3回答

• 

  Hiro丶alex

  2017-03-15 14:10:01

  楼主看下我擅自修改的代码，看看有没有违背楼主的意思，首先我把你的 Iterator it =  CourseToSelect.iterator();改成了TestCourse it =  new TestCourse();然后还有你的一个while循环，我改过后是正常运行了，楼主的循环不知道有没有问题，不过，Iterator it =  CourseToSelect.iterator();改成TestCourse it =  new TestCourse();没错吧，后面的课程我也没看，我要是理解错了，莫怪哈

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• 

  Hiro丶alex

  2017-03-15 14:05:55

  package com.imooc;

  
  

  import java.util.ArrayList;

  import java.util.Arrays;

  import java.util.Iterator;

  import java.util.List;

  
  

  public  class TestCourse {

  public List CourseToSelect;

  public TestCourse(){

  this.CourseToSelect =new ArrayList();

  }

  @SuppressWarnings("unchecked")

  public void TestAdd(){

  Course c1 = new Course("1","数据结构");

  CourseToSelect.add(c1);

  Course temp1 = (Course)CourseToSelect.get(0);

  System.out.println("添加的课程是："+temp1.id+":"+temp1.name);

  Course c2 = new Course("2","C语言");

  CourseToSelect.add(0,c2);

  Course temp2 = (Course)CourseToSelect.get(0);

  System.out.println("添加的课程是："+temp2.id+":"+temp2.name);

  Course[] course1 = {new Course("3","离散数学"),new Course("4","汇编语言")};

  CourseToSelect.addAll(Arrays.asList(course1));

  Course temp3 = (Course)CourseToSelect.get(2);

  Course temp4 = (Course)CourseToSelect.get(3);

  System.out.println("添加的两门课程是："+temp3.id+":"+temp3.name+temp4.id+":"+temp4.name);

  Course[] course2 = {new Course("5","高等数学"),new Course("6","大学英语")};

  CourseToSelect.addAll(2,Arrays.asList(course2));

  Course temp5 = (Course)CourseToSelect.get(2);

  Course temp6 = (Course)CourseToSelect.get(3);

  System.out.println("添加的两门课程是："+temp5.id+":"+temp5.name+temp6.id+":"+temp6.name);

  }

  
  

  public static void main(String[] args){

  TestCourse it =  new TestCourse();//这里提示错误不能对非静态字段 CourseToSelect 进行静态引用

  it.TestAdd();

  }

  }

  
  

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• 

  ziom

  2017-02-15 09:05:44

  代码贴出来看看
  

  0 0