Java 中的静态变量，示例
原文:https://www . geesforgeks . org/static-variables-in-Java-with-examples/
当一个变量被声明为静态时，该变量的单个副本被创建并在类级别的所有对象之间共享。静态变量本质上是全局变量。该类的所有实例共享同一个静态变量。
静态变量的要点:
- We can only create static variables at the class level. See here.
- Static blocks and static variables are executed in the order in which they appear in the program.
下面是 java 程序，演示了静态块和静态变量是按照它们在程序中出现的顺序执行的。
// Java program to demonstrate execution
// of static blocks and variables
class Test {
// static variable
static int a = m1();
// static block
static
{
System.out.println("Inside static block");
}
// static method
static int m1()
{
System.out.println("from m1");
return 20;
}
// static method(main !!)
public static void main(String[] args)
{
System.out.println("Value of a : " + a);
System.out.println("from main");
}
}
输出:
from m1
Inside static block
Value of a : 20
from main
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