JAVA EE: Java Tutorial : Java instanceOf Operator

Tuesday 3 November 2015

Java Tutorial : Java instanceOf Operator

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Java Tutorial : Java instanceOf Operator

Employee.java

public interface Employee
{

}

Parent.java

public class Parent implements Employee
{
    private String name;
    private String age;

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public String getAge()
    {
        return age;
    }

    public void setAge(String age)
    {
        this.age = age;
    }

}

Child.java

public class Child extends Parent
{
    private String schoolName;

    public String getSchoolName()
    {
        return schoolName;
    }

    public void setSchoolName(String schoolName)
    {
        this.schoolName = schoolName;
    }

}

InstanceOfOperatorDemo.java

class InstanceOfOperatorDemo
{
    public static void main(String[] args)
    {
        Parent parentObject = new Parent();
        Parent childObject = new Child();

        System.out.println("parentObject instanceof Parent: "
                + (parentObject instanceof Parent));

        System.out.println("parentObject instanceof Child: "
                + (parentObject instanceof Child));

        System.out.println("parentObject instanceof Employee Interface: "
                + (parentObject instanceof Employee));

        System.out.println();
        
        System.out.println("childObject instanceof Parent: "
                + (childObject instanceof Parent));

        System.out.println("childObject instanceof Child: "
                + (childObject instanceof Child));
        
        System.out.println("childObject instanceof Employee Interface: "
                + (childObject instanceof Employee));


    }

}

Output

parentObject instanceof Parent: true
parentObject instanceof Child: false
parentObject instanceof Employee Interface: true

childObject instanceof Parent: true
childObject instanceof Child: true
childObject instanceof Employee Interface: true