Java 使用另一个类的变量实现构造函数？

我是一名java初学者，希望得到一些帮助来实现我的构造函数

比如说

public Class WidthLenth {
private double width;
private double length;

public WidthLength(double width, double length) {
this.width = width;
this.length = length;
}

public double getWidth() {
return width;
}

public double getLength() {
return length;
}

在另一节课上

public Class Rectangle {
private WidthLength widthLength <-- there is a uni-directional relationship here
private String color

那么方法呢

public getWidthLenth() {
}

会有用的

---

如何实现此构造函数？

您只需在构造函数中创建一个新的

WidthLength

对象

public Rectangle(double width, double length, String col)
{
    widthLength = new WidthLength(width, length);
    color = col;
}

试试这个：

public Rectangle(double width, double length, String color) {
    this.widthLength = new WidthLength(width, length);
    this.color = color;
}

public WidthLength getWidthLength() {
    return this.widthLength;
}

public Rectangle(double width, double length, String color) {
    this.widthLength = new WidthLength(width, length);
    this.color = color;
}

public WidthLength getWidthLength() {
    return this.widthLength;
}