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
  }
}