请教大神 虚心请教
这是测试页面
package uuu;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
public class ListTest {
private List courseToselect;
public List getCourseToselect() {
return courseToselect;
}
public void setCourseToselect(List courseToselect) {
this.courseToselect = courseToselect;
}
public ListTest(){
this.courseToselect = ArrayList();
}
private List ArrayList() {
// TODO Auto-generated method stub
return null;
}
public void listAdd(){
Course cr1 = new Course("01 ", " JAVA");
courseToselect.add(cr1);
Course temp = (Course)courseToselect.get(0);
System.out.println("添加了课程： "+temp.getId()+temp.getName());
Course cr2 = new Course("02 ", " C语言");
courseToselect.add(0, cr2);
Course temp2 = (Course)courseToselect.get(0);
System.out.println("添加了课程： "+temp2.getId()+temp2.getName());
Course cr3 = new Course("03 ", " 大学数学");
courseToselect.add( cr3);
Course temp3 = (Course)courseToselect.get(2);
System.out.println("添加了课程： "+temp3.getId()+temp3.getName());
Course cr4 = new Course("04 ", " 大学英语");
courseToselect.add(2, cr2);
Course temp4 = (Course)courseToselect.get(2);
System.out.println("添加了课程： "+temp4.getId()+temp4.getName());
Course as[] = {new Course("5 ", " 大学语文"),
new Course("6 ", " 毛概")};
courseToselect.addAll(3,Arrays.asList(as));
Course temp5 = (Course) courseToselect.get(3);
Course temp6 = (Course) courseToselect.get(4);
System.out.println("添加了课程： "+temp5.getId()+temp5.getName()
+temp6.getId()+temp6.getName());
}
public void getcourse(){
Iterator it = courseToselect.iterator();
while (it.hasNext()) {
Course course = (Course) it.next();
System.out.println("添加了如下课程:");
System.out.println(course.getId()+":"+course.getName());
}
}
public static void main(String[] args) {
ListTest lt = new ListTest();
lt.addtest();
}
}
在我所有的属性封装操作以后 调用lt.addtest(); 为什么会报错
出现提示 是 Add cast to'lt'
变成 ((Object) lt).addtest();
请教大神 这一节封装 该怎么写
学生类封装 ：
package uuu;
import java.util.HashSet;
import java.util.Set;
import asd.student;
public class Students {
private String id;
private String name;
private Set courses;
public Students (String id, String name){
this.id = id;
this.name = name;
this.courses = new HashSet();
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set getCourses() {
return courses;
}
public void setCourses(Set courses) {
this.courses = courses;
}
}
课程类封装：
package uuu;
import java.util.List;
public class CourseList {
private String id;
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public CourseList(String id,String name){
this.id = id;
this.name = name;
}
}
拜托诸位大神
