Setter没有设置类的字段[重复]

Question

我已经尝试了几个小时来找出为什么我的代码为每辆“汽车”输出零“年龄”。在我已经编写了两个类似的代码位并且它们运行良好之前......

class Car {
    public int age;
    public int getAge() {
        return age;
    }
    public void setAge (int a) {
        int age = a;
    }
    public void carAge() {
        if (age == 0) {
            System.out.println("Wow! That car's pretty new!");
        } else if (age < 0) {
            System.out.println("Invalid input");
        }
        else if (age <= 3) {
            System.out.println("Superb! That car's quite new!");
        } else if (age <= 7) {
            System.out.println("The car's not old");
        } else if (age <= 10) {
            System.out.println("You've got to be sure it'll work correctly");
        } else if (age <= 15) {
            System.out.println("That car's a little bit old");
        } else if (age <= 30) {
            System.out.println("Does it really work?!");
        } else if (age <= 100) {
            System.out.println("It must be antique otherwise you shouldn't buy it");
        } else {
            System.out.println("Invalid input");
        }
    }
}

public class CarAgeTest {
    public static void main(String[] args) {
        Car lamborgini = new Car();
        lamborgini.setAge (1);
        Car ferrari = new Car();
        ferrari.setAge (2);
        Car uazpatriot = new Car();
        uazpatriot.setAge (15);
        Car fordm1 = new Car();
        fordm1.setAge (95);
        System.out.println("Lamborgini is " + lamborgini.getAge() + " years old");
        lamborgini.carAge();
        System.out.println("Ferrari is " + ferrari.getAge() + " years old");
        ferrari.carAge();
        System.out.println("UAZ Patriot is " + uazpatriot.getAge() + " years old");
        uazpatriot.carAge();
        System.out.println("Ford model 1 is " + fordm1.getAge() + " years old");
        fordm1.carAge();
    }
}

请帮帮我... 可能它应该在帖子中提供更多细节，但我不知道该放什么更多细节

Answer 1

这是 Java 而不是 JavaScript。问题是，在 setAge 方法中，您将值分配给一个新的（！）年龄变量，而不是类属性“age”。就是这样