Java Interview Questions and Answers
Question - 151 : - What is a transient variable?
Answer - 151 : - A transient variable is a variable that may not be serialized.
Question - 152 : - Which c ontainers use a border Layout as their default layout?
Answer - 152 : - The window, Frame and Dialog classes use a border layout as their default layout.
Question - 153 : - Why do threads block on I/O?
Answer - 153 : - Threads block on I/O (that is enters the waiting state) so that other threads may execute while the I/O Operation is performed.
Question - 154 : - What is the output from System.out.println("Hello"+null);?
Answer - 154 : - Hellonull
Question - 155 : - What is synchronization and why is it important?
Answer - 155 : - With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one thread to modify a shared object while another thread is in the process of using or updating that object's value. This often leads to significant errors.
Question - 156 : - Can a lock be acquired on a class?
Answer - 156 : - Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object.
Question - 157 : - Is null a keyword?
Answer - 157 : - The null value is not a keyword.
Question - 158 : - What method is used to specify a container's layout?
Answer - 158 : - The setLayout() method is used to specify a container's layout.
Question - 159 : - Which containers use a FlowLayout as their default layout?
Answer - 159 : - The Panel and Applet classes use the FlowLayout as their default layout.
Question - 160 : - What state does a thread enter when it terminates its processing?
Answer - 160 : - When a thread terminates its processing, it enters the dead state.