16.StringBuilder的添加功能和反转功能

StringBuilder的添加功能和反转功能

package com.itheima_02;
/*
 * 添加功能
 * public StringBuilder append(任意类型)：添加数据，并返回自身对象
 * 反转功能
 * public StringBuilder reverse()
 */
public class StringBuilderDemo {
    public static void main(String[] args) {
        //创建对象
        StringBuilder sb = new StringBuilder();
        
        //public StringBuilder append(任意类型)
        //StringBuilder sb2 = sb.append("hello");
        
        /*
        System.out.println("sb："+sb);
        System.out.println("sb2："+sb2);
        System.out.println(sb == sb2);//true
        */
        
        /*
        sb.append("hello");
        sb.append("world");
        sb.append(true);
        sb.append(100);
        */
        
        //链式编程
        sb.append("hello").append(true).append(100);
        
        System.out.println("sb："+sb);
        
        //public StringBuilder reverse()
        sb.reverse();
        System.out.println("sb："+sb);
    }
}