JetBrains Academy: Inheritance - Kamil-Jankowski/Learning-JAVA GitHub Wiki

JetBrains Academy: Inheritance

Employees:

Develop a class hierarchy of employees. The hierarchy should include three classes:

• Employee is the base class. It includes three fields (name, email and experience), one constructor with three arguments and three getters: getName(), getEmail(), getExperience().
• Developer is a subclass. It includes fields from the base class and two additional fields (mainLanguage, skills), one constructor with five arguments and two getters: getMainLanguage(), getSkills().
• DataAnalyst is another subclass. It includes fields from the base class and two additional fields (phd, methods), one constructor with five arguments and two getters: isPhD(), getMethods().

You need to define types of the fields and write suitable constructors. To understand it see the code below.

String[] skills = { "git", "Scala", "JBoss", "UML" };
Developer developer = new Developer("Mary", "[email protected]", 3, "Java", skills);
 
String[] mlMethods = { "neural networks", "decision tree", "bayesian algorithms" };
DataAnalyst analyst = new DataAnalyst("John", "[email protected]", 2, true, mlMethods);

It should work correctly with your class hierarchy. Do not forget to write getters with the specified name (otherwise the test system won't be able to check your solution).

class Employee {

    // fields
    protected String name;
    protected String email;
    protected int experience;
    // constructor
    public Employee(String name, String email, int exp){
        this.name = name;
        this.email = email;
        this.experience = exp;
    }
    // methods
    public String getName(){
        return name;
    }
    public String getEmail(){
        return email;
    }
    public int getExperience(){
        return experience;
    }
}

class Developer extends Employee {

    // fields
    private String mainLanguage;
    private String[] skills;
    // constructor
    public Developer(String name, String email, int exp, String mainLanguage, String[] skills){
        super (name, email, exp);
        this.mainLanguage = mainLanguage;
        this.skills = skills;
    }
    // methods
    public String getMainLanguage(){
        return mainLanguage;    
    }
    public String[] getSkills(){
        return skills;
    }
}

class DataAnalyst extends Employee {

    // fields
    private boolean phd;
    private String[] methods;
    // constructor
    public DataAnalyst(String name, String email, int exp, boolean phd, String[] methods){
        super (name, email, exp);
        this.phd = phd;
        this.methods = methods;
    }
    // methods
    public boolean isPhD(){
        return phd;
    }
    public String[] getMethods(){
        return methods;
    }
}

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