我有一个班的学生是
package org.ahmed; public class Student { public Student() { // TODO Auto-generated constructor stub System.out.println("Generated constructor"); } static { // static block System.out.println("Hello world static"); } { // insance block System.out.println("Hello world non static"); } }接着
public class Main { public static void main(String[] args) throws ClassNotFoundException { Class.forName("org.ahmed.Student"); // this line causing static block execution in Student class // Student s; // this line doesn't execute the static block. } }我明白通过使用Class.forClass()我们可以在运行时动态运行任何类。 但在其他情况下，我对静态块有一些疑问。
如果我在我的main方法中使用Class.forClass("org.ahmed.Student") ，那么它执行Student的静态块。 但是，如果我在main方法中声明Student s不执行静态块。 我认为Class.forClass("ClassName")与用变量名声明类相同。
I have one class Student which is
package org.ahmed; public class Student { public Student() { // TODO Auto-generated constructor stub System.out.println("Generated constructor"); } static { // static block System.out.println("Hello world static"); } { // insance block System.out.println("Hello world non static"); } }and then
public class Main { public static void main(String[] args) throws ClassNotFoundException { Class.forName("org.ahmed.Student"); // this line causing static block execution in Student class // Student s; // this line doesn't execute the static block. } }I understand by using Class.forClass() we can dynamically run any class in runtime. But I have some question in other case regarding static block.
If I use Class.forClass("org.ahmed.Student") in my main method, then it's executing the static block of Student. But if I declare Student s in main method its doesn't execute the static block. I thought Class.forClass("ClassName") is same as declaring class with a variable name.
最满意答案
当您使用Class.forName("org.ahmed.Student")您实际上强制JVM加载该类并调用其静态块。 你可以在这里阅读更多。
When you use Class.forName("org.ahmed.Student") you actually force the JVM to load the class and invoke its static blocks. You can read more here.
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