What is the difference between StringBuffer and StringBuilder class?

Java Programming Language > Fundamentals of Object-Oriented Programming > Object-Oriented Paradigm

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Answer:

Use StringBuilder whenever possible because it is faster than StringBuffer. But, if thread safety is necessary then use StringBuffer objects.

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83. Which package is used for pattern matching with regular expressions?

Answer: java.util.regex package is used for this purpose.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

84. java.util.regex consists of which classes?

Answer: java.util.regex consists of three classes ? Pattern class, Matcher class and PatternSyntaxException class.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

85. What is finalize() method?

Answer: It is possible to define a method that will be called just before an object's final destruction by the garbage collector. This method is called finalize( ), and it can be used to ensure that an object terminates cleanly.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

86. What is an Exception?

Answer: An exception is a problem that arises during the execution of a program. Exceptions are caught by handlers positioned along the thread's method invocation stack.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

87. What do you mean by Checked Exceptions?

Answer: It is an exception that is typically a user error or a problem that cannot be foreseen by the programmer. For example, if a file is to be opened, but the file cannot be found, an exception occurs. These exceptions cannot simply be ignored at the time of compilation.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

88. Explain Runtime Exceptions?

Answer: It is an exception that occurs that probably could have been avoided by the programmer. As opposed to checked exceptions, runtime exceptions are ignored at the time of compliation.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

89. Which are the two subclasses under Exception class?

Answer: The Exception class has two main subclasses : IOException class and RuntimeException Class.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

90. When throws keyword is used?

Answer: If a method does not handle a checked exception, the method must declare it using the throwskeyword. The throws keyword appears at the end of a method's signature.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

91. When throw keyword is used?

Answer:

An exception can be thrown, either a newly instantiated one or an exception that you just caught, by using throw keyword.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

92. How finally used under Exception Handling?

Answer: The finally keyword is used to create a block of code that follows a try block. A finally block of code always executes, whether or not an exception has occurred.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

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