试图用不同类型的节点对象创建具有多个节点的 N 叉树[国家 | 状态等]，我尝试从 -
https://github.com/vivin/GenericTree/blob/master/src/main/java/net/vivin/GenericTreeNode.java
我尝试了以下 -
package com.mycompany.ds;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class GenericTreeNode<T>{
private T data;
private List<GenericTreeNode<? super T>> children;
private GenericTreeNode<? super T> parent;
public GenericTreeNode() {
super();
children = new ArrayList<GenericTreeNode<? super T>>();
}
public GenericTreeNode(T data) {
this();
setData(data);
}
public GenericTreeNode<? super T> getParent() {
return this.parent;
}
public List<GenericTreeNode<? super T>> getChildren() {
return this.children;
}
public int getNumberOfChildren() {
return getChildren().size();
}
public boolean hasChildren() {
return (getNumberOfChildren() > 0);
}
public void setChildren(List<GenericTreeNode<? super T>> children) {
for(GenericTreeNode<? super T> child : children) {
child.parent = this;
}
this.children = children;
}
public void addChild(GenericTreeNode<? super T> child) {
child.parent = this;
children.add(child);
}
public void addChildAt(int index, GenericTreeNode<T> child) throws IndexOutOfBoundsException {
child.parent = this;
children.add(index, child);
}
public void removeChildren() {
this.children = new ArrayList<GenericTreeNode<? super T>>();
}
public void removeChildAt(int index) throws IndexOutOfBoundsException {
children.remove(index);
}
public GenericTreeNode<? super T> getChildAt(int index) throws IndexOutOfBoundsException {
return children.get(index);
}
public T getData() {
return this.data;
}
public void setData(T data) {
this.data = data;
}
public String toString() {
return getData().toString();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
GenericTreeNode<?> other = (GenericTreeNode<?>) obj;
if (data == null) {
if (other.data != null) {
return false;
}
} else if (!data.equals(other.data)) {
return false;
}
return true;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((data == null) ? 0 : data.hashCode());
return result;
}
public String toStringVerbose() {
String stringRepresentation = getData().toString() + ":[";
for (GenericTreeNode<? super T> node : getChildren()) {
stringRepresentation += node.getData().toString() + ", ";
}
//Pattern.DOTALL causes ^ and $ to match. Otherwise it won't. It's retarded.
Pattern pattern = Pattern.compile(", $", Pattern.DOTALL);
Matcher matcher = pattern.matcher(stringRepresentation);
stringRepresentation = matcher.replaceFirst("");
stringRepresentation += "]";
return stringRepresentation;
}
}
但是以下方法中的错误 -
public void setChildren(List<GenericTreeNode<? super T>> children) {
for(GenericTreeNode<? super T> child : children) {
child.parent = this;
}
this.children = children;
}
public void addChild(GenericTreeNode<? super T> child) {
child.parent = this;
children.add(child);
}
错误 -
1 - Type mismatch: cannot convert from GenericTreeNode<T> to GenericTreeNode<? super capture#2-of ? super
T>
2 - Type mismatch: cannot convert from GenericTreeNode<T> to GenericTreeNode<? super capture#4-of ? super
T>
我该如何解决这些问题？