public class binarytree
class treenode
public string getdata()
public void setdata(string data)
public treenode getleftnode()
public void setleftnode(treenode leftnode)
public treenode getrightnode()
public void setrightnode(treenode rightnode)
} public static void main(string args)
public treenode init()
public void xianiterator(treenode node)
if (node.getrightnode() != null)
} public void zhongiterator(treenode node)
this.printnode(node);
if (node.getrightnode() != null)
} public void houiterator(treenode node)
if (node.getrightnode() != null)
this.printnode(node);
}}
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