package Hope;
import java.util.ArrayList;
import java.util.List;
public class ListTest {
public List coursesToSelec;
/* public ListTest(){
this.coursesToSelect = new ArrayList();
}
*/
coursesToSelect = new ArrayList(); //把上面的内容注释掉,换成这段代码为什么不行?
public void addCourse(){
Course cr1 = new Course("离散数学",1);
coursesToSelect.add(cr1);
Course temp = (Course) coursesToSelect.get(0);
System.out.println(temp.name+" "+temp.number);
}
public static void main(String[] args){
ListTest a = new ListTest();
a.addCourse();
}
}
package Hope;
public class Course {
String name;
int number;
public Course(String name,int number){
this.name = name;
this.number = number;
}
}