static关键字详解

代码详解

Person类

public class Person {
    //2:赋初值
    {
        System.out.println("匿名代码块");
    }
    //1:只执行一次
    static{
        System.out.println("静态代码块");
    }
    //3
    public Person(){
        System.out.println("构造方法");
    }

    public static void main(String[] args) {
        Person person = new Person();
        System.out.println("============");
        Person person1 = new Person();
    }
}

Test类

//静态导入包
import static java.lang.Math.random;
import static java.lang.Math.PI;

public class Test {
    public static void main(String[] args) {
        System.out.println(random());
        System.out.println(PI);
    }
}