局部变量操作可能尚未初始化？

Question

在最后6个if语句中，我得到错误“本地变量操作可能尚未初始化”。我不知道它想从我这得到什么。请帮帮我！:(我已经尝试了eclipse建议的修复，并试图自己修复它，但都不起作用...

import java.util.Scanner;
import static java.lang.System.out;

public class test2 {

enum dog {sleeping, eating, peeing, pooping, dead, robot}

public static void main(String args[]) {
    Scanner myScanner = new Scanner(System.in);
    dog action;
    int heartrate;

    out.println("What is the heart rate of your dog? I will be able to tell you what the dog is doing from that information.");
    heartrate = myScanner.nextInt();

    if (heartrate >= 60 || heartrate <= 120) {
        action = dog.sleeping;
    }else if (heartrate == 0) {
        action = dog.dead;
    }else if (heartrate > 500) {
        action = dog.robot;
    }else if (heartrate >= 150 || heartrate <= 200) {
        action = dog.peeing;
    }else if (heartrate >= 150 || heartrate <= 200) {
        action = dog.pooping;
    }else if (heartrate >= 150 || heartrate <= 200) {
        action = dog.eating;
    }
    out.print("Your dog is currently ");
    if (action == dog.sleeping) {
        out.print("sleeping ");
    }
    if (action == dog.dead) {
        out.print("dead ");
    }
    if (action == dog.robot) {
        out.print("a robot.");
    }
    if (action == dog.peeing) {
        out.print("peeing ");
    }
    if (action == dog.pooping) {
        out.print("pooping ");
    }
    if (action == dog.eating) {
        out.print("eating ");
    }
    System.out.println(".");
}
}

Answer 1

在使用该变量之前，必须为其赋值。例如，action不是在所有条件下都初始化的，所以您不能安全地使用它。

一个简单的解决方案是给出一个默认值，如下所示

dog action = dog.dead;

您可以使用一个switch块来代替一系列if(action ==语句。

顺便说一句，你的三个条件是相同的，你的IDE也应该警告你这一点。