说明 Java 继承中的类加载和静态块
原文:https://www . geesforgeks . org/installation-class-loading-and-static-blocks-in-Java-inheritation/
类加载表示读取。类将相应的二进制数据归档存储在方法区。对于每一个。类文件，JVM 会在方法区存储相应的信息。现在将继承合并到类加载中。在 java 继承中，JVM 将首先加载并初始化父类，然后加载并初始化子类。
例
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to Illustrate Class Loading
// Importing input output files
import java.io.*;
// Helper class 1
class A {
// First static block of this class
static
{
// Print message
System.out.println(
"Loading class A 1st static block ");
}
// Second static block of this class
static
{
// Print message
System.out.println(
"Loading class A 2nd static block B.c="
+ B.c);
}
// Third static block of this class
static
{
// Print message
System.out.println(
"Loading class A 3rd static block ");
}
static int a = 50;
A() {}
}
// Helper class 2 extending from
// helper class 1
class B extends A {
static
{
// Print message
System.out.println(
"Loading class B static block A.a=" + A.a);
}
static int c = 100;
}
// Main class
class GFG {
// Main driver method
public static void main(String[] args)
{
// Execution statement in main class
new B();
}
}
Output
Loading class A 1st static block
Loading class A 2nd static block B.c=0
Loading class A 3rd static block
Loading class B static block A.a=50
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