JAVA EE: January 2016

Java Tutorial : Java super keyword (Invoke super class default constructor)

Click here to watch in Youtube :
https://www.youtube.com/watch?v=38drYmvwbcM&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java super keyword (Invoke super class default constructor)

SuperClass.java

public class SuperClass
{

    public SuperClass()
    {
        System.out.println("Inside SuperClass default Constructor");
        
    }

}

SubClass.java

public class SubClass extends SuperClass
{

    public SubClass()
    {
        super();
        System.out.println("Inside SubClass default Constructor");
    }

}

SuperTest.java

public class SuperTest
{

    public static void main(String[] args)
    {
        SubClass subClassObj = new SubClass();
    }
}

Output

Inside SuperClass default Constructor
Inside SubClass default Constructor

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/SuperKeywordDemo_invoke_defaultCons_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/SuperKeywordDemo_invoke_defaultCons_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/d8bcbd739d9d2ceaeec7ee56b1959925c6ec69d4/BasicJava/SuperKeywordDemo_invoke_defaultCons_App/?at=master

See also:

Java Tutorial : Java super keyword - Playlist

Click here to watch in Youtube :
https://www.youtube.com/watch?v=dHqMAZtnJIg&list=PLmCsXDGbJHdi1l3WvU202gP-xLb4sfngx

See also:

Java Tutorial : Java super keyword (Access super class members)

Click here to watch in Youtube :
https://www.youtube.com/watch?v=dHqMAZtnJIg&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java super keyword (Access super class members)

Superclass.java

public class Superclass
{
    String name = "Peter";
    public void printMethod()
    {
        System.out.println("Printed in Superclass.");
    }
}

SubClass.java

public class SubClass extends Superclass
{

    String name = "John";

    // overrides printMethod in Superclass
    public void printMethod()
    {
        super.printMethod();
        System.out.println("name : " + name);
        System.out.println("super.name : " + super.name);
        System.out.println("Printed in Subclass");
    }

}

SuperTest.java

public class SuperTest
{

    public static void main(String[] args)
    {
        SubClass subClassObj = new SubClass();
        subClassObj.printMethod();
    }
}

Output

Printed in Superclass.
name : John
super.name : Peter
Printed in Subclass

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/SuperKeywordDemo_Access_Members_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/SuperKeywordDemo_Access_Members_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/d8bcbd739d9d2ceaeec7ee56b1959925c6ec69d4/BasicJava/SuperKeywordDemo_Access_Members_App/?at=master

See also:

Java Tutorial : Java summary of creating and using classess and objects

Click here to watch in Youtube :
https://www.youtube.com/watch?v=LieFUS6tUKg&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java summary of creating and using classess and objects

Java Tutorial : Generate override methods using eclipse

Click here to watch in Youtube :
https://www.youtube.com/watch?v=pFCvveNylmQ&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Generate override methods using eclipse

person.java

public class person
{
    public void walk()
    {
        System.out.println("Walking Slow");
    }
    
    public void eat()
    {
        System.out.println("Eating Slow");
    }
    
}

Employee.java

public class Employee extends person
{

    @Override
    public void walk()
    {
        // TODO Auto-generated method stub
        super.walk();
    }

    @Override
    public void eat()
    {
        // TODO Auto-generated method stub
        super.eat();
    }

    @Override
    public String toString()
    {
        // TODO Auto-generated method stub
        return super.toString();
    }
        
    

}

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/GenerationDemo_Eclipse_override_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenerationDemo_Eclipse_override_App/GenerationDemo

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/d8bcbd739d9d2ceaeec7ee56b1959925c6ec69d4/BasicJava/GenerationDemo_Eclipse_override_App/GenerationDemo/?at=master

See also:

Java Tutorial : Generate hashCode and equals method using eclipse

Click here to watch in Youtube :
https://www.youtube.com/watch?v=mohRInH9h-U&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Generate hashCode and equals method using eclipse

Employee.java

public class Employee
{
    private String name;
    private int age;
    private int salary;

    @Override
    public int hashCode()
    {
        final int prime = 31;
        int result = 1;
        result = prime * result + age;
        result = prime * result
                + ((name == null) ? 0 : name.hashCode());
        result = prime * result + salary;
        return result;
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Employee other = (Employee) obj;
        if (age != other.age)
            return false;
        if (name == null)
        {
            if (other.name != null)
                return false;
        }
        else if (!name.equals(other.name))
            return false;
        if (salary != other.salary)
            return false;
        return true;
    }

}

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/GenerationDemo_Eclipse_hashcode_equals_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenerationDemo_Eclipse_hashcode_equals_App/GenerationDemo

