Encapsulation best practices in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a private field in a class.

Java

public class Person {
    private String [1];
}

Drag options to blanks, or click blank then click option'

Apublic

BgetName

CPerson

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using public instead of private for fields.

Using method names instead of field names.

The field name is declared private to follow encapsulation best practices.

2fill in blank

medium

Complete the code to create a public getter method for the private field.

Java

public class Person {
    private String name;

    public String [1]() {
        return name;
    }
}

Drag options to blanks, or click blank then click option'

AgetName

BName

CsetName

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the getter method incorrectly.

Using the field name directly as method name.

The getter method is named getName to provide controlled access to the private field name.

3fill in blank

hard

Fix the error in the setter method to properly set the private field.

Java

public class Person {
    private String name;

    public void setName(String [1]) {
        name = [1];
    }
}

Drag options to blanks, or click blank then click option'

AnewName

Bthis.name

Cname

DName

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for parameter and field without this keyword.

Not assigning the parameter value to the field.

The parameter should have a different name like newName to avoid confusion and correctly assign the value to the field.

4fill in blank

hard

Fill both blanks to complete the setter method using the this keyword.

Java

public class Person {
    private String name;

    public void setName(String [1]) {
        [2].name = name;
    }
}

Drag options to blanks, or click blank then click option'

Aname

BnewName

Cthis

DPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Not using this when parameter and field names are the same.

Using class name instead of this.

The parameter is named name and the this keyword is used to refer to the field to avoid confusion.

5fill in blank

hard

Fill all three blanks to create a class with a private field and a getter following encapsulation best practices.

Java

public class Car {
    private String [1];

    public String [2]() {
        return [3];
    }
}

Drag options to blanks, or click blank then click option'

Amodel

BgetModel

DsetModel

Attempts:

3 left

💡 Hint

Common Mistakes

Using public fields instead of private.

Getter method not returning the correct field.

The private field is model. The getter method is getModel which returns the field model.