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如何覆蓋「toString」以使此Scala代碼像下面的Java代碼一樣工作。在Scala枚舉中重寫toString方法
代碼斯卡拉
object BIT extends Enumeration {
type BIT = Value
val ZERO, ONE, ANY = Value
override def toString() =
this match {
case ANY => "x "
case ZERO=> "0 "
case ONE => "1 "
}
}
val b = ONE
println(ONE) // returns ONE
通緝的toString的行爲應該產生相同的輸出下面的Java代碼。
public enum BIT {
ZERO, ONE, ANY;
/** print BIT as 0,1, and X */
public String toString() {
switch (this) {
case ZERO:
return "0 ";
case ONE:
return "1 ";
default://ANY
return "X ";
}
}
}
BIT b = ONE;
System.out.println(b); // returns 1
我想我重寫了錯誤的「toString」方法。