Core java - Interview Questions and Answers for 'A9.com' - 2 question(s) found - Order By Newest Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Frequently asked in HCL Technologies, TCS and Accenture. Q1. What is the difference between final, finally and finalize() ? Core Java
Ans. final - constant variable, objects cannot be de-referenced, restricting method overriding, restricting class sub classing.
finally - handles exception. The finally block is optional and provides a mechanism to clean up regardless of what happens within the try block. Use the finally block to close files or to release other system resources like database connections, statements etc.
finalize() - method helps in garbage collection. A method that is invoked before an object is discarded by the garbage collector, allowing it to clean up its state. Sample Code for final Sample Code for finally Sample Code for finalize Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  java   oops   final   finally   finalize   final vs finally vs finalize Asked in 61 Companies basic   frequent Try 4 Question(s) TestRelated Questions Difference between final and effectively final ? Why is effectively final even required ? Which of the following combination of keywords is illegal in Java ?
a. static and transient
b. transient and final
c. static and synchronized
d. abstract and final Which keyword is used to provide explicit access of a code block to single thread ?
a. Transient
b. Final
c. Explicit
d. Synchronized What is a final method ? Enums cannot be declared .. What is a Final Variable ? Should we override finalize method ? Can we override compareTo method for Enumerations ? enums are intrinsically .. Q2. Write a program to print the index of the first non repeated character in a java string Core Java
Ans. public class BuggyBread1{
public static void main (String args[]) {
String str = "hheello world";
char[] charArray = str.toCharArray();
char selectedChar = 'a';
for(char char1: charArray){
if(!str.contains(Character.toString(char1).concat(Character.toString(char1)))){
selectedChar = char1;
break;
}
}
System.out.println(str.indexOf(Character.toString(selectedChar)));
}
} Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  string  code  coding Asked in 9 Companies Related Questions Which keyword is used to provide explicit access of a code block to single thread ?
a. Transient
b. Final
c. Explicit
d. Synchronized How does volatile affect code optimization by compiler? Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? What is the difference between the following two code lines ?
1. new OuterClass().new InnerClass();
2. new OuterClass.InnerClass(); Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object? If arrays cannot be resized , Why is this code valid
String[] strArray = new String[2];
strArray = new String[5]; If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ? Which of the following is not the advantage of Mocking frameworks ? How can we make sure that a code segment gets executed even in case of uncatched exceptions ? Will the static block be executed in the following code ? Why ?