java集合中list的用法代码示例

/**
 * 课程类
 * @author lenovo
 *
 */
public class KeCheng {
  public String id;
  public String name;
  public KeCheng(String id,String name){
    this.id = id;
    this.name = name;
  }
}

import java.util.HashSet;
import java.util.Set;
/**
 * 学生类
 * @author lenovo
 *
 */
public class Student {
  public String id;
  public String name;
  public Set kecheng;
  public Student(String id,String name){
    this.id = id;
    this.name = name;
    this.kecheng = new HashSet();
  }
}

/**
 * 备选课程类
 * @author lenovo
 *
 */
public class ListTest {
  //用于存放备选课程的List
  public List beixuan;
  public ListTest(){
    this.beixuan = new ArrayList();
  }
}

/*
   * 用来往beixuan里添加备选课程的方法
   */
  public void kcAdd(){
    //创建一个课程的对象，调用add方法，添加到备选课程的List中
    KeCheng kc = new KeCheng("1","数据结构");
    beixuan.add(kc);
    KeCheng kc2 = new KeCheng("2","C语言");
    beixuan.add(0, kc2);
    KeCheng[] kcArr = {new KeCheng("3","大学语文"),new KeCheng("4","线性代数")};
    beixuan.addAll(Arrays.asList(kcArr));
    KeCheng[] kcArr2 = {new KeCheng("5","艺术设计"),new KeCheng("6","计算机基础")};
    beixuan.addAll(2, Arrays.asList(kcArr2));
  }

/*
   * 使用for循环遍历课程的方法
   */
  public void getKC(){
    int size = beixuan.size();
    System.out.println("使用for遍历课程：");
    for (int i = 0; i < size; i++) {
      KeCheng kc = (KeCheng) beixuan.get(i);
      System.out.println("课程："+kc.id+":"+kc.name+";");
    }
  }

/*
   * 使用Iterator迭代器遍历课程
   */
  public void testIterator(){
    Iterator it = beixuan.iterator();
    System.out.println("使用Iterator遍历课程：");
    while(it.hasNext()){
      KeCheng kc = (KeCheng) it.next();
      System.out.println("课程："+kc.id+":"+kc.name+";");
    }
  }
  /*
   * 使用for each遍历课程
   */
  public void testForeach(){
    System.out.println("使用for each遍历课程：");
    for(Object obj : beixuan){
      KeCheng kc = (KeCheng)obj;
      System.out.println("课程："+kc.id+":"+kc.name+";");
    }
  }

 /*
   * 使用set方法添加课程
   */
   public void testModify(){
     beixuan.set(0, new KeCheng("7","毛概"));
   }

/*
   * 使用remove方法删除课程
   */
  public void testRemove(){
    KeCheng kc = (KeCheng) beixuan.get(0);
    System.out.println("我是课程："+kc.id+":"+kc.name+";即将被删除");
    boolean b = beixuan.remove(kc);
    if(b){
      System.out.println("成功删除课程");
      testForeach();
    }
  }

/*
   * 使用removeAll方法删除课程
   */
  public void testRemoveAll(){
    System.out.println("即将删除4和5位置上的课程");
    KeCheng[] kc = {(KeCheng) beixuan.get(4),(KeCheng) beixuan.get(5)};
    beixuan.removeAll(Arrays.asList(kc));
    System.out.println("课程删除成功");
    testForeach();
  }