import java.awt.Dimension
import java.awt.event.ActionEvent
import java.awt.event.ActionListener
import java.util.Random
import javax.swing.JButton
import javax.swing.JFrame
import javax.swing.JPanel
import javax.swing.JScrollPane
import javax.swing.JTree
import javax.swing.tree.DefaultMutableTreeNode
public class Randomtree extends JFrame {
private JTree tree
public static String[] school = { "初中课程", "高中课程", "大学课程" }
public static String[] color = { "颜色", "运动", "食物" }
public static String[] plant = { "植物", "动物", "人" }
public static String[][] school2= {
{ "初中一年级", "初中二年级", "初中三年级"}, {"高中一年级", "高中二年级",
"高中三年级"}, {"大学一年级", "大学二年级", "大学三年级", "大学四年级"} }
public static String[][] color2 = {
{ "绿色", "白色", "红色"}, {"足球", "篮球",
"羽毛球"}, {"面包", "牛奶", "披萨", "热狗"} }
public static String[][] plant2 = {
{ "玫瑰花", "月季花", "海棠花"}, {"猪", "狗",
"猫"}, {"黄种人", "黑种人", "白种人", } }
public static void main(String[] args) {
// TODO 自动生成方法存根
new Randomtree()
}
public Randomtree() {
super()
final Random random=new Random()
setVisible(true)
setSize(300,400)
tree = new JTree()
final JPanel panel = new JPanel()
panel.setPreferredSize(new Dimension(0, 40))
getContentPane().add(panel, BorderLayout.NORTH)
final JScrollPane scrollPane = new JScrollPane()
scrollPane.setPreferredSize(new Dimension(300, 350))
getContentPane().add(scrollPane, BorderLayout.CENTER)
final JButton button = new JButton()
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
int k=random.nextInt(3)
tree=getTree(k)
scrollPane.setViewportView(tree)
}
})
scrollPane.setViewportView(null)
button.setText("随机生成树")
panel.add(button)
pack()
}
protected JTree getTree(int n) {
String[] second=null
String[][] three=null
if(n==0){second=schoolthree=school2}
if(n==1){second=colorthree=color2}
if(n==2){second=plantthree=plant2}
DefaultMutableTreeNode root=new DefaultMutableTreeNode("root")
for(int i=0i<second.lengthi++){
DefaultMutableTreeNode secondNode=new DefaultMutableTreeNode(second[i])
for (int j=0j<three[i].lengthj++){
DefaultMutableTreeNode threetNode=new DefaultMutableTreeNode(three[i][j])
secondNode.add(threetNode)
}
root.add(secondNode)
}
JTree tree=new JTree(root)
tree.expandRow(1)
tree.expandRow(5)
tree.expandRow(9)
return tree
}
}
简单的 例子你可以模仿一下
每一个节点有一个成员变量引用下一个节点就行了。
大致实现了一下单向链表 没有加入异常也没有仔细考虑实现的代码的效率，可以参考下。
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public class LinkListTest {
public static void main(String[] args) {
LinkList<String> ll=new LinkList<String>()
ll.add("a")
ll.add("b")
ll.add("c")
ll.add("d")
ll.remove(1)
System.out.println(ll.get(0))
System.out.println(ll.get(1))
System.out.println(ll.get(2))
System.out.println(ll.get(3))
System.out.println(ll.size())
}
}
class LinkList<T>{
private Node<T> frist=null
private Node<T> last=null
private int size=0
public void add(T t){
if(frist==null){
Node<T> node=new Node<T>()
node.setT(t)
size++
frist=node
last=node
}else{
Node<T> node=new Node<T>()
node.setT(t)
last.setNextNode(node)
size++
last=node
}
}
public T get(int i){
if(i>=0&&i<size){
Node<T> nod=null
for(int n=0n<=in++){
if(n==0)
nod=frist
else
nod=nod.getNextNode()
if(i==n){
return nod.getT()
}
}
}
return null
}
public void remove(int i){
if(i>=0&&i<size){
if(size<2){
frist=null
last=null
size=0
}else{
size--
if(i==0){
frist=frist.getNextNode()
}else{
Node<T> nod1=null
Node<T> nod2=null
for(int n=0n<=in++){
if(n==0){
nod1=frist
nod2=frist
}else{
nod2=nod1
nod1=nod1.getNextNode()
}
if(i==n){
if(nod1!=null)
nod2.setNextNode(nod1.getNextNode())
else{
nod2.setNextNode(null)
last=nod2
}
}
}
}
}
}
}
public int size(){
return size
}
}
class Node <T>{
public T getT() {
return t
}
public void setT(T t) {
this.t = t
}
public Node<T> getNextNode() {
return nextNode
}
public void setNextNode(Node<T> nextNode) {
this.nextNode = nextNode
}
private T t
private Node<T> nextNode=null
}
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