15-StringBuffer-09-常用对象API(StringBuffer类-特点&添加功能)

package cn.itcast.stringbuffer.demo;public class StringBufferDemo {public static void main(String[] args) {/* * StringBuffer append(data)//往缓冲区添加数据data */stringBufferDemo();}public static void stringBufferDemo() {StringBuffer sb = new StringBuffer();sb.append(4);sb.append(true);System.out.println(sb);}}