuilder("java");
        System.out.println(s3.delete(2,3));//jaa
        //测试replace() 从开始坐标（不包括）到结束坐标（包括）之间的内容被指定字符串代替
        StringBuilder s4=new StringBuilder("java");
        System.out.println(s4.replace(1,2,"ee"));//jeeva
        //测试reverse()方法
        StringBuilder s5=new StringBuilder("java");
        System.out.println(s5.reverse());//avaj


        //案例2 输入一个字符串 将字符串反向输出
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入一个字符串");
        String str=scanner.nextLine();
        StringBuilder stringBuilder=new StringBuilder(str);
        System.out.println(stringBuilder.reverse());

    }
}