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Ans. The problem with serialized singleton class is that whenever we deserialize it, it will create a new instance of the class. To overcome this scenario all we need to do is to provide the implementation of readResolve() method.
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Ans. Work with two pointers on the linked list - a slow pointer (increments by one node) and a fast pointer (increments by two nodes). If both of these pointers meet at the same node, then there is a cycle in the linked list. Otherwise, no cycle.
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Q423. There are 8 balls, 7 weigh 100 gms, 1 is defective, there is a weighing scale, any number of balls can be measured at the same time. in how many attempts defective balls can be found out.
Ans. Quick Turnaround Time and Quick Time to Market
No Worry about the infrastructure , low maintenance
Cost only for use , not for reservation.
Multiple small applications instead of one big. Results in better uptime and mainetnability.
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Ans. ClassNotFoundException is an exception that occurs when we try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath.
NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time.
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Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.
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Ans. In Angular Apps, route between pages are performed without rendering the entire page. Url changes are done through routing. Routing in AngularJS is implemented by including <ng-view> or <ui-view> in the index.html page without refreshing the entire page
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Ans. "git init" creates an empty repository or can make an existing directory a git repository while "git clone" first internally calls "git init" to create an empty git repository and then copy the data from the specified remote repository.
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