String&StringBuffer类转换

一、String转化为StringBuffer类

方法一：使用StringBuffer类的构造方法，public StringBuffer(String str)
public class Person { public static void main(String[] args) { String str ="hello world"; StringBuffer buf = new StringBuffer(); buf.append(str); System.out.println(buf); } }
方法二:利用StringBuffer类的append()方法
public class Person { public static void main(String[] args) { String str ="hello world"; StringBuffer buf = new StringBuffer(str); System.out.println(buf); } }

二、StringBuffer转化为String

利用StringBuffer类的toString()方法完成
public class Person { public static void main(String[] args) { StringBuffer buf=new StringBuffer(); buf.append("hello world"); String str = buf.toString(); System.out.println(str); } }