string和stringbuilder的异同,stringbuilder转byte

StringBuilder sb3 = new StringBuilder("hello");String str3 = sb3.toString();StringBuilder sb5 = new StringBuilder(str3);

其中String类型转到StringBuilder类型也可以用

StringBuilder b1=new StringBuilder();StringBuilder b2=new StringBuilder();//将String类型的s1,s2转换为StringBuilder类型b1.append(s1);b2.append(s2);