zhangyubishoulin的专栏

String 类是不能被继承的，因为他是被final关键字修饰的。 public final class String implements java.io.Serializable, Comparable<String>, CharSequence { /** The value is used for character storage. */ priv...

测试代码: public static void main(String[] args) { System.out.println (new StringBuilder ().append ("Byte-->>").append ("字节数：").append (Byte.BYTES).append (";位数："). appe...