java - if-then-else 语句不起作用

Question

我有一个主类，如下所示:

class Main {
    public static void main (String[] args) {
        Mobil one = new Mobil ("xxxxxx", "yyyyyy", 00000001, true);
        Mobil two = new Mobil ("yyyyyy", "xxxxxx", 10245624, false);

        one.touchcontrol();
        two.touchcontrol();
        }
}

我有这个 Mobil 类:

class Mobil {
    String type;
    String manufactureat;
    int modellnumber;
    boolean touchtype;

public Mobil (String manufacturer, String inittype, int number, boolean touch) {
        manufacturer = manufactureat;
        inittype = type;
        number = modellnumber;
        touch = touchtype;
}
public void touchcontrol() {
    if (touchtype == false) 
    {
        System.out.println("This model, has not got Touchscreen!");
    }
    else
    {
        System.out.println("This model, has Touchscreen!");
    }
}

但是当我运行程序并调用 one.touchcontrol(); 和 two.touchcontrol(); 时，它显示没有模型具有触摸屏。我不知道我错过了什么。

Answer 1

您需要在构造函数中交换变量赋值。

manufactureat = manufacturer;
type = inittype;
modellnumber = number;
touchtype = touch;

在 Java 中(以及几乎所有其他语言)的变量赋值中，左手将检索右手的值。

另请参阅:

• The Java Tutorials - Language Basics - Assignment operators