package?com.imooc.collection;

import?java.util.ArrayList;
import?java.util.Arrays;
import?java.util.List;
import?java.util.Scanner;

public?class?SetTest?{

	public?List<Course>?coursesToSelect;

	public?SetTest()?{
		coursesToSelect?=?new?ArrayList<Course>();
	}

public void testForEach() {

System.out.println("有如下課程待選(通過for each訪問)：");

for (Object obj : coursesToSelect) {

Course cr = (Course) obj;

System.out.println("課程：" + cr.id + ":" + cr.name);

}

}

上面已經使用了Course泛型為什么下面Foreach的時候還要強制轉換