Question

我不是Java方面的专家。因此，当我练习课堂时，我认为如果有这样的机会创建多个对象，那就太好了可能吗？或Ecah时间，我必须声明新对象，如

  Student s2 = new Sudent();
  Student s1 = new Student();

  s1.setInfo("Sujon", 24, 40000, "Software Engineer");
  s2.setInfo("Alam", 25, 35000, "designer");
  s3.setInfo("Fahim", 23, 20000, "Software Engineer");

Answer 1

您知道“设置信息”从概念上讲就是构造函数的工作，对吧？

Student s1 = new Student("Sujon", 24, 40000, "Software Engineer");
Student s2 = new Student("Alam", 25, 35000, "designer");
Student s3 = new Student("Fahim", 23, 20000, "Software Engineer");

Providing Constructors for Your Classes

Answer 2

您可以在同一行上声明多个变量。但是，通常最好在同一行上声明不超过三个变量。然后，每个变量都需要自己的实例化，可以是相同类型的三个不同对象或相同对象。这是一个示例：

Student s1, s2, s3;

// Each variable is instantiated to the same object
s1 = new Student ();
s2 = s1;
s3 = s1;

// Each variable is instantiated to a new object
s1 = new Student ();
s2 = new Student ();
s3 = new Student ();

// Now you can make calls to the objects
s1.setInfo("Sujon", 24, 40000, "Software Engineer");
s2.setInfo("Alam", 25, 35000, "designer");
s3.setInfo("Fahim", 23, 20000, "Software");

但是，对于您的特定示例，您可能想要检查如何使用构造函数，正如Michael在其回答中指出的那样。我认为这正是您想要的。

是否可以通过Java中的单个类声明创建多个对象？

2 个答案: