Question

我编写了一个用于按功能更改列表值的代码：

package test3;
import unit4.collectionsLib.*;
public class main {

    public static void change (Node<Integer>first) {
        first = new Node<Integer>(12,first);
    }
    public static void main(String[] args) {
        Node<Integer> first = new Node<Integer>(1);
        first = new Node<Integer>(2,first);
        first = new Node<Integer>(3,first);
        Node<Integer> pos = first;
        while (pos!=null) {
            System.out.print(pos.getInfo()+"->");
            pos = pos.getNext();
        }
        System.out.println();
        change(first);
        pos = first;
        while (pos!=null) {
            System.out.print(pos.getInfo()+"->");
            pos = pos.getNext();
        }               
    }        
}

输出是：

  3->2->1->
3->2->1->

如何传递函数中的对象以更改列表？

Answer 1

Java总是按值传递，但你可以这样做。

public class main {

    public static Node<Integer> change(Node<Integer> first)
    {
        return new Node<Integer>(12,first);
    }
    public static void main(String[] args) {
        Node<Integer> first = new Node<Integer>(1);
        first = new Node<Integer>(2,first);
        first = new Node<Integer>(3,first);
        Node <Integer>pos = first;
        while (pos!=null){
            System.out.print(pos.getInfo()+"->");
            pos = pos.getNext();
        }
        System.out.println();
        pos = change(first);
        while (pos!=null){
            System.out.print(pos.getInfo()+"->");
            pos = pos.getNext();
        }

    }

}

如何在java中通过引用传递对象并更改对象vaules？

1 个答案: