list的一些使用

if(list!=null){
...
}

if(list!=null || list.isEmpty()){
...
}

1 for (int i = 1; i < list.size(); i++) {
2     item=list.get(i);  
3 }

1 //for- each   
2  for(Object o:list){   
3        system.out.println(o);   
4 } 

1  //迭代器   
2         Iterator it = list.iterator();   
3         while(it.hasNext()){   
4             System.out.println(it.next());   
5         }

//Object数组    
        Object o[];   
        o = list.toArray();   
        for(int i =  0 ; i <o.length;i++){   
            System.out.println(o[i]);   
        } 

//toString   
        System.out.println(list.toString());