Interview Questions and Answers for 'Unisys' - 3 question(s) found - Order By Newest Q1. Difference between Vector and ArrayList ? Core Java
Ans. Vectors are synchronized whereas Array lists are not. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 35 Companies basic frequent Related Questions What is the difference between ArrayList and LinkedList ? If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ? Difference between HashMap and Hashtable? Difference between TreeMap and HashMap ? Can you provide some implementation of a Dictionary having large number of words ? Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? What is a ConcurrentHashMap ? Collections.sort can only be performed on .. Why HashTable has been deprecated ? Difference beween HashSet and TreeSet ? Q2. Difference between Inner and Outer Join ? Database
Ans. Inner join is the intersection of two tables on a particular columns whereas Outer Join is the Union of two tables. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 4 Companies basic frequent Related Questions What are Inner , Outer , Left and Right Joins in SQL ? What is a self Join and give an example of a self Join ? If Table A has 100 records and Table B has 50 records , how many records will the left join of Table A with Table B generate ? If Table A has 100 records and Table B has 50 records , how many records will the right join of Table A with Table B generate ? If Table A has 0 records and Table B has 50 records , how many records will the equi join of Table generate ? What is Left Outer Join ? Describe SQL Joins create an SQL query across multiple tables involving outer joins Explain Working of joins in sql. This question was recently asked at 'Unisys'.This question is still unanswered. Can you please provide an answer. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Related Questions Difference between == and .equals() ? Why is String immutable in Java ? Explain the scenerios to choose between String , StringBuilder and StringBuffer ? What are the difference between composition and inheritance in Java? Explain OOPs What is a Lambda Expression ? What's its use ? Why Char array is preferred over String for storing password? What are different ways to create String Object? Explain. Does garbage collection guarantee that a program will not run out of memory? What is the difference between final, finally and finalize() ?
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java basic interview question vector arraylist collections synchronization vector vs arraylist 
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