思想
可以理解为树，类中维护节点集合；
描述
又叫部分-整体模式，一个节点类，内有子节点对象（类型也是节点类类型，可能是个列表）
适用
处理类似树型结构的问题时比较方便
示例
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| class TreeNode{
private String name;
private TreeNode parent;
private Vector<TreeNode> children = new Vector<TreeNode>();
public TreeNode(String name){
this.name = name;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public TreeNode getParent(){
return parent;
}
public void setParent(TreeNode parent){
this.parent = parent;
}
public void add(TreeNode node){
children.add(node);
}
public void remove(TreeNode node){
children.remove(node);
}
public Enumeration<TreeNode> getChildren(){
return children.elements();
}
}
public class Test {
public static void printMsg(String msg){
System.out.println(msg);
}
TreeNode root = null;
public Test(String name){
root = new TreeNode(name);
}
public static void main(String[] args){
Test tree = new Test("A");
TreeNode node_b = new TreeNode("B");
TreeNode node_c = new TreeNode("C");
node_b.add(node_c);
tree.root.add(node_b);
Test.printMsg("build tree");
}
}
|