Below is Node.java and ProgramNode.java. There is an error in ProgramNode.java, so make sure to fix that error and show the fixed code with the screenshot of the working code. Node.javaimport java.util.HashMap;import java.util.Map;import java.util.Properties; public abstract class Node { private String type; private Map<String, String> properties = new HashMap<>(); public Node(String type) { this.type = type; } public String getType() { return type; } public void addProperty(String key, String value) { properties.put(key, value); } public String getProperty(String key) { return properties.get(key); } public String ToString() {return null;}} ProgramNode.javaimport javax.swing.ActionMap; public class ProgramNode extends Node { private String programName; private int programId; public ProgramNode(String programName, int programId) { this.programName = programName; this.programId = programId; } @Override public String ToString() { return "ProgramNode{" + "programName='" + programName + '\'' + ", programId=" + programId + '}'; } } ```javaimport javax.swing.ActionMap;/** * This set of method will allow the user to declare a private member variable to store the program's name * as a String */public class ProgramNode extends Node { private String programName; /** * This set of method will allow the user to declare a private member variable to store the program's ID * as an int */ private int programId; /** * This set of method will allow the user to create a constructor for ProgramNode that takes a programName * (String) and programId (int) as parameters and initialize the programName and program ID member variable * with the provided value * @param programName * @param programId */ public ProgramNode(String programName, int programId) { this.programName = programName; this.programId = programId; } /** * This set of method will allow the user to override the toString() method to provide a custom string * representation of ProgramNode and return a string containing the programName and programId for debugging * and display purposes */ @Override public String toString() { return "ProgramNode{" + "programName='" + programName + '\'' + ", programId=" + programId + '}'; }}```### Explanation of DiagramThe image contains a section of Java code from a program that deals with managing program details using a class called `ProgramNode`. Below is a detailed breakdown:#### Code Structure- **Imports**: The code imports the `ActionMap` class from `javax.swing`, though it is not used within the provided snippet.- **Class Declaration**: The `ProgramNode` class extends another class called `Node`. The purpose of extending Node implies that it's meant to inherit properties or methods from it.- **Fields**: - `programName`: A private string variable intended to store the name of a program. - `programId`: A private integer variable used to store a unique identifier for a program.#### Constructor- The constructor for `ProgramNode` takes two parameters: a `String` for `programName` and an `int` for `programId`.- The constructor is highlighted with an error indicating that the implicit constructor of `Node` is undefined—suggesting

When designing object-oriented software, it's paramount to ensure that class hierarchies function…

Answered: Node.java import java.util.HashMap;…

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Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Question

Below is Node.java and ProgramNode.java. There is an error in ProgramNode.java, so make sure to fix that error and show the fixed code with the screenshot of the working code.

Node.java

import java.util.HashMap;

import java.util.Map;

import java.util.Properties;

public abstract class Node {

private String type;

private Map<String, String> properties = new HashMap<>();

public Node(String type) {

this.type = type;

}

public String getType() {

return type;

}

public void addProperty(String key, String value) {

properties.put(key, value);

}

public String getProperty(String key) {

return properties.get(key);

}

public String ToString() {

return null;

}

ProgramNode.java

import javax.swing.ActionMap;

public class ProgramNode extends Node {

private String programName;

private int programId;

public ProgramNode(String programName, int programId) {

this.programName = programName;

this.programId = programId;

}

@Override

public String ToString() {

return "ProgramNode{" +

"programName='" + programName + '\'' +

", programId=" + programId +

'}';

}

```java
import javax.swing.ActionMap;

/**
* This set of method will allow the user to declare a private member variable to store the program's name
* as a String
*/
public class ProgramNode extends Node {
private String programName;

/**
* This set of method will allow the user to declare a private member variable to store the program's ID
* as an int
*/
private int programId;

/**
* This set of method will allow the user to create a constructor for ProgramNode that takes a programName
* (String) and programId (int) as parameters and initialize the programName and program ID member variable
* with the provided value
* @param programName
* @param programId
*/
public ProgramNode(String programName, int programId) {
this.programName = programName;
this.programId = programId;
}

/**
* This set of method will allow the user to override the toString() method to provide a custom string
* representation of ProgramNode and return a string containing the programName and programId for debugging
* and display purposes
*/
@Override
public String toString() {
return "ProgramNode{" +
"programName='" + programName + '\'' +
", programId=" + programId +
'}';
}
}
```

### Explanation of Diagram
The image contains a section of Java code from a program that deals with managing program details using a class called `ProgramNode`. Below is a detailed breakdown:

#### Code Structure
- **Imports**: The code imports the `ActionMap` class from `javax.swing`, though it is not used within the provided snippet.
- **Class Declaration**: The `ProgramNode` class extends another class called `Node`. The purpose of extending Node implies that it's meant to inherit properties or methods from it.
- **Fields**:
- `programName`: A private string variable intended to store the name of a program.
- `programId`: A private integer variable used to store a unique identifier for a program.

#### Constructor
- The constructor for `ProgramNode` takes two parameters: a `String` for `programName` and an `int` for `programId`.
- The constructor is highlighted with an error indicating that the implicit constructor of `Node` is undefined—suggesting

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Follow-up Question

There is an error for type in ProgramNode.java. Please fix the error and show the fixed code for ProgramNode.java with the screenshot of the working code.

3 import javax.swing. ActionMap;
4
50 /**This set of method will allow the user to declare a private member variable to store the program's name
6 *as a String
7
*/
8 public class ProgramNode extends Node {
9
private String programName;
10
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160
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-35
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/**This set of method will allow the user to declare a private member variable to store the program's ID
*as an int
*/
private int programId;
/**This set of method will allow the user to create a constructor for ProgramNode that takes a programName
*(String) and programId (int) as parameters and initialize the programName and program ID member variable
*with the provided value
* @param programName
@param programId
*/
public ProgramNode (String programName, int programId) {
super (type);
this.p The field Node is not visible
this.p
7 quick fixes available:
}
/**This se
*represen
*and disp
*/
@Override
public Str
return
Change visibility of 'type' to 'protected'
Replace type with getter
Change to 'getType()'
Create field 'type'
Create parameter 'type'
• Create constant 'type'
Change to 'programName'
Press 'F2' for focus
verride the toString() method to provide a custom string
tring containing the programName and programId for debugging

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Node.java import java.util.HashMap; import java.util.Map; import java.util.Properties; public abstract class Node { private String type; private Map properties = new HashMap<>(); public Node(String type) { this.type = type; }