Flashcards
Language Enhancements
Cards in this deck (12)
- 1Which are correct Diamond operator? 1. new ArrayList<>(); 2. new HashMap, List>(); 3. new HashMap<>(); 4. new HashMap<<>,<>>()1, 2, 3
- 2What are the prefixes for Octal, Hexadecimal and Binary?0 -- Octal,
0x/0X - Hexadecimal
0b - Binary - 3Rules for literal underscoreYou can add underscores anywhere except at the beginning of a literal, the end of a literal, right before a decimal point, or right after a decimal point.
- 4Six data types that supported by switch statement.int and Integer
byte and Byte
short and Short
char and Character
String
enum values - 5What kind of values can be used in case statements?Compile time constant values which means literals, enum constants, or final constant variables of the same data type
- 6Rule of default statementIf no other case match, the default statement will be executed. If the default statement has no break and followed by other cases, those cases will be executed as well.
- 7Is it correct to say that a try-with-resources statement is only permitted to omit finally statement?No, a try-with-resources statement is permitted to omit both the catch and finally blocks. A traditional try statement must have either or both.
- 8Does it compile?No. It needs to add throws clause to main method to make it compile or the exception need to be caught in the main method.
- 9What order does Java close resource?Java closes resources in the reverse order from which it created them
- 10In where suppressed exceptions apply only to exceptions thrownin the try clause
- 11When are resources are closed in try-and-resourceafter the try clause ends and before any catch/finally clauses
- 12What are the outputs?Close: 2
Close: 1
ex
finally
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- Upgrade to Java SE 8 OCP ( Java SE 6 and all prior versions) Java Programming Flashcards on Language Enhancements, created by Zeyin Lai on 05/12/2016.
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- Zeyin Lai
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