roastduck wrote:
instanceof is an operator
判断左边的object是否是右边class的instance

object instanceof class 明白了.

next point

在这个例子中,如果class value 有多个field 例如:

class Value
{
  int i;
  char c;
  //... may be more and more
}

那么在

  public boolean equals(Object that)
  {    
    if (this == that) 
    return true;
    if ( !(that instanceof Value) )
      return false; 
    Value thatValue = (Value) that;
    //return (this.i == thatValue.i); //这里就要作如下修改,right?
    return ((this.i == thatValue.i)&&(this.c == thatValue.c));
  }

是否有更简洁的写法? 毕竟field如果很多的话...最后那个return写起来会很难看的.