Define Checked exception
Checked exception: An exception which should be caught locally in the try statement, or propagated through a throws clause stated in the method header.
Real number: It is a number with an integer and a fractional portion. The primitive types double and float are employed to symbolize real numbers.
Inner class: A class defined within an enclosing method or class. We use the word to refer to non-static nested classes.
Pattern: It is a recurring theme in class usage or design. Interfaces like Iterator encapsulate a pattern of admission to the items in a collection, whereas freeing the client from the requirement to know details of the way in which the collection is
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You will need to create a BottomUpTwoThreeFourTree class, with a BottomUpTwoThreeTreeFourTree constructor which keeps no parameters. BottomUpTwoThreeTreeFourTree will require an insert(int x) method, which will insert the value 
If statement: A control structure employed to select between performing or not performing additional actions. if(boolean-expression){ // Statements
Define the term Host system: It is a computer system on which a process is executed or run.
State the term multi tasking.
Package declaration: It is a declaration employed to name a package. This should be the first item in the source file, preceding any import statements. For example, pa
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