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/d8bcbd739d9d2ceaeec7ee56b1959925c6ec69d4/BasicJava/GenerationDemo_Eclipse_hashcode_equals_App/GenerationDemo/?at=master

See also:

Thursday 28 January 2016

Java Tutorial : Generate toString using eclipse

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https://www.youtube.com/watch?v=L50pb2VU4JI&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Generate toString using eclipse

Employee.java

public class Employee
{
    private String name;
    private int age;
    private int salary;

    @Override
    public String toString()
    {
        return "Employee [name=" + name + ", age=" + age
                + ", salary=" + salary + "]";
    }

}

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/GenerationDemo_Eclipse_toString_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenerationDemo_Eclipse_toString_App/GenerationDemo

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/2ec4ef86a93fffce49e990abd3b81708f562c200/BasicJava/GenerationDemo_Eclipse_toString_App/GenerationDemo/?at=master

See also:

Wednesday 27 January 2016

Java Tutorial : Generate Constructors using eclipse

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https://www.youtube.com/watch?v=NE44_5jrU8o&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Generate Constructors using eclipse

Person.java

public class Person
{
    private String name;
    private int age;

    public Person(String name, int age)
    {
        super();
        this.name = name;
        this.age = age;
    }

}

Employee.java

public class Employee extends Person
{
    private int salary;

    public Employee(String name, int age)
    {
        super(name, age);
        // TODO Auto-generated constructor stub
    }

    public Employee(String name, int age, int salary)
    {
        super(name, age);
        this.salary = salary;
    }

}

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/GenerationDemo_Eclipse_Cons_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenerationDemo_Eclipse_Cons_App/GenerationDemo

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/527ec09d8e1fd3cdfc42e1a5df2ff8d97e615036/BasicJava/GenerationDemo_Eclipse_Cons_App/GenerationDemo/?at=master

See also:

Java Tutorial : Generate Getter and Setter methods using eclipse

Click here to watch in Youtube :
https://www.youtube.com/watch?v=IgaROa01QE8&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Generate Getter and Setter methods using eclipse

Employee.java

public class Employee
{

    private String name;
    private int age;
    private int salary;

    public String getName()
    {
        return name;
    }

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

    public int getAge()
    {
        return age;
    }

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

    public int getSalary()
    {
        return salary;
    }

    public void setSalary(int salary)
    {
        this.salary = salary;
    }

}

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/GenerationDemo_Eclipse_Getter_Setter_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenerationDemo_Eclipse_Getter_Setter_App/GenerationDemo

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/527ec09d8e1fd3cdfc42e1a5df2ff8d97e615036/BasicJava/GenerationDemo_Eclipse_Getter_Setter_App/GenerationDemo/?at=master

See also:

Java Tutorial : Java Operator Overloading

Click here to watch in Youtube :
https://www.youtube.com/watch?v=V3GO5UxnJLc&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java Operator Overloading

OperatorOverloadingTest.java

public class OperatorOverloadingTest
{
    public static void main(String[] args)
    {
        String message = "Welcome" + " John";
        System.out.println("message : " + message);

        int result = 20 + 30;
        System.out.println("Result  : " + result);
    }

}

Output

message : Welcome John
Result  : 50

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/OperatorOverloading_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/OperatorOverloading_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/527ec09d8e1fd3cdfc42e1a5df2ff8d97e615036/BasicJava/OperatorOverloading_App/?at=master

See also:

Java Tutorial : Java Runtime Polymorphism(version2)

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https://www.youtube.com/watch?v=jAfw5OAZkmg&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java Runtime Polymorphism(version2)

Animal.java

class Animal
{
    void whoAmI()
    {
        System.out.println("I am a generic Animal.");
    }
}

class Dog extends Animal
{
    void whoAmI()
    {
        System.out.println("I am a Dog.");
    }
}

class Lion extends Animal
{
    void whoAmI()
    {
        System.out.println("I am a Lion.");
    }
}

class Tiger extends Animal
{
    void whoAmI()
    {
        System.out.println("I am a Tiger.");
    }
}

RunTimePolymorphismDemo.java

public class RunTimePolymorphismDemo
{

    public static void main(String[] args)
    {
        Animal animalRef = new Animal();
        animalRef.whoAmI();

        animalRef = new Dog();
        animalRef.whoAmI();
        
        animalRef = new Lion();
        animalRef.whoAmI();
        
        animalRef = new Tiger();
        animalRef.whoAmI();     
    }

}

Output

I am a generic Animal.
I am a Dog.
I am a Lion.
I am a Tiger.

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/PolymorphismDemo_Runtime_V2_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/PolymorphismDemo_Runtime_V2_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/527ec09d8e1fd3cdfc42e1a5df2ff8d97e615036/BasicJava/PolymorphismDemo_Runtime_V2_App/?at=master

See also: