Core Java Interviewfragen und Antworten
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Frage 221. Can a Byte object be cast to a double value?
No, an object cannot be cast to a primitive value.
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Frage 222. How is rounding performed under integer division?
The fractional part of the result is truncated. This is known as rounding toward zero.
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Frage 223. What would you use to compare two String variables - the operator == or the method equals()?
I would use the method equals() to compare the values of the Strings and the == to check if two variables point at the same instance of a String object.
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Frage 224. Which non-Unicode letter characters may be used as the first character of an identifier?
The non-Unicode letter characters $ and _ may appear as the first character of an identifier
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Frage 225. What is a hashCode?
hash code value for this object which is unique for every object.
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Am hilfreichsten laut Nutzern:
- How could Java classes direct program messages to the system console, but error messages, say to a file?
- What are the differences between an interface and an abstract class?
- Why would you use a synchronized block vs. synchronized method?
- How can you force garbage collection?
- What are the differences between the methods sleep() and wait()?