Java vanClass 给出找不到符号错误

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已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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我的代码有几个类别，其中包含不同的汽车和一些类别。下面是我的代码，我不知道为什么是 vanClass van;不起作用，因为它基本上是过去有效类(class)的复制粘贴。任何帮助表示赞赏。澄清一下，我只对 autopark 类的最后几行有问题，在这些行中我将 vanClass 启动为 van 并从那里开始。

import java.util.*;

class sedan {
    String make;
    String model;
    String color;
    int year;
    double price;
    boolean fourWD;
    boolean isheavyDuty;
    String carries;

    public sedan(String initMake, String initModel, String initColor, int initYear, double initPrice) {
        make = initMake;
        model = initModel;
        color = initColor;
        year = initYear;
        price = initPrice;
    }

    @Override
    public String toString() {
        String name = "Sedan";
        String main = (color + " " + make + " " + model + " " + name + " (" + year + ") costs $" + price);
        return main;
    }
}

class SUV {

    String make;
    String model;
    String color;
    int year;
    double price;
    boolean fourWD;
    String carries;

    public SUV(String initMake, String initModel, String initColor, int initYear, double initPrice, boolean initFourWD){
        make = initMake;
        model = initModel;
        color = initColor;
        year = initYear;
        price = initPrice;
        fourWD = initFourWD;
    }

    public String toString() {
        String name = "SUV";
        String main = new String();
        if (fourWD) {
            main = ("4WD " + color + " " + make + " " + model + " " + name + " (" + year + ") costs $" + price);
        }
        else {
            main = (color + " " + make + " " + model + " " + name + " (" + year + ") costs $" + price);
        }

        return main;
    }
}

class truckClass {

    String make;
    String model;
    String color;
    int year;
    double price;
    boolean fourWD;
    boolean isheavyDuty;
    String carries;

    public truckClass(String initMake, String initModel, int initYear, double initPrice, boolean initisheavyDuty, String initCarries){
        make = initMake;
        model = initModel;
        year = initYear;
        price = initPrice;
        isheavyDuty = initisheavyDuty;
        carries = initCarries;

    }

    public String toString() {
        String name = "Truck";
        String main = (make + " " + model + " " + name + " (" + year + ") carries" + carries + " costs $" + price);
        return main;
    }

class vanClass {

    String make;
    String model;
    int year;
    double price;
    boolean isCovered;
    String carries;

    public vanClass(String initMake, String initModel, int initYear, double initPrice, boolean initisCovered, String initCarries){
        make = initMake;
        model = initModel;
        year = initYear;
        price = initPrice;
        isCovered = initisCovered;
        carries = initCarries;

    }

    public String toString() {
        String name;
        String main;
        if (isCovered()){
            name = "covered Van";
            String main = (make + " " + model + " " + name + " (" + year + ") carries" + carries + " costs $" + price);
        }
        else {
            name = "Van";
            String main = (make + " " + model + " " + name + " (" + year + ") carries" + carries + " costs $" + price);
        }
        return main;
    }
}






public class autoPark {
    public static void main(String args[]) {
        sedan sedan1; // declaring cars object by name sedan1
        sedan1 = new sedan("Ford" , "Model-1" , "white" , 2015, 20000); // initialising sedan1 using sedan constructor
        System.out.println(sedan1); // printing sedan1 for invoking toString() method

        SUV suv; // declaring cars object by name suv
        suv = new SUV("Ford" , "Model-1" , "white" , 2015, 20000, true); // initialising suv using SUV constructor
        System.out.println(suv); // printing suv for invoking toString() method

        truckClass truck; //declaring cars object by name truck
        truck = new truckClass("Ford" , "Model-1" , 2015, 20000, true, "2"); // initialising truck using truck constructor
        System.out.println(truck); // printing truck for invoking toString() method

        vanClass van;
        van = new vanClass("Ford" , "Model-1" , 2015, 20000, true, "2";
        System.out.println(van);


