java这个怎么在主类调用方法

回答：这里也只给一个例子作为参考哈

import java.util.*;

public class Test{
    
    public static void main(String[] args){
        
        Student stu1 = new Student("冰冰一号",1,40,"二班","梦境中");
        
        stu1.speak();
        
        System.out.println(new Date());
    }
}

class Student{
    String name;
    int age;
    int grade;
    String classID;       //由于class为关键字，作为属性容易造成冲突
    String address;
    
    void speak(){
        System.out.println(name);
        System.out.println(age);
        System.out.println(grade);
        System.out.println(classID);
        System.out.println(address);
    }
    
    Student(){
        
    }
    
    Student(String n1,int n2,int n3,String n4,String n5){
        name = n1;
        age = n2;
        grade = n3;
        classID = n4;
        address = n5;
    }
}