39 lines
1.0 KiB
Markdown
39 lines
1.0 KiB
Markdown
# 13. Java
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## Overloading vs. overriding
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* Overloading: two methods have the same name, but differ in the type or number of alignments.
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* Overriding: a method shares the same name and function signature as another method in its super class
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## Collection framework
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* ArrayList: dynamically resizing array, growing as you insert elements
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* Vector: similar to ArrayList, but synchronized
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* LinkedList
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* HashMap
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```java
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ArrayList<String> myArr = new ArrayList<String>();
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myArr.add("one");
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myArr.add("two");
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System.out.println(myArr.get(0));
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Vector<String> myVec = new Vector<String>();
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myVec.add("one");
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myVec.add("two");
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System.out.println(myVec.get(0));
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LinkedList<String> myLinkedList = new LinkedList<String>();
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myLinkedList.add("two");
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myLinkedList.addFirst("one");
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Iterator<String> iter = myLinkedList.iterator();
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while (iter.hasNext()) {
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System.out.println(iter.next());
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}
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HashMap<String, String> map = new HashMap<String, String>();
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map.put("one", "uno");
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map.put("two", "dos");
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System.out.println(map.get("one"));
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```
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