Belco Pharma Interview Questions and Answers

String builder is not synchronized, while String buffer is synchronized.

• String builder is faster than String buffer because it is not synchronized.

• String buffer is thread-safe, while String builder is not.

• String builder is preferred for single-threaded applications, while String buffer is preferred for multi-threaded applications.

To select the 3rd highest salary from the employee table, you can use a SQL query with the 'LIMIT' and 'OFFSET' keywords.

• Use a SQL query like 'SELECT salary FROM employee ORDER BY salary DESC LIMIT 1 OFFSET 2' to get the 3rd highest salary.

• The 'ORDER BY' clause sorts the salaries in descending order, 'LIMIT 1' limits the result to 1 row, and 'OFFSET 2' skips the first two rows.

• Make sure to adjust the 'OFFSET' value if you want to find the nth highest salary.

The == operator checks for reference equality, while the equals method checks for value equality in strings.

• Use == to check if two string variables refer to the same object in memory.

• Use equals() method to check if two string variables have the same sequence of characters.

• Example: String str1 = "hello"; String str2 = "hello"; str1 == str2 will return false, but str1.equals(str2) will return true.

Put is used to create or replace a resource, while patch is used to update a resource partially.

• Put is idempotent, meaning multiple identical requests will have the same effect as a single request

• Patch is not idempotent, as multiple identical requests may have different effects

• Put requires the client to send the entire updated resource, while patch only requires the specific changes to be sent

String can be declared using double quotes, single quotes, or the String constructor.

• Declare using double quotes: String str1 = "Hello";

• Declare using single quotes: String str2 = 'World';

• Declare using String constructor: String str3 = new String("Java");