    }
}

Answer 1

我遇到了 4 个问题

1. 在开始之前缺少 } vanClass
2. van = new vanClass("Ford" , "Model-1" , 2015, 20000, true, "2"); 之后缺少 )
3. isCovered 后多一对括号这是成员数据而不是方法
4. 声明main作为字符串在 toString 内两次方法SUV类

import java.util.*;

class sedan {
    String make;
    String model;
    String color;
    int year;
    double price;
    boolean fourWD;
    boolean isheavyDuty;
    String carries;

    public sedan(String initMake, String initModel, String initColor, int initYear, double initPrice) {
        make = initMake;
        model = initModel;
        color = initColor;
        year = initYear;
        price = initPrice;
    }

    @Override
    public String toString() {
        String name = "Sedan";
        String main = (color + " " + make + " " + model + " " + name + " (" + year + ") costs $" + price);
        return main;
    }
}

class SUV {

    String make;
    String model;
    String color;
    int year;
    double price;
    boolean fourWD;
    String carries;

    public SUV(String initMake, String initModel, String initColor, int initYear, double initPrice, boolean initFourWD){
        make = initMake;
        model = initModel;
        color = initColor;
        year = initYear;
        price = initPrice;
        fourWD = initFourWD;
    }

    public String toString() {
        String name = "SUV";
        String main = new String();
        if (fourWD) {
            main = ("4WD " + color + " " + make + " " + model + " " + name + " (" + year + ") costs $" + price);
        }
        else {
            main = (color + " " + make + " " + model + " " + name + " (" + year + ") costs $" + price);
        }

        return main;
    }
}

class truckClass {

    String make;
    String model;
    String color;
    int year;
    double price;
    boolean fourWD;
    boolean isheavyDuty;
    String carries;

    public truckClass(String initMake, String initModel, int initYear, double initPrice, boolean initisheavyDuty, String initCarries){
        make = initMake;
        model = initModel;
        year = initYear;
        price = initPrice;
        isheavyDuty = initisheavyDuty;
        carries = initCarries;

    }

    public String toString() {
        String name = "Truck";
        String main = (make + " " + model + " " + name + " (" + year + ") carries" + carries + " costs $" + price);
        return main;
    }
}

class vanClass {

    String make;
    String model;
    int year;
    double price;
    boolean isCovered;
    String carries;

    public vanClass(String initMake, String initModel, int initYear, double initPrice, boolean initisCovered, String initCarries){
        make = initMake;
        model = initModel;
        year = initYear;
        price = initPrice;
        isCovered = initisCovered;
        carries = initCarries;

    }

    public String toString() {
        String name;
        String main;
        if (isCovered){
            name = "covered Van";
            main = (make + " " + model + " " + name + " (" + year + ") carries" + carries + " costs $" + price);
        }
        else {
            name = "Van";
            main = (make + " " + model + " " + name + " (" + year + ") carries" + carries + " costs $" + price);
        }
        return main;
    }

}

public class autoPark {
    public static void main(String args[]) {
        sedan sedan1; // declaring cars object by name sedan1
        sedan1 = new sedan("Ford" , "Model-1" , "white" , 2015, 20000); // initialising sedan1 using sedan constructor
        System.out.println(sedan1); // printing sedan1 for invoking toString() method

        SUV suv; // declaring cars object by name suv
        suv = new SUV("Ford" , "Model-1" , "white" , 2015, 20000, true); // initialising suv using SUV constructor
        System.out.println(suv); // printing suv for invoking toString() method

        truckClass truck; // declaring cars object by name truck
        truck = new truckClass("Ford" , "Model-1" , 2015, 20000, true, "2"); // initialising truck using truck constructor
        System.out.println(truck); // printing truck for invoking toString() method

        vanClass van;
        van = new vanClass("Ford" , "Model-1" , 2015, 20000, true, "2");
        System.out.println(van);

    }
}

您需要考虑使用其他人提到的继承。