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17 Cards in this Set
- Front
- Back
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Indexing in an array always starts at:
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0
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The length item in an array refers to a _.
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Public field
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Which of the following statements is true of 2D arrays in java?
1. A 2D array must have the same number of columns in each row 2. A 2D array is a primitive data type in Java, like an int or a double 3. A 2D array is an array of arrays, where each row element contains a reference to a 1D array and thus can have a different number of columns in each row 4. None of the above |
3. A 2D array is an array of arrays, where each row element contains a reference to a 1D array and thus can have a different number of columns in each row
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The length item in a String refers to a_.
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Public method
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All source code in Java must end in a __ suffix.
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.java
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What is an object?
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An instantiation of a class
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An array can store a group of values, but each value must be:
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The same data type
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What relationship does the following specify:
public class MyClass extends YourClass |
MyClass is-a YourClass, or inheritance
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What relationship does the following code specify:
public class MyClass { private String name; } |
MyClass has-a name, or containment
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Given an array declared as (double nums[25];) what is the maximum index value?
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24 (starts at 0)
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How many squares can be referred to by the following 2D array?
Square board = new Square[10][10]; |
100
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If the following 2 method headers shown below, both defined in the same class, what OOP concept is this?
public void print(String str) public void print(Object obj) |
Method overloading: two methods with the same return data type, but different argument
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If an array is initialized as follows, what is stored at myTest[2]
int [] myTest = {5, 10, 15, 20, 25, 30, 35}; |
10
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True or false: Polymorphism is a concept which relies on method overloading.
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FALSE
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What is a mutator method?
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A method that sets the value of a private data attribute
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What does the following logical expression evaluate to?
5 < 6 && 6>8 |
FALSE
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True or False: All classes written in Java inherit from the Object class.
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TRUE
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