JAVA EE: Java Tutorial : Interfaces in Java

Tuesday 12 January 2016

Java Tutorial : Interfaces in Java

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Java Tutorial : Interfaces in Java

Person.java

interface Person
{
    /*
     * By default variable declared in interface is  public static final
     * (i.e. constant)
     */
    int numberOflegs = 2;
    /*
     * Method signatures have no braces and are terminated 
     * with a semicolon.
     * 
     * By default method declared in interface is public abstract.
     * 
     */
    void walk();
}

Student.java

/*
 * Student class  implements the Person interface
 * and provides implementation of methods defined in the
 * Person Interface.
 */

public class Student implements Person
{

    private String name;

    public Student(String name)
    {
        this.name = name;
    }

    public String getName()
    {
        return name;
    }

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

    @Override
    public void walk()
    {
        System.out.println(name + " Walks slowly with "+numberOflegs + " legs");

    }

}

InterfaceTest.java

public class InterfaceTest
{

    public static void main(String[] args)
    {
        Person personRef = new Student("Peter");
        personRef.walk();
    }

}

Output