静态块

package Kuai;

import java.util.Random;

public class Person {
    public static Random r=new Random();

    public static void sayHello(){
        System.out.println("你好吗");}
        //这是静态块；它在加载Person类时被调用
       static{
            System.out.println("听说我只加载一次？");
        }
       public Person(){
           System.out.println("一个Person对象被创建");
      
       
    }
    
}

package Kuai;

public class Test {

    public static void main(String[] args) {
    
        System.out.println("hello");
        
        
        //System.out.println(Person.r.nextInt(50));
        Person p=new Person();
        Person p1=new Person();
        
    }

}