請教大神 虛心請教
這是測試頁面
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("添加了課程： "+temp.getId()+temp.getName());
Course cr2 = new Course("02 ", " ?C語言");
courseToselect.add(0, cr2);
Course temp2 = (Course)courseToselect.get(0);
System.out.println("添加了課程： "+temp2.getId()+temp2.getName());
Course cr3 = new Course("03 ", " ?大學(xué)數(shù)學(xué)");
courseToselect.add( cr3);
Course temp3 = (Course)courseToselect.get(2);
System.out.println("添加了課程： "+temp3.getId()+temp3.getName());
Course cr4 = new Course("04 ", " ?大學(xué)英語");
courseToselect.add(2, cr2);
Course temp4 = (Course)courseToselect.get(2);
System.out.println("添加了課程： "+temp4.getId()+temp4.getName());
Course as[] = {new Course("5 ", " ?大學(xué)語文"),
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("添加了課程： "+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("添加了如下課程:");
System.out.println(course.getId()+":"+course.getName());
}
? }
? ?public static void main(String[] args) {
ListTest ?lt = new ListTest();
lt.addtest();
}
}
在我所有的屬性封裝操作以后 ? 調(diào)用lt.addtest(); ?為什么會報錯
出現(xiàn)提示 是 ?Add cast to'lt'
變成??((Object) lt).addtest();
請教大神 ?這一節(jié)封裝 ? 該怎么寫?
學(xué)生類封裝 ：
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;
}
? ?
}
課程類封裝：
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;
? ? }
}
拜托諸位大神
2017-09-07
ListTest 類里沒有?addtest 函數(shù)啊。