Java/J2EE Job Interview Companion by Arulkumaran Kumaraswamipillai

By Arulkumaran Kumaraswamipillai

Four hundred+ Java/J2EE Interview questions with transparent and concise solutions for: task seekers (junior/senior builders, architects, team/technical leads), promoting seekers, pro-active newbies and interviewers. Lulu most sensible a hundred most sensible vendor. elevate your incomes capability by means of studying, making use of and succeeding. research the basics on the subject of Java/J2EE in a simple to appreciate questions and solutions procedure. Covers four hundred+ renowned interview Q&A with plenty of diagrams, examples, code snippets, pass referencing and comparisons. this isn't in basic terms an interview advisor but additionally a short reference consultant, a refresher fabric and a roadmap masking a variety of Java/J2EE similar themes. extra Java J2EE interview questions and solutions & resume assets at http://www.lulu.com/java-success

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Therefore, I/O efficiency should be a high priority for developers looking to optimally increase performance. The basic rules for speeding up I/O performance are ƒ ƒ ƒ Minimize accessing the hard disk. Minimize accessing the underlying operating system. Minimize processing bytes and characters individually. Let us look at some of the techniques to improve I/O performance. CO ƒ Use buffering to minimize disk access and underlying operating system. As shown below, with buffering large chunks of a file are read from a disk and then accessed a byte or character at a time.

Also known as a member variable or a field. A static variable is used in the singleton pattern. (Refer Q51 in Java section). A static variable is used with a final modifier to define constants. Local variables Instance and static variables Local variables have a narrower scope than instance variables. The lifetime of a local variable is determined by execution path and local variables are also known as stack variables because they live on the stack. Refer Q34 for stack & heap. For a local variable, it is illegal for code to fail to assign it a value.

ToString(); } } } // the caller could change the array after calling the constructor. // the caller cannot change the array after calling the constructor. e. e. println("After constructing " + myImmutableRef); Out put: Before constructing Numbers are: 1 2 Java - Fundamentals 40 After constructing Numbers are: 1 5 After constructing Numbers are: 1 2 As you can see in the output that the “MyImmutable” object has been mutated. This is because the object reference gets copied as discussed in Q22 in Java section.

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