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23 Cards in this Set
- Front
- Back
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Variables can hold... (2 things) |
a primitive value or a reference to an object |
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an object is |
an instance of a particular class |
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Methods can return |
values |
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== for comparing strings will compare |
the references |
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when will they be equal |
when string a is made to equal string b |
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garbage |
object with no more valid references |
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new |
key word that crates an object |
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Object that does not require the new operator... |
String |
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Once String object is created can't change |
its value nor is length |
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How can we alter it? |
Return new String objects that are modified versions of original
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class library |
a collection of classes |
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To import all classes in a package use this character |
* |
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wrapper class |
allows you to wrap around int type. Allows you to invoke methods |
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Enumerated lists hold |
all possible values for a variable of that type. |
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autoboxing |
automatic conversion of a primitive value to a corresponding wrapper object. |
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GUI component |
an object that represents a screen element such as a button or a text field. |
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Defined in which packages? |
java.awt and javax.swing |
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GUI container |
a component that is used to hold and organize other components. |
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Frame |
container displayed as a separate window. |
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panel |
used to organize other components |
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heavyweight container |
managed by OS |
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lightweight container |
managed by Java Program |
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Image Icon |
used to represent the image. |
