Practice Test -Basic Java

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1. Name the map that should be kept in a multi-threading environment to keep up the natural order of keys?



2. Which of those permits duplicate elements?



3. Select an invalid variable declaration in Java:



4. Which list class is reflected as the most prevalent in a multi-threading environment, considering performance constraint?



5. Which of those is synchronized?



6. Which of those is synchronized?



7. The process of removing errors found in the program is known as:



8. ArrayList implements that of the following?



9. Vector extends that of these?



10. Which of the following can get the number of elements in a one-dimensional array arr?



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