java oops interview questions for experienced professionals

Java oops interview questions for experienced professionals how to#
Java oops interview questions for experienced professionals code#
Java oops interview questions for experienced professionals windows#

You can use the object-oriented Hibernate Query Language to generate database-independent queries. Since the Hibernate Framework internally uses a default first-level cache and a second-level cache, it performs fast. It implements specifications of the Java Persistence API for data persistence. With the Hibernate Framework, you can automatically create tables in the database and gather data from multiple tables.

Java oops interview questions for experienced professionals how to#

String str =null String str1='abc' | str.equals) String x ='abc' String y ='abc' x.concat abcĪlso Check: How To Send An After Interview Email

Java oops interview questions for experienced professionals code#

This code results in an infinite loop if the flag is true and the program exists if the flag is false. HashSet shortSet =newHashSet ) 100 try}else}finally Note that the String substring method creates a substring that begins at index start and extends to the character at index end – 1. Then, since the first character index is 0, it will start from o and print until n. The first character is automatically type cast to int. The output of the given statement is ourn. String s3 ='JournalDev' int start =1 char end =5 ) ourn So the given expression is evaluated to âs1 = s2 is:abcâ = âabcâ, which is false. The output of the given statement is false because the + operator has a higher precedence than the = operator. Test yourself by guessing the output of the following code snippets.

Java oops interview questions for experienced professionals windows#

Most computers can handle a JRE, including Macintosh, Linux, Unix, Windows and selective mobile phones.įeatures that make Java programming popular include: As long as your computer has the Java Runtime Environment, you can execute a Java program on your computer. One of the biggest reasons Java is popular among employers is because of its independence. Why Is Java Coding Popular Among Employers Auxiliary Space: O as we have not used any extra space.

Time Complexity: O where N is the length of the input string.

If you want that the answer should be false in the case of an empty string, you can apply this condition in the isStrPalindrome function.

So, according to our program, an empty string will be a palindrome. Also, the special case of the string being empty is not handled separately as the program automatically covers this test case by not including any character of the string.

If this is not done, our answer will not be correct. Corner cases, You Might Miss: It is very important to convert all the alphabets in the String to lowercase.When the sentence is not a palindrome Input: 2 Race, a cAr 2Output: false

When the sentence is a palindrome Input: 2 Race, e cAr 2Output: true This implies that every thread accessing a volatile field will read the variables current value instead of using a cached value. In all versions of Java, the volatile keyword guarantees global ordering on reads and writes to a variable. The volatile keyword basically says to the JVM Warning, this variable may be modified in another Thread. In Java, each thread has its own stack, including its own copy of variables it can access.When the thread is created, it copies the value of all accessible variables into its own stack. public class ThreadId } // Returns the current thread's unique ID, assigning it if necessary public static int get }Įach thread holds an implicit reference to its copy of a thread-local variable as long as the thread is alive and the ThreadLocal instance is accessible after a thread goes away, all of its copies of thread-local instances are subject to garbage collection. A threads id is assigned the first time it invokes ThreadId.get and remains unchanged on subsequent calls. The example below, from the ThreadLocal Javadoc, generates unique identifiers local to each thread. ThreadLocal instances are typically private static fields in classes that wish to associate state with a thread. Each thread that accesses the get or set method of a ThreadLocal instance is accessing its own, independently initialized copy of the variable. Java interview questions and answers for experienced | Live Mock | coding interviewĪ single ThreadLocal instance can store different values for each thread independently.