java集合，ArrayList，LinkedList知识点总结

1. @Override
   public String toString() {
   return “Person [name=” + name + “, age=” + age + “]”;
   }

   @Override
   public boolean equals(Object obj) {

   Person p = (Person)obj;
   
   return this.name.equals(p.name) && this.age == p.age;
   

   }

2. Iterator it = list.iterator();
   while (it.hasNext()){
   Person p = it.next();
   System.out.println(p.getName()+”….”+p.getAge());
   //System.out.println(it.next().getName()+”…..”+it.next().getAge());//第二个it.next()指针又向后移动
   }

3. String arr[] = list.toArray(new String [0]);//
   for (int i = 0; i < arr.length; i++) {
   System.out.println(arr[i]);
   }

4. private static void demo1() {
   String arr[] = {“11”,”12”,”13”,”14”,”15”};
   List list = Arrays.asList(arr); //数组加进集合
   System.out.println(list);
   }

5. String arr[] = list.toArray(new String [0]);//
   for (int i = 0; i < arr.length; i++) {
   System.out.println(arr[i]);
   }

6. public static ArrayList getSingle(ArrayList list){

   ArrayList newlist = new ArrayList();
   Iterator it = list.iterator();
   while (it.hasNext()){
       Object ob = it.next();
       if (!newlist.contains(ob)){
           newlist.add(ob);
       }
   }
   return newlist;
   

   }

7. ArrayList