如何修复创建对象时的“错误：找不到符号”？

Question

我不明白为什么我的编译器找不到类，考虑到我不是已经在我的方法中做到了吗？编译器指向以下行：Weightpublic boolean checkWeight`Weight first = new Weight();`和`Weight second = new Weight();`public class Guard {    int stashWeight;    public Guard ( int maxWeight ) {        this.stashWeight = maxWeight;    }    public boolean checkWeight (Weight maxWeight) {        if ( maxWeight.weight >= stashWeight ) {            return true;        } else {            return false;        }    }    public static void main (String[] args ) {        Weight first = new Weight();        first.weight = 3000;        Weight second = new Weight();        second.weight = 120;        Guard grams = new Guard(450);        System.out.println("Officer, can I come in?");        boolean canFirstManGo = grams.checkWeight(first);        System.out.println(canFirstManGo);        System.out.println();        System.out.println("Officer, how about me?");        boolean canSecondManGo = grams.checkWeight(second);        System.out.println(canSecondManGo);    }}

Answer 1

1. 方法参数“maxWeight”的类型为“Weight”，Java无法找到解析程序依赖关系的定义。未能通过类路径找到类将导致错误“找不到符号”。您可能希望定义类“Weight”并将其导入，就像其他人对您所做的那样。

2. 你真的需要“重量”类吗？您只是将通过的论点与“警卫”的stashWeight进行比较。

您的公共方法可以简单地是：

public boolean checkWeight(int maxWeight) {

        return maxWeight >= stashWeight;

}

主方法可以更新为：

public static void main(String[] args) {

    int firstWeight = 3000;

    int secondWeight = 120;

    Guard grams = new Guard(450);

    System.out.println("Officer, can I come in?");

    boolean canFirstManGo = grams.checkWeight(firstWeight);

    System.out.println(canFirstManGo);

    System.out.println();

    System.out.println("Officer, how about me?");

    boolean canSecondManGo = grams.checkWeight(secondWeight);

    System.out.println(canSecondManGo);

}

Answer 2

您的代码中缺少权重类 请参阅以下代码

class Weight {

    public int weight;

    public int getWeight() {

        return weight;

    }

    public void setWeight(int weight) {

        this.weight = weight;

    }

}

public class Guard {

    int stashWeight;

    public Guard(int maxWeight) {

        this.stashWeight = maxWeight;

    }

    public boolean checkWeight(Weight maxWeight) {

        if (maxWeight.weight >= stashWeight) {

            return true;

        } else {

            return false;

        }

    }

    public static void main(String[] args) {

        Weight first = new Weight();

        first.weight = 3000;

        Weight second = new Weight();

        second.weight = 120;

        Guard grams = new Guard(450);

        System.out.println("Officer, can I come in?");

        boolean canFirstManGo = grams.checkWeight(first);

        System.out.println(canFirstManGo);

        System.out.println();

        System.out.println("Officer, how about me?");

        boolean canSecondManGo = grams.checkWeight(second);

        System.out.println(canSecondManGo);

    }

}

输出

**

Officer, can I come in?

true

Officer, how about me?

false

**

Answer 3

你应该像这样定义类：Weight

public class Weight {

    public int weight;

    public int getWeight() {

        return weight;

    }

    public void setWeight(int weight) {

        this.weight = weight;

    }

}

输出：

Officer, can I come in?

true

Officer, how about me?

false

或者使用关键字导入您的类。Weightimport