静态函数与反射

 

@Data
@Builder
@ToString
public class Reflect implements Cloneable{

 public String name ;

 public String age ;

 static {
 System.out.println("Reflect静态块");
 }

 public Reflect() {
 System.out.println("Reflect构造");
 }
 public Reflect(String name,String age) {
 this.age =age;
 this.name=name;
 }
 @Override
 protected Object clone() {
 Reflect reflect = null;
 try {
 reflect = (Reflect) super.clone();
 return reflect;
 } catch (CloneNotSupportedException e) {
 e.printStackTrace();
 }
 return null;
 }
}

public static void main(String[] args) {
    // 不会初始化静态块
 System.out.println("clazz1：------");
 Class clazz1 = Reflect.class;
 System.out.println("clazz2：------");
 // 会初始化
 try {
 Class clazz2 = Class.forName("com.rainbow.dp.Base.Reflect");
 } catch (ClassNotFoundException e) {
 e.printStackTrace();
 }
 System.out.println("clazz3：------");
 try {
 Class clazz3 = Class.forName("com.rainbow.dp.Base.Reflect");
 } catch (ClassNotFoundException e) {
 e.printStackTrace();
 }

 Reflect clazz4 = Reflect.builder().age("16").name("na").build();

 Reflect clazz5 =(Reflect) clazz4.clone();
}

执行结果

clazz1：------
clazz2：------
Reflect静态块
clazz3：------
Reflect构造

以上代码总结两点：

能够看出静态函数在运行时只加载一次

Class.forName 会调用静态块

Reflect.class 不会调用静态块