学生管理系统 用流保存数据

public static void sava(List list,String str){	
		try {
			ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream(str));
			out.writeObject(list);		
			out.close();
		} catch (Exception e) {
			// TODO: handle exception
		}
		
	}
	
	public static Object load(Object obj,String str){
		if(!new File(str).exists()){
			Tools.pl("没有信息");
			return null;
		}
		try {
			ObjectInputStream in=new ObjectInputStream(new FileInputStream(str));			
			obj= in.readObject();			
			in.close();		
			return obj;
		} catch (Exception e) {
			// TODO: handle exception
			return null;
		}
	}