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| Question | Answer |
| Which are correct Diamond operator? 1. new ArrayList<>(); 2. new HashMap<Map<String,Integer>, List<Double>>(); 3. new HashMap<>(); 4. new HashMap<<>,<>>() | 1, 2, 3 |
| What are the prefixes for Octal, Hexadecimal and Binary? | 0 -- Octal, 0x/0X - Hexadecimal 0b - Binary |
| Rules for literal underscore | You 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. |
| Six data types that supported by switch statement. | int and Integer byte and Byte short and Short char and Character String enum values |
| What 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 |
| Rule of default statement | If 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. |
| Is 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. |
| Does 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. |
| What order does Java close resource? | Java closes resources in the reverse order from which it created them |
| In where suppressed exceptions apply only to exceptions thrown | in the try clause |
| When are resources are closed in try-and-resource | after the try clause ends and before any catch/finally clauses |
| What are the outputs? | Close: 2 Close: 1 ex finally |
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