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ListExample.java
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156 lines (136 loc) · 4.86 KB
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package example.JavaCollectionExample;
import java.util.*;
/**
* List 範例
* - 搭配 iterable
* - 搭配 iterator
*
* ----------
* | List |
* ----------
* ＾ ＾
* implements | | implements
* / \
* / \
* ---------- -----------
* |ArrayList | |LinkedList |
* ---------- -----------
*
*
* Reference:
* - https://beginnersbook.com/java-collections-tutorials/
* - https://beginnersbook.com/2013/12/java-arraylist/
* - https://ithelp.ithome.com.tw/articles/10216257
* - https://iter01.com/550657.html
*/
public class ListExample {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<String>();
list.add("TW");
list.add("US");
list.add("HK");
//! 使用foreach物件來歷遍arraylist
for (String obj:list) {
System.out.println(obj);
}
//! 使用iterator物件來歷遍arraylist
Iterator<String> itr = list.iterator();
while (itr.hasNext()) {
System.out.println(itr.next());
}
// FirstList example.
FirstList firstList = new FirstList();
firstList.createListArray();
firstList.createLinkedListByList();
firstList.createLinkedList();
firstList.createList();
// TODO: ArrayList, LinkedList 各自適合使用情境
}
public void forEachArrayList(ArrayList<String> list) {
// using forEach to print the arraylist.
for (String element : list) {
System.out.println(element);
}
}
public void usingIteratorArrayList(ArrayList<String> list) {
// using Iterator class to travel the arraylist.
Iterator<String> itr = list.iterator();
while (itr.hasNext()) {
System.out.println(itr.next());
}
}
public ArrayList<String> list2AnotherList(ArrayList<String> list) {
ArrayList<String> antherList = new ArrayList<String>();
list.forEach(element -> {
antherList.add(element);
});
return antherList;
}
public int getNumberOfElement(ArrayList<String> list) {
return list.size();
}
}
class FirstList {
private List<?> list;
private LinkedList<?> linkedList;
public void createListArray() {
ArrayList<String> list = new ArrayList<String>();
addData(list)
.showDataByForEach(list, "ArrayList");
}
public void createLinkedListByList() {
// 使用 List 去實體化 LinkedList.
List<String> list = new LinkedList<String>();
addData(list)
.showDataByForEach(list, "LinkedList");
}
public void createLinkedList() {
// ! 使用 LinkedList 去實體化 LinkedList. (請注意List, LinkedList差異)
// ? 一開始使用linkedlist去實體化，將會有linkedlist的addFirst, addLast功能。
LinkedList<String> linkedList = new LinkedList<String>();
addData(linkedList)
.showDataByForEach(linkedList, "LinkedList (使用linkedlist實體化)"); // 多載方式
}
// ! 請注意spring寫法通常使用 interface class 方式，統一對接口，實體化則各自呼叫。
public void createList() {
List<String> list = new ArrayList<String>();
addData(list)
.showDataByForEach(list, "list");
}
public FirstList addData(List<String> list) {
list.add("TW");
list.add("US");
list.add("HK");
this.list = list;
return this;
}
public FirstList addData(LinkedList<String> linkedList) {
// TODO: 使用多載方式之後，是否可以結合範型來處理？
// ? Reference: https://www.796t.com/post/NTQ5ZjI=.html
linkedList.add("TW");
linkedList.add("US");
linkedList.add("HK");
linkedList.addFirst("UK");
linkedList.addLast("CN");
this.linkedList = linkedList;
return this;
}
// ! 多載方式
public void showDataByForEach(List<?> list, String listName) {
System.out.println("Class Type: " + list.getClass() + " " + System.identityHashCode(list));
System.out.println("開始執行" + listName + "...");
this.list.forEach(s -> {
System.out.println(s);
});
System.out.println("結束" + listName + "...\n");
}
public void showDataByForEach(LinkedList<?> list, String listName) {
System.out.println("Class Type: " + list.getClass() + " " + System.identityHashCode(list));
System.out.println("開始執行" + listName + "...");
// * you can use "list" to foreach them.
this.linkedList.forEach(s -> {
System.out.println(s);
});
System.out.println("結束" + listName + "...\n");
}
}