Java Enum Finalize() 方法

java.lang.Enum.finalize() 方法用于表明枚举类不能有 Finalize 方法。

语法

protected final void finalize()

参数

无需参数。

返回值

void 类型。

异常

无。

示例:

在下面的示例中，java.lang.Enum.finalize()方法用于表明枚举类不能有finalize方法。

import java.lang.*;

public class MyClass {
  
  //创建一个枚举
  public enum WeekDay{
    MON("1st"), TUE("2nd"), WED("3rd"), THU("4th"), FRI("5th");

    String day;
    WeekDay(String x) {
      day = x;
    }

    String showDay() {
      return day;
    }
  }

  public static void main(String[] args) {
    
    System.out.println("Enums cannot have finalize methods:");
    MyClass e = new MyClass() {
      protected final void finalize() {}
    }; 

    System.out.println("WeekDay List:");
    for(WeekDay i : WeekDay.values()) {
      System.out.println(i + " is the " + i.showDay() + " day of the week.");
    }
  }
}

上述代码的输出将是:

Enums cannot have finalize methods:
WeekDay List:
MON is the 1st day of the week.
TUE is the 2nd day of the week.
WED is the 3rd day of the week.
THU is the 4th day of the week.
FRI is the 5th day of the week.