构造器

package com.constructor;

public class Student {
    //无参数构造器
    public Student(){
        System.out.println("无参数");
    }
    //有参数构造器
    public Student(String name,double score){
        System.out.println("有参数");
    }
}

package com.constructor;

public class Test {
    public static void main(String[] args) {
        Student s=new Student();
        Student s1=new Student("波仔",99);
    }
}