CodeGym/Help with Java Tasks/what is the error in this code? please help.

Level 3

06.05.2019
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what is the error in this code? please help.

Question about the task

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public class Solution { public static void main(String[] args) { Person Person=new Person (); } public static class Person { String name; int age; int weight; int money; } }

In the Person class, declare the following variables: String name, int age, int weight, int money.
In the main method, create a Person object and store a reference to it in the variable person.

Hint: Use the following construct to create a Person object and assign a reference to that object to the variable person:
VariableType variableName = new TypeOfObjectBeingCreated();

Requirements:

In the Person class, declare a String variable called name.
In the Person class, declare an int variable called age.
In the Person class, declare an int variable called weight.
In the Person class, declare an int variable called money.
In the main method, create a Person object and immediately assign a reference to it to the variable person.
Five variables must be declared.

package com.codegym.task.task02.task0202; /* //<class name> <object name>=new <class name> String name, int age, int weight, int money. Where does a Person come from? VariableType variableName = new TypeOfObjectBeingCreated(); */ public class Solution { public static void main(String[] args) { Person Person=new Person (); } public static class Person { String name; int age; int weight; int money; } }

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Timothy Strong

Level 4 , San Diego, United States

8 October 2019, 04:24

Thanks classmates. Went back to get a better understand what a Reference variable is. The object person is not stored in the variable person. But, a reference to the object is. Maybe, a pointer to a memory location. I appreciate the comment section. Now, I have to understand why there are parenthesis after the newly created object. One student hit the nail on the head. You are trying to create an object in the class Person (thanks again).

KIN SOCHEAT

Level 34 , Phnom Penh, Cambogia

7 May 2019, 09:52

Look here Primitive data types in lesion 2

KIN SOCHEAT

Level 34 , Phnom Penh, Cambogia

7 May 2019, 06:42

Person person = new Person ();

JavaJavaJava

Level 3

7 May 2019, 09:23

thank you so much. One last question: when we create a new object we type it as ----- <class name> <object name> = new <class name> in the above syntax, what is a class? Is it a new class being initialized? Because in the code, the class is "Public class Solution" So my question is - how is Person the class name? If it is a class name, is it a new class or what?

Norbert

Level 16 , Wrocław, Polska

7 May 2019, 09:50

solution

Look at your code from line 15 - this is the class which has name "Person" :) In the future, you will learn that one class is one file (usually).

Barbara

Level 3 , Lisbon, Portugal

6 May 2019, 21:00

solution

be careful with syntax! when you create object /person/ of the class /Person/, class must have a capital P, while the variable doesn't. In java, variables can't start with capital letters. Instead try Person (class) person (variable of the class) = new Person()

JavaJavaJava

Level 3

7 May 2019, 06:10

Khairul

Level 11

6 May 2019, 09:28

solution

Look at the 12th line of your code:

Person Person=new Person ();

Here the variable name you have declared is the same as the Class name 'Person'. Remember, you cannot use a same variable name which is same as the class name in the same file. So if you change variable name from Person to person, your code will work fine. Because Java is case-sensitive, Person and person is two different things in Java. Hope that clears your head. If you have any further questions, don't hesitate to ask.

JavaJavaJava

Level 3

7 May 2019, 09:23

Khairul

Level 11

8 May 2019, 07:25

solution

A class is like a model or blueprint. Once you design a blueprint for a house, you can build a thousand house or ten thousand or as many as houses you want to build using the same design. So a class is nothing but a blueprint or design using which you can build objects that meets your need. Remember that, we can build many houses using the same design or blueprint but the peoples living in each house, the color of wall etc may differ from house to house although each house looks exactly same, has same facilities. So in the syntax:

<class name> <object name> = new <class name>();

here, a new object is being created using the design or blueprint of the class, not another class. Let me clarify it using our house example:

DuplexHouse duplex1 = new DuplexHouse();

here, this line means, create a new house which name is duplex1 using the blueprint of DuplexHouse class. If you need more clarification, read this tutorial: https://codegym.cc/groups/posts/33-getting-started-with-classes-writing-your-own-classes-constructors