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25 Cards in this Set
- Front
- Back
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Polling
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actively sampling the status of an external device by a client program as a synchronous activity.
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Interrupts
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asynchronous signal indicating the need for attention or a synchronous event in software indicating the need for a change in execution.
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Polymorphism
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Subtype polymorphism, almost universally called just polymorphism in the context of object-oriented programming, is the ability to create a variable, a function, or an object that has more than one form.
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3 types of sorting algorithms?
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Bubble sort, insertion sort, merge sort
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Slowest sorting algorithm?
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Bubble sort
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How many times does bubble sort run through data array?
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n-1 times
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Which is the middle-fastest sorting algorithm?
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insertion sort
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How many times does insertion sort run through the array?
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Once
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How does merge sort work?
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Breaks the array into smaller parts, recurses through, sorts, and merges the final result
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Which sorting algorithm is the fastest?
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Merge sort
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What is big O notation?
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It describes the limiting behavior of the function when the argument tends towards a particular value or infinity
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Java code to print a line
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Systm.out.println();
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How do you make a variable or method unchangeable?
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prefix it with "final"
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Instantiate an array of Dog objects called myDogs with 3 elements.
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Dog[] myDogs = new Dog[3]
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Why doesn't this work: while(1)?
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1 is an integer, not a boolean.
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How do you keep a class from being instantiated?
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With the "abstract" keyword
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How do you implement an interface?
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Dog implements Pet. Your class can implement multiple interfaces.
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To invoke the superclass version of a method:
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use the super keyword. E.g.: super.runReport();
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How do you make a window in Java?
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JFrame frame = new JFrame();
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How do you add stuff to a JFrame?
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frame.getContentPane().add(button);
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How do you make a frame visible?
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frame.setVisible(true);
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How do you set the size of a frame?
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frame.setSize(300,300);
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How to get the BufferedReader to read a single character?
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BufferedReader.read();
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How to get the BufferedReader to read a line?
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BufferedReader.readLine();
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How does insertion sort work?
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Works by moving an element to anywhere in the array it should be. Moves through the array once.
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