0121 集合类 ArrayList 的练习

public class Jihe {

    public static void main(String[] args) {
        
        
                ArrayList<String> array = new ArrayList<String>(); 
                
                for(int i =1;i<10;i++){
                    
                    array.add("学习天数："+new Integer(i).toString() ); 
                }
                
                array.add("练习ArrayList");  
            
                System.out.println();

                
                for(String m:array){
                    System.out.println(m);
                }
                
                ArrayList<User> alUser = new ArrayList<User>();
                
                alUser.add(new User("ArrayList的方法有",3));    
            
                for(int i =0;i< alUser.size();i++)
                {
                   User u = alUser.get(i);
                   System.out.println(" "+u.getName()+" "+u.getAge()+" 种");
                    

                }
                
            

    }