java语言基础(56)——String和StringBuffer互转

class StringDemo{public static void main(String[] args){  //String  转 StringBuffer  String s = "hello";  // 方法1  StringBuffer sb = new StringBuffer(s);  // 方法2  StringBuffer sbff = new StringBuffer();  sbff.append(s);  System.out.println(sb);   // hello  System.out.println(sbff); // hello  //StringBuffer 转  String  StringBuffer buffer = new StringBuffer("world");      // 方法1  String str = new String(buffer);  // 方法2  String str1 = buffer.toString();  System.out.println(str); // world  System.out.println(str1);// world}}