String和StringBuffer、StringBuilder相互转换

String-----StringBuffer

• 通过构造方法：StringBuffer sb = new StringBuffer("abc");
• 通过append方法：StringBuffer sb = new StringBuffer();sb.append("abc");

StringBuffer------String

• 通过构造方法：StringBuffer sb = new StringBuffer("abc");String s = new String(sb);
• 通过toString方法：StringBuffer sb = new StringBuffer("abc");String s = sb.toString();
• 通过subString方法：StringBuffer sb = new StringBuffer("abc");String s = sb.substring(0, sb.length());

String转StringBuilder、StringBuilder转String同理