StringBuilder类

public class c01 {
    public static void main(String[] args) {
        StringBuilder sb=new StringBuilder();
        sb.append("aaa").append("bbb").append("ccc");//1.append方法进行一个添加任何类型字符串链式编程
        System.out.println(sb);
        StringBuilder reverse = sb.reverse();//2.进行倒序编程
        System.out.println(sb);
        String string = sb.toString();//3.将SystemBuilder转换为String类
        System.out.println(string);
    }
}