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Alle Quests Java Syntax Java Core Java Multithreading Java Collections JSP und Servlets Module 3. Java Professional Module 4. SQL & Hibernate Module 5. Spring
Alle Level Level 0 Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9 Level 10 Level 11 Level 12 Level 13 Level 14 Level 15 Level 16 Level 17 Level 18 Level 19 Level 20 Level 21 Level 22 Level 23 Level 24 Level 25 Level 26 Level 27 Level 28
  • You've reached Level 23

    Java Multithreading
    Level 3, Lektion 0
    You've reached Level 23
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  • final and other Java keywords

    Java Multithreading
    Level 3, Lektion 1
    "Hi, Amigo!" "Hi, Bilaabo!" "Today I'm going to tell you about several keywords in Java. But I'll start with the most interesting: the keyword final." "You can use the keyword final when declaring a variable, method, or class." "And why do we need final?" "It's pretty simple. If we mark a variable as final, then it becomes unchangeable ..."
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  • Practice using final...

    Java Multithreading
    Level 3, Lektion 2
    "Bilaabo has brought Amigo some tasks ..."
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  • Nested classes

    Java Multithreading
    Level 3, Lektion 3
    "Hi, Amigo!" "Hi, Ellie!" "Today we have a very interesting topic. Today I'm going to tell you about nested classes." "If a class is declared inside another class, then it is a nested class. Non-static nested classes are called inner classes." "Objects of an inner class are nested inside objects of the outer class and can therefore access the outer class's variables ..."
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  • Practice using inner classes

    Java Multithreading
    Level 3, Lektion 4
    "Hi, Amigo! Ready to get started?" "Yeah, give me your inner class tasks already, Diego ..."
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  • Static nested classes

    Java Multithreading
    Level 3, Lektion 5
    "So, topic number two is static nested classes. Remember that non-static nested classes are called inner classes." "Let's wrap our heads around what the word static means in the context of a nested class declaration. What do you think?" "If a variable is declared as static, then only one copy of the variable exists. So, if a nested class is static, then does that mean you can only create one object of that class?"
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  • Practice using static nested classes

    Java Multithreading
    Level 3, Lektion 6
    "Hi, Amigo!" "Yeah, tasks, I know, I know. By the way, Diego, you make great tasks." "Thanks for finally noticing. Here are some more ..."
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  • Anonymous inner classes, and examples

    Java Multithreading
    Level 3, Lektion 7
    "Hi, Amigo!" "But we've already said hello, Ellie!" "Hey, don't argue with your aunt. In the 31st century, if you haven't seen someone for more than half an hour, it's customary to say hello again. So don't give me your attitude!" "Anyway, it's time for another interesting topic: robot reproduction! ..."
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  • Practice using anonymous classes

    Java Multithreading
    Level 3, Lektion 8
    "Who wants tasks on anonymous classes?" "Who could it be but me? Give them to me already. I want to do a little programming ..."
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  • Learning to google. How to find out whether an object has a specific method? getName, getDisplayName, and getPublicName

    Java Multithreading
    Level 3, Lektion 9
    "Hi, Amigo!" "Let's continue our lessons on how to google." "Here are some exercises ..."
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  • Useful links from the Professor — 23

    Java Multithreading
    Level 3, Lektion 10
    "Hi, Amigo! You've coped with new topics and tasks so quickly. But I have a lot of good reading for you today. I think you will benefit from properly examining nested classes once again ..."
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  • Hardware problems

    Java Multithreading
    Level 3, Lektion 11
    "Hi, buddy!" "Ellie came up today and asked: 'Darling, how do I look?" "But I wasn't paying attention, so I said," "«A little boring, but it's no a big deal!»" "You're kidding! ..."
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