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29 Cards in this Set
- Front
- Back
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Can a switch statement evaluate decimals? |
No |
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Can a switch statement use relational operators? |
No you can only test for equality using the reality operator "==" |
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What is an indeterminate loop situation? |
Where we do not know in advance how many times we may have to repeat the loop |
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What type of loop is favoured for an indeterminate situation? |
While or do-while |
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What is a determinate loop situation |
We know how many times the loop needs to run |
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What type of loop if preferred for a determinate situation |
For or a counter controlled while |
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What does lcc stand for |
Loop continuation condition |
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How do you get an infinite loop |
When there is no code to eventually cause the loop continuation condition to become false |
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What is a sentinel value |
A value that when entered will cause the lcc to become false and terminate the program |
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What is a do-while loop often used as? |
A data validation loop because it's guaranteed to run at least once |
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When is the for loop used? |
When we know how many times we want the loop to execute |
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What does the continue keyword do? |
Stop the current iteration for the loop and start again |
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What is an array? |
A named set of contiguous memory cells |
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Can you use two different day types within one array? |
No |
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What are these called [] |
Array index operator |
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Are arrays objects? |
Yes, they are declared and instantiated |
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Can you change the size of the array once it has been created? |
No it is immutable |
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What is the shortcut to populate an array? |
{"data", "data1", "data2"...} |
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What will java automatically assign to each element when an array is created? |
The Unicode character of 'u0000' if numeric and NULL if string |
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What happens when you try to read values past the last elements of an array |
Java will throw an exception |
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How can you be sure that a loo won't read beyond the end of an array |
Use the length() method |
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What will happen if you use a less than or equal to operator in a loop lcc containing an array? |
It will send you out of bounds, you should always use the less than operator |
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How does the math.random() method work |
Returns a double value ranging from 0.0 up to 0.99999... |
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How do you get into values from the math.random method |
Multiply and cast ex... int randomInt = (int)(Math.random()*10); |
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Why are arrays homogeneous data structures? |
They can only store data of one type |
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What is an ArrayList? |
An array on steroids |
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How is an ArrayList different than an array |
It is heterogenous and elastic |
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Why is an ArrayList heterogenous |
Because it holds the references to memory addresses of objects instead of the actual objects |
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How is an ArrayList elastic |
If you fill up all the slots, it automatically creates new ones |
