Core Java, Spring boot MySQL knowledge String, StringBuffer Difference What is String constant pool Controller and RESTController difference RequestParam and PathVariable Difference What is Spring MVC? Spring Boot? @Qualifier annotation means Explain below each line String s =" Hello "; s+="World"; s.trim() ; System.out.println(s) : ------------- Array given {1,2,3,4,5,6} expected output: 1,3,5 2,4,6