Question

取出List中的对象的属性值，该怎么取？

Answer 1

重新写你那个对象的toString()方法就可以了，譬如你那个对象类为Student
class student{
private int id;
private String password;
private String username;

public String toString(){
return id +"," +password + "," + username;
}

}
这样你就可以直接调用
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).toString());
}