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FETake a deeper look at how to reduce a Stream with José Paumard.
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🚨 THE TRUTH REVEALED:
✅ Q1: The Diamond Problem
Answer: B (Compile Error). If a class implements two interfaces with the same default method signature, the compiler gets confused. You must override the method in the class to tell Java which logic to follow.
✅ Q2: Interface Variables
Answer: B (Compile Error). Every variable in an interface is automatically public static final. You can't change it because it's not an instance variable—it's a global constant.
✅ Q3: Abstract Constructors
Answer: B (AB). A common interview trap! Abstract classes can have constructors. They are called via super() to initialize the parent’s state before the child object is fully created.
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This concept is heavily used in Java 8 features like Streams and functional programming.
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✅ Answer 1: C
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out is declared inside System class as:
public static final PrintStream out;
public → Accessible everywhere
static → Belongs to class, no object required
final → Cannot be reassigned
Type → PrintStream
So out is a static reference variable of type PrintStream, not a method and not an object of System.
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println() is defined inside the PrintStream class.
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out is declared as final.
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