1.添加功能：public StringBuilder append(任意類型）：字符串類型，布爾類型，整數(shù)類型等等

反轉(zhuǎn)功能：public StringBuilder reserve()

package day01;

//添加功能和反轉(zhuǎn)功能

public class StringBuilderDemo {

public static void main(String[] args) {

//創(chuàng)建對象

StringBuilder sb = new StringBuilder();

//添加功能

sb.append("hello");

sb.append("world");

sb.append("true");

sb.append("100");

System.out.println("sb:"+sb);

//鏈?zhǔn)骄幊?/p>

StringBuilder sb2 = new StringBuilder();

sb2.append("我是中國人").append("漢族").append("來自陜西").append("18歲");

System.out.println("sb2:"+sb2);

//反轉(zhuǎn)功能public StringBuilder reserve()

sb.reverse();

sb2.reverse();

System.out.println("sb:"+sb);

System.out.println("sb2:"+sb2);

}

}

運行結(jié)果：