Java–不使用对象名直接从构造函数调用非静态成员
原文:https://www . geesforgeks . org/Java-调用-非静态-成员-直接从构造函数-不使用对象名/
Java 是一种面向对象编程语言。我们需要创建对象来访问类内的方法和变量。然而，这并不总是正确的。在讨论 java 中的静态关键字时，我们了解到静态成员是类级别的，无需任何实例就可以直接访问。这里我们将讨论如何在不使用对象名称的情况下访问非静态数据成员，该对象名称让我们比较静态数据成员和非静态数据成员，如下表所示:
| **Static data member** | **Non-static data member** | | --- | --- | | They are declared with the keyword "static". | Each member in Java is a non-static one by default, and there is no "static" keyword in front of it. | | All objects of a class share the same copy of static data members. | Each object of the class has its own non-static data member copy. | | They can be accessed using class names or objects. | Generally accessed through the object of the class. | | Static methods can be called without instances or objects of this class. | Non-static methods can access any static methods and static variables without creating instances of objects. |示例 1: 在没有该类的实例或对象的情况下调用静态数据成员。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program Illustrating Calling Static Data Members
// Without the Instance or object of that class
// Main class
public class GFG {
// Static variable
static int a = 5;
// Method 1
// Static method
static void f()
{
// Print statement whenever static method is called
System.out.println("I am static method");
}
// Method 2
// Main driver method
public static void main(String[] args)
{
// Calling static data members without the
// instance or object of that class.
System.out.println(GFG.a);
// Calling method 1
GFG.f();
}
}
Output
5
I am static method
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