Java 中链表中的类型不兼容错误

Question

public static Node stringToList(String s) {
    Node<Character> head = new Node<Character>();
    for(int i = 0; i < s.length(); i++) {
    head = new Node<Character>(s.charAt(i), head);
    }
    char c = head.item;      // error line
}

I am trying to convert the char value in the nodes to an integer value and I believe I have found a way to do so. Just want to store the item in nodes to variable c for the time being. And then I got the error message. 
Why am I getting an incompatible types error? And it says "required: character".
// Node class:
public class Node<Item> {
    public Item item;           //as you can see, it a generic class
    public Node<Item> next;
    Node() { 
        item = null; 
        next = null;      
    } 
    Node(Item i) {
        item = i;
        next = null;
    }
    Node(Item i, Node<Item> p) {
        item = i;
        next = p;
    }
}

完整的错误消息： 文件：/Users/Michelle/BigInt.java [行： 11

] 错误：/Users/Michelle/BigInt.java：11： 找到不兼容的类型： java.lang.对象 需要： char

Answer 1

编辑：根据您的新编辑(包括错误消息(，这可能是您正在做的事情

Integer oneBoxed = 1;
char d = (char) oneBoxed; //error... required: char, found: Integer 

你应该做的是

Integer oneBoxed = 1;
char d = (char) oneBoxed.intValue();

使用泛型时要小心，因为您被迫对所有基元进行装箱。

您是新来的，但在提问时请尝试发布更多信息;-(

---原答案---

我相对确定你正在尝试

将装箱
1. 字符转换为装箱整数。或
2. 将带框整数转换为带框字符。

要执行从字符到整数的转换，必须先将它们拆箱。

Integer one = 1;
Character b = one;
    //Error will be
    //
    //required: Character
    //found: Integer

反过来

Character c = 'c';
Integer cInt =  c;
    //Error will be
    //
    //required: Integer
    //found: Character

若要正确转换这些值，需要先将 rValue 拆箱。

Integer one = 1;
Character b = (char) one.intValue();
//Yay! No Error

和

Character c = 'c';
Integer cInt = (int) c.charValue();
//Yay! No Error Again!