mplement a toString method for the following class that returns a string containing the class name and the names and values of all instance variables.
mplement a toString method for the following class that returns a string containing the class name and the names and values of all instance variables.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Implement a toString method for the following class that returns a string containing the class name and the names and values of all instance variables.
![**Java Class and Method Example: Point Class**
This example demonstrates the creation of a simple Java class called `Point` that represents a point in a 2D space with `x` and `y` coordinates. The class includes a constructor, a method to get a string representation of a point, and a main method to demonstrate its use.
### Code Explanation
#### Left Panel:
- **Method: `toString()`**
- **Purpose**: Returns a string representation of the `Point` object.
- **Implementation**:
1. Initializes a `String` variable named `result` with `"["`.
2. Appends `"x="` and the value of `x` to `result`.
3. Appends `", y="` and the value of `y` to `result`.
4. Appends `"]"` to close the bracket.
5. Returns the constructed `result` string, which represents the `Point` in the format: `[x=1, y=2]`.
#### Right Panel:
- **Class: `Point`**
- Contains two private integer variables, `x` and `y`, representing the coordinates.
- **Constructor: `Point(int x, int y)`**
- Takes two integer arguments to initialize the `x` and `y` variables of the `Point` instance.
- **Main Method: `public static void main(String[] args)`**
- **Purpose**: Demonstrates the creation and display of a `Point` object.
- **Steps**:
1. Uses `Scanner` to read two integers from the standard input.
2. Creates a `Point` object with the input values.
3. Calls the `toString()` method on the `Point` object and prints the result to the console.
This example provides a basic understanding of encapsulating coordinates using a `Point` class in Java and illustrates the use of constructors and the `toString()` method to offer textual representation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1580620b-ec3d-48da-8d5f-e0e1d6dd1757%2F35f49402-0e44-45f9-8bb1-789db299206f%2Fmsd6zn_processed.png&w=3840&q=75)
Transcribed Image Text:**Java Class and Method Example: Point Class**
This example demonstrates the creation of a simple Java class called `Point` that represents a point in a 2D space with `x` and `y` coordinates. The class includes a constructor, a method to get a string representation of a point, and a main method to demonstrate its use.
### Code Explanation
#### Left Panel:
- **Method: `toString()`**
- **Purpose**: Returns a string representation of the `Point` object.
- **Implementation**:
1. Initializes a `String` variable named `result` with `"["`.
2. Appends `"x="` and the value of `x` to `result`.
3. Appends `", y="` and the value of `y` to `result`.
4. Appends `"]"` to close the bracket.
5. Returns the constructed `result` string, which represents the `Point` in the format: `[x=1, y=2]`.
#### Right Panel:
- **Class: `Point`**
- Contains two private integer variables, `x` and `y`, representing the coordinates.
- **Constructor: `Point(int x, int y)`**
- Takes two integer arguments to initialize the `x` and `y` variables of the `Point` instance.
- **Main Method: `public static void main(String[] args)`**
- **Purpose**: Demonstrates the creation and display of a `Point` object.
- **Steps**:
1. Uses `Scanner` to read two integers from the standard input.
2. Creates a `Point` object with the input values.
3. Calls the `toString()` method on the `Point` object and prints the result to the console.
This example provides a basic understanding of encapsulating coordinates using a `Point` class in Java and illustrates the use of constructors and the `toString()` method to offer textual representation.
Expert Solution
Step 1
The toString() method is used to get a String object representing the value of the Class Object.
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