List接口及其實現類——ArrayList

package Course;
/**
 * 
 * 課程類
 * @author BloodyDmusic
 *
 */
public class Courses {
	public String id;
	public String name;
	public Courses(String id,String name){
		this.id=id;
		this.name=name;
	}
}

package Course;
/***
 * 學生類
 */
import java.util.HashSet;
import java.util.Set;

public class Student {
	String id;
	String name;
	public Set Couses;
	public Student(){
		this.id=id;
		this.name=name;
		this.Couses=new HashSet();
	}
}

package Course;
/**
 * 備選課程類
 */

import java.util.*;

public class ListText {
	public List coursesToSelect;
/**
 * 
 * 用於存放備選課程的List
 */
	public ListText(){
		this.coursesToSelect=new ArrayList();
	}
	/**
	 * 用於往coursesToSelect中添加備選課程
	 */
	public void textAdd(){
		Courses cr1=new Courses("1","數據結構");
		coursesToSelect.add(cr1);
		Courses temp=(Courses)coursesToSelect.get(0);
		System.out.println("添加了課程："+temp.id+":"+temp.name);
		
		Courses cr2=new Courses("2","C語言");
		coursesToSelect.add(0,cr2);
		Courses temp2=(Courses)coursesToSelect.get(0);
		System.out.println("添加了課程："+temp2.id+":"+temp2.name);
		
		//以下方法會拋出數組下標越界異常
		//Courses cr3=new Courses("3","text");
		//coursesToSelect.add(4,cr3);
		
		Courses[]courses={new Courses("3","離散數學"),new Courses("4","線性代數")}; 
		coursesToSelect.addAll(Arrays.asList(courses));
		Courses temp3=(Courses)coursesToSelect.get(2);
		Courses temp4=(Courses)coursesToSelect.get(3);
		System.out.println("添加了課程:"+temp3.id+":"+temp3.name);
		System.out.println("添加了課程："+temp4.id+":"+temp4.name);
		
		Courses[]courses2={new Courses("5","彙編語言"),new Courses("6","大學英語")}; 
		coursesToSelect.addAll(2,Arrays.asList(courses2));
		Courses temp5=(Courses)coursesToSelect.get(2);
		Courses temp6=(Courses)coursesToSelect.get(3);
		System.out.println("添加了課程:"+temp5.id+":"+temp5.name);
		System.out.println("添加了課程："+temp6.id+":"+temp6.name);
	
	}
	/***
	 * 取得List中元素的方法
	 * @param rags
	 */
	public void testGet(){
		System.out.println("有如下課程待選：");
		int size=coursesToSelect.size();
		for(int i=0;i<size;i++){
		Courses cr=(Courses)coursesToSelect.get(i);
		System.out.println("課程："+cr.id+":"+cr.name);
		}
	}
	/***
	 * 通過迭代器來遍歷List
	 * 只是遍歷不能存儲
	 * @param rags
	 */
	public void textIterator(){
		System.out.println("有如下課程待選：（通過迭代器訪問）");
		Iterator it=coursesToSelect.iterator();
		while(it.hasNext()){
			Courses cr=(Courses)it.next();
			System.out.println("課程："+cr.id+":"+cr.name);
		}
	}
	/***
	 * 通過for each方法訪問集合元素
	 * @param rags
	 */
	public void textForEach(){
		System.out.println("有如下課程待選（通過for each遍歷）：");
		for(Object obj:coursesToSelect){
			Courses cr=(Courses)obj;
			System.out.println("課程："+cr.id+":"+cr.name);
		}
	}
	/***
	 * 修改List中的元素
	 * @param rags
	 */
	public void textModify(){
		coursesToSelect.set(3, new Courses("4","毛概"));
	}
	/***
	 * 刪除List中的元素
	 * @param rags
	 */
/*	public void textRemove(){
		System.out.println("即將刪除四位置上的元素");
		coursesToSelect.remove(4);
		System.out.println("刪除完成");
		textForEach();
	}
*/
	public void textRemoveAll(){
		Courses[]courses={(Courses)coursesToSelect.get(4),(Courses)coursesToSelect.get(5)};
		coursesToSelect.removeAll(Arrays.asList(courses));
		textForEach();
	}
	public static void main(String[]rags){
		ListText it=new ListText();
		it.textAdd();
		it.testGet();
		it.textIterator();
		it.textForEach();
		it.textModify();
		it.textForEach();
		it.textRemoveAll();
	}
}