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import java.awt.*;
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import javax.swing.*;
class TreeDemo extends JFrame
{
public TreeDemo()
{
setSize(400,300);
setTitle("演示怎样使用JTree");
show();
JScrollPane jPanel=new JScrollPane();
getContentPane().add(jPanel);
JTree jtree=new JTree();
jPanel.getViewport().add(jtree,null);
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
public class Example5_25
{
public static void main(String[] args)
{
TreeDemo frame=new TreeDemo();
}
}
其中JScrollPane是一个带滚动条的面板类。
将对象加入到带滚动条的面板类中，在将已建的数放入到其中。
就可建立一个系统默认的树结构。
import java.util.Stack;//导入栈包
public class newtree {
private newtree lchild;// 声明数据成员
private newtree rchild;
private char data;
private newtree root;
public newtree(newtree l, newtree r, char data) {// 有参构造函数进行成员赋值
lchild = l;
rchild = r;
this.data = data;
}
public newtree() {// 无参构造函数创建树
newtree f = new newtree(null, null, 'f');
newtree g = new newtree(null, null, 'g');
newtree d = new newtree(null, null, 'd');
newtree e = new newtree(null, null, 'e');
newtree b = new newtree(d, e, 'b');
newtree c = new newtree(f, g, 'c');
newtree a = new newtree(b, c, 'a');
this.root=a;
}
public void visit(newtree p) {/* 输出数据 */
System.out.print(p.data);// 访问结点
}
@SuppressWarnings("unchecked")
public void InOrder() {/* 输入数据 */
newtree p=this.root;//你建了一棵树要把根节点赋值进去啊
Stack s = new Stack();
while (p != null || !s.isEmpty()) /* 处理数据：进行中序遍历 */
{
if (p != null) {
s.push(p);
p = p.lchild;
} else {
p = (newtree) s.pop();
p.visit(p);//this指的是当前的类对象
p = p.rchild;
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
newtree h = new newtree();// 声明变量，变量赋值
h.InOrder();
}
}
//根据你的代码改了一个
import java.util.Stack;//导入栈包
public class newtree {
public Tree createTree() {// 无参构造函数创建树
Tree f = new Tree(null, null, 'f');
Tree g = new Tree(null, null, 'g');
Tree d = new Tree(null, null, 'd');
Tree e = new Tree(null, null, 'e');
Tree b = new Tree(d, e, 'b');
Tree c = new Tree(f, g, 'c');
Tree a = new Tree(b, c, 'a');
return a;
}
public void InOrder(Tree p) {/* 输入数据 */
StackTree s = new StackTree();
while (p != null || !s.isEmpty()) { /* 处理数据：进行中序遍历 */
if (p != null) {
s.push(p);
p = p.lchild;
} else {
p = s.pop();
System.out.print(p.data);
p = p.rchild;
}
}
}
public void inOrder1(Tree p) {
if (p == null)
return;
inOrder1(p.lchild);
System.out.print(p.data);
inOrder1(p.rchild);
}
public static void main(String[] args) {
newtree h = new newtree();// 声明变量，变量赋值
h.InOrder(h.createTree());
System.out.println();
h.inOrder1(h.createTree());
}
}
class Tree {
Tree lchild;// 声明数据成员
Tree rchild;
char data;
Tree(Tree lchild, Tree rchild, char data) {
this.lchild = lchild;
this.rchild = rchild;
this.data = data;
}
}
public class Tree {
private int treeId;
private String treeType;// 树种类型
private int count; //种植数量
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public int getTreeId() {
return treeId;
}
public void setTreeId(int treeId) {
this.treeId = treeId;
}
public String getTreeType() {
return treeType;
}
public void setTreeType(String treeType) {
this.treeType = treeType;
}
}
public class Address {
private int addCode;//地区编码
private String area;//地名
public int getAddCode() {
return addCode;
}
public void setAddCode(int addCode) {
this.addCode = addCode;
}
public String getArea() {
return area;
}
public void setArea(String area) {
this.area = area;
}
}
import java.util.HashMap;
import java.util.Map;
public class People {
private int userId;
private String username;
private MapString,MapString,Integer map;
/**
* 传入地区和树种，种树成功。保存到map中。
* @param address
* @param tree
*/
public void plantingTrees(String address,Tree tree){
Map map = new HashMap();
map.put(tree.getTreeType(),tree.getCount());
this.map.put(address,map);
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public MapString, MapString, Integer getMap() {
return map;
}
public void setMap(MapString, MapString, Integer map) {
this.map = map;
}
}