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问题描述
public class test {
private Node head;
private class Node{
int p;
Node next;
public Node(int p, Node next) {
this.p = p;
this.next = next;
}
}
public void set() {
set(head);
}
private void set(Node p) {
p = new Node(1, null);
}
public boolean isEmpty() {
return head == null;
}
public static void main(String[] args) {
test a = new test();
a.set();
System.out.println(a.isEmpty());
}
}
set()函数calss set(head),然后我认为p = head ,和私人集(节点p)
如果要初始化头部,但事实是头部没有初始化,所以我知道为什么
the set() fuction calss set(head), then i think p = head, and the private set(Node p)
if to initialize the head, but the fact is that head is not initialized, so i what to know why
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