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Q1984. If we try to add duplicate key to the HashMap, What will happen ?
a. It will throw an exception. b. It won't add the new Element without any exception. c. The new element will replace the existing element. d. Compiler will identify the problem and will throw an error.
Ans. The new element will replace the existing element.
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a. HashMap came before HashTable. b. HashMap allows null values whereas Hashtable doesn’t allow null values. c. HashTable and HashMap allow Key-Value pairs. d. Hashtable is synchronized whereas HashMap is not.
Ans. HashMap came before HashTable.
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Q1993. Which of the following is fastest to locate the DOM element ?
a. document.getElementById b. document.getElementByName c. document.ElementName.SubElementName d. They all result in similar performance in retrieving the DOM element.
Ans. document.ElementName.SubElementName
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Q1995. Why should we have Javascript method definitions within HTML Head section ?
a. Its safe to have javascript code within head section b. Head section gets loaded even if there is any error in loading HTML page c. Head section gets executed first and hence assure that js method definition will be loaded before they are called d. So that we can have method definition and method call at the same place
Ans. Head section gets executed first and hence assure that js method definition will be loaded before they are called
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Q2004. Which of the following is dependency exclusion ?
a. A doesn't depend on C and then A marks C as excluded. b. A Depends on B and B depends on C and then A can mark B as excluded. c. A and B depends on C and then they can mark C as excluded. d. A depends upon B and B depends upon C then A marks C as excluded.
a. try block followed by catch b. try block followed by finally c. try block followed by catch block and then finally d. try block without catch or finally block
Ans. try block without catch or finally block
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try block followed by catch block and then finally
try block without catch or finally block
Q2007. Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ?
a. Only one object can be created for Singleton class whereas No objects are created for static class. b. Singleton class instance is initiated using new keyword whereas static class instance is created using static method. c. Singleton class can be serialized whereas Static class cannot be. d. Singleton Class can participate in runtime Polymorphism whereas Static class cannot.
Ans. Singleton class instance is initiated using new keyword whereas static class instance is created using static method.
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Q2010. Which of the following is not true for final variables ?
a. They cannot be changed after initialization b. They can be initialized within static method c. They can be declared and initialized together at the same place d. They can be initialized within constructor
Ans. They can be initialized within static method
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In what order the elements of a HashSet are retrieved ?
