If-then-else语句不起作用

Question

我有一个主要类，看起来像这样：

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();
        }
}

我有这个美孚课程：

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（以及几乎所有其他语言）中的变量赋值中，左手将检索右手的值。

另见：

• The Java Tutorials - Language Basics - Assignment operators

Answer 2

您错误地将值分配给构造函数中的变量...

public Mobil (String manufacturer, String inittype, int number, boolean touch) {
        manufacturer = manufactureat; // should be  manufactureat = manufacturer;
        inittype = type;               //same problem
        number = modellnumber;         // same here
        touch = touchtype;               // and here
}