Java 请检查这些代码。它不像我预期的那样工作
代码没有像我想的那样工作。我试图重新编码,但仍然无法得到我希望的结果。代码如下:Java 请检查这些代码。它不像我预期的那样工作,java,Java,代码没有像我想的那样工作。我试图重新编码,但仍然无法得到我希望的结果。代码如下: public class Node<T> { private List<Node<T>> children = new ArrayList<Node<T>>(); private Node<T> parent = null; private T data = null; private String a = "
public class Node<T> {
private List<Node<T>> children = new ArrayList<Node<T>>();
private Node<T> parent = null;
private T data = null;
private String a = "";
public Node(T data) { //used to create parent
this.data = data;
}
public Node(T data, Node<T> parent) {
this.parent = parent;
Node<T> child = new Node<T>(data);
this.parent.children.add(child);
}
public Node<T> getParent(Node<T> child){
return child.parent;
}
public List<Node<T>> getChildren() {
return children;
}
public int getSize(){
return children.size();
}
public String toString(){
for(int i=0; i<children.size();i++){
a = a + parent.children.get(i).getData()+ ",";
}
return a ;
}
public T getData() {
return data;
}
}
import java.util.List;
public class main {
public static void main(String[] args) {
Node<String> parentNode = new Node<String>("Parent");
Node<String> childNode1 = new Node<String>("Child 1", parentNode);
Node<String> childNode2 = new Node<String>("Child 2", parentNode);
List<Node<String>> ChildrenOfParents = parentNode.getChildren();
System.out.println(ChildrenOfParents.size());
System.out.println(ChildrenOfParents.toString());
}
}
在这些代码行之后,我想知道为什么ChildrenOfParents.toString不会打印出这些孩子?那些孩子已经加入了ChildrenOfParents对吗?我对java还是新手。请引导我通过代码。我希望制作一个不受家庭成员限制的家谱。例如,如果遵循二叉树,父亲可以有很多儿子,而不是只有两个。谢谢
PS:谢谢你的回答:this.parent.children.addthis使程序工作。但我想知道为什么在调用带参数的构造函数时,第12行的this.parent.children.addchild不起作用?父项的children变量是否会将子项添加到列表中 您需要在第二个构造函数中将子对象添加到父对象中: 导入java.util.ArrayList; 导入java.util.List
public class Node<T> {
private List<Node<T>> children = new ArrayList<Node<T>>();
private Node<T> parent = null;
private T data = null;
public Node(T data) { //used to create parent
this.data = data;
}
public Node(T data, Node<T> parent) {
this.parent = parent;
this.data = data;
this.parent.children.add(this);
}
public Node<T> getParent(Node<T> child) {
return child.parent;
}
public List<Node<T>> getChildren() {
return children;
}
public int getSize() {
return children.size();
}
public String toString() {
String a = "";
for (int i = 0; i < children.size(); i++) {
a = a + children.get(i).getData() + ",";
}
return a;
}
public T getData() {
return data;
}
}
public class NodeApp {
public static void main(String[] args) {
Node<String> parentNode = new Node<String>("Parent");
Node<String> childNode1 = new Node<String>("Child 1", parentNode);
Node<String> childNode2 = new Node<String>("Child 2", parentNode);
System.out.println(parentNode.getSize());
System.out.println(parentNode.toString());
}
}
请检查你的帖子的格式。而您的孩子renofparents.size应该为零。你没有添加任何内容。你没有在列表中添加任何项目。糟糕的标题。重写以总结您的具体技术问题。抱歉。我对StackOverflow和java都还是新手。我为我刚才做的所有坏事道歉。谢谢。我做了一些编辑,但我仍然无法打印出那些孩子。你有什么想法吗?请看实施