java - 在实例化期间将值传递给对象时我缺少什么？

Question

我刚刚接触java，我理解这些概念之间的关系，但是我试图在实例化过程中将值传递给子对象，但我缺少一些关于这些部分如何组合在一起的信息。为什么我会收到错误以及如何构建我的代码/我缺少什么语法才能创建子实例然后打印该对象的值？

package child;

import static child.Gender.FEMALE;
import static child.Gender.MALE;
public class Child {

    private String name;
    private int age;
    private Gender Gender;

    public void eat(){}

    public void sleep(){}

    public void cry(){}

    public Child main(String name, int age, Gender gender) {
        this.name = name;
        this.age = age;
        this.Gender = Gender;
        return null;
    }


    Child childOne = new Child(String "tom", int 3, Gender MALE);

    System.out.println(childOne);
    //Child childTwo = new Child();
    //Child childThree = new Child("Tammy",1,FEMALE);

}

Answer 1

您混淆了构造函数和 main 方法。

public class Child {
    private String name;
    private int age;
    private Gender gender;

    public void eat(){}

    public void sleep(){}

    public void cry(){}

    public Child (String name, int age, Gender gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    public void main(String[] args) {
        Child childOne = new Child("tom", 3, Gender.MALE);
        System.out.println(childOne);    
    }
}

此外，在调用函数时，不要添加要传递的参数的类型。