Question

public class TestBikes {
public static void main(String[] args){
Bicycle bike01, bike02, bike03;

bike01 = new Bicycle(20, 10, 1);
bike02 = new MountainBike(20, 10, 5, "Dual");
bike03 = new RoadBike(40, 20, 8, 23);

bike01.printDescription();
bike02.printDescription();
bike03.printDescription();
}
}

可以将第3行（Bicycle bike01，bike02，bike03）及其3个实例重写为

Bicycle bike01 = new Bicycle(20, 10, 1);
Bicycle bike02 = new MountainBike(20, 10, 5, "Dual");
Bicycle bike03 = new RoadBike(40, 20, 8, 23);

Answer 1

您似乎在询问是否可以将变量初始化为其声明的一部分，例如：

Bicycle bike01 = new Bicycle(20, 10, 1);

而不是

Bicycle bike01;

bike01 = new Bicycle(20, 10, 1);

是的，你可以这样做，而人们通常会这样做。它不会改变最终的程序。

旁注：当您发现自己编写bike01，bike02等变量名称时，请考虑使用数组或类似名称。

Answer 2

是的当然，在第一种情况下，您只需在第一种情况下定义它们然后初始化它们，但在第二种情况下，您可以同时定义和初始化它们

这被判为调用构造函数吗？

2 个答案: