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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 30

    Java Multithreading
    Level 10, Lektion 0
    You've reached Level 30
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  • Notation for binary numbers like 1000100B

    Java Multithreading
    Level 10, Lektion 1
    "Hi, Amigo!" "Hi, Bilaabo!" "I want to tell you a little about different numbering systems." "You've already heard that people use the decimal system. Here are the main facts of this system: 1) 10 digits are used to write numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. 2) The number 543 means 5 hundreds + 4 tens + 3 ones. "This is equivalent to writing 5*100 + 4*10 + 3*1, which can be written as 5*102 + 4*101 + 3*100 ..."
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  • Practice with numbering systems

    Java Multithreading
    Level 10, Lektion 2
    "Hi, Amigo!"
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  • Numeric operators

    Java Multithreading
    Level 10, Lektion 3
    "Hi, Amigo!" "I want to tell you about numeric operators." "Bilaabo already told me!" "Really? Then I'll ask just a couple of questions." "How do you increase a variable by 1? Give me as many options as possible." "Easy ..."
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  • Practice using numerical operators

    Java Multithreading
    Level 10, Lektion 4
    "Hi, Amigo!"
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  • Logical operators

    Java Multithreading
    Level 10, Lektion 5
    "Hi, Amigo!" "Now we'll have a small lesson on logical operators." "What logical operators do you know?" "OR (||), AND (&&), NOT(!)" "Yep. Good job. And do you remember how they work?" "Yes." "OR yields true when at least one operand is true." "AND yields true when both operands are true." "NOT changes true to false, and false to true." "That's right. And in what order are the operators evaluated ..."
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  • Practice using logical operators

    Java Multithreading
    Level 10, Lektion 6
    "Hi, Amigo!"
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  • Bitwise operators (&, XOR, <<, ...)

    Java Multithreading
    Level 10, Lektion 7
    "Hi, Amigo!" "One more little lesson about bitwise operators." "You know that in addition to the logical operators AND (&&), OR (||) and NOT (!), there are also bitwise operators AND (&), OR (|), NOT (~), and XOR(^), right?" "Yep. Bilaabo once gave a very good lesson about this." "Well, about these operators. I've got two things to tell you:" "First, just like logical operators, they can be applied to boolean ..."
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  • Practice using bitwise operators

    Java Multithreading
    Level 10, Lektion 8
    "Hi, Amigo!"
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  • NaN, Infinity

    Java Multithreading
    Level 10, Lektion 9
    "Hi, Amigo!" "Today I'm going to tell you about some interesting things in Java." "Infinity." "In Java, the double type has special values for positive infinity and negative infinity. A positive number divided by 0.0 yields positive infinity, and a negative number — negative infinity. " "These concepts are represented by special Double constants ..."
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  • Practical application (Bit masks, …)

    Java Multithreading
    Level 10, Lektion 10
    "Hi, Amigo!" "I'd also like to talk about bitmasks and XOR." "You already know that numbers consist of bits and you can perform various operations on these bits. A bitmask is a representation of several different logical values (true/false values) as a single integer. In this case, each boolean-value corresponds to a specific bit. Here's how this could be done ..."
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  • Learning to google. (Converting numbers to hexadecimal)

    Java Multithreading
    Level 10, Lektion 11
    "Hi, Amigo!" "Let's continue our lessons on how to google." "Here are some exercises ..."
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