给year和month添加一个ItemListener来实时计算指定年和月中有多少天就可以了.
代码是用Swing写的,不过看你的图,不像是Swing界面.
/**
* Create the frame.
*/
public DateDropFrame() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
setBounds(100, 100, 450, 300)
contentPane = new JPanel()
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5))
contentPane.setLayout(new FlowLayout(FlowLayout.LEFT))
final JComboBox year = new JComboBox()
year.setModel(new DefaultComboBoxModel(getModel(start, end)))
contentPane.add(year)
final JComboBox month = new JComboBox()
month.setModel(new DefaultComboBoxModel(getModel(1, 12)))
contentPane.add(month)
final JComboBox day = new JComboBox()
contentPane.add(day)
year.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
setDay(year, month, day)
}
})
month.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
setDay(year, month, day)
}
})
setDay(year, month, day)
setContentPane(contentPane)
}
/**
* calculate days in select month &year
*/
private void setDay(JComboBox year, JComboBox month, JComboBox day) {
int y = Integer.parseInt((String) year.getSelectedItem())
int m = Integer.parseInt((String) month.getSelectedItem())
Calendar c = Calendar.getInstance()
c.set(Calendar.YEAR, y)
c.set(Calendar.MONTH, m - 1)
int days = c.getActualMaximum(Calendar.DAY_OF_MONTH)
day.setModel(new DefaultComboBoxModel(getModel(1, days)))
}
/**
* get String array [start, end]
*/
private String[] getModel(int start, int end) {
String[] m = new String[end - start + 1]
for (int i = 0i <m.lengthi++) {
m[i] = String.valueOf(i + start)
}
return m
}
public class RandomUtils {public static String randomId(){
Random random = new Random()
StringBuilder sb = new StringBuilder()
for (int i = 0 i < 6 i++) {
sb.append(random.nextInt(10))
}
return sb.toString()
}
public static int randomIntId(){
Random random = new Random()
StringBuilder sb = new StringBuilder()
for (int i = 0 i < 6 i++) {
sb.append(random.nextInt(10))
}
return Integer.parseInt(sb.toString())
}
public static String randomName(){
String[] name1 = {"赵","钱","孙","李","周","吴","郑","王","张","刘"}
String[] name2 = {"一","二","三","四","五","六","七","八","九","十"}
Random random = new Random()
StringBuilder sb = new StringBuilder()
sb.append(name1[random.nextInt(10)])
sb.append(name2[random.nextInt(10)])
sb.append(name2[random.nextInt(10)])
return sb.toString()
}
public static String randomSex(){
Random random = new Random()
return random.nextInt(4)/2==0?"男":"女"
}
public static int randomAge(int min, int max){
Random random = new Random()
return random.nextInt(min) + max-min
}
public static int randomScore(){
Random random = new Random()
return (int)(random.nextDouble()*100%100)
}
public static String randomAddress(){
String[] address1 = {"商业","红叶","安康","河南","长海","黄河","桐柏","科学","瑞达","花园"}
String[] address2 = {"东","南","西","北","中"}
String[] address3 = {"街","路","大道","巷"}
Random random = new Random()
StringBuilder sb = new StringBuilder()
sb.append(address1[random.nextInt(10)])
sb.append(address2[random.nextInt(5)])
sb.append(address3[random.nextInt(4)])
sb.append(random.nextInt(1000)+1)
sb.append("号")
return sb.toString()
}
} import javax.swing.*
import javax.swing.event.TreeSelectionEvent
import javax.swing.event.TreeSelectionListener
import javax.swing.table.DefaultTableModel
import javax.swing.tree.DefaultMutableTreeNode
import java.awt.*
import java.util.*
import java.util.List
public class StudentManage extends JFrame{
public final static String[] CH_NUM = {"一","二","三","四","五","六","七","八","九","十"}
public final static String ROOT = "班级管理"
public final static int GRADE_NUM = 3
public final static int CLASS_NUM = 3
private Map<String, List<Student>> classes
public StudentManage() {
setTitle("学生管理系统")
setSize(300, 300)
setLayout(new BorderLayout())
if(classes == null) classes = new HashMap<>()
DefaultMutableTreeNode top = new DefaultMutableTreeNode(ROOT)
DefaultMutableTreeNode[] gradeNodes = new DefaultMutableTreeNode[GRADE_NUM]
for (int i = 0 i < GRADE_NUM i++) {
gradeNodes[i] = new DefaultMutableTreeNode(CH_NUM[i] + "年级")
for (int j = 0 j < CLASS_NUM j++) {
gradeNodes[i].add(new DefaultMutableTreeNode(CH_NUM[j] + "班"))
}
top.add(gradeNodes[i])
}
final JTree tree = new JTree(top)
String title[] = {"ID","姓名","性别","年龄","地址"}
final DefaultTableModel model = new DefaultTableModel(title, 0)
JTable table=new JTable(model)
tree.addTreeSelectionListener(new TreeSelectionListener() {
@Override
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree .getLastSelectedPathComponent()
if (node == null) return
Object object = node.getUserObject()
if (node.isLeaf()) {
List<Student> stdList = classes.get(getFullPath(node))
Object[][] data = new Object[stdList.size()][5]
for (int i = 0 i < stdList.size() i++) {
data[i][0] = stdList.get(i).getId()
data[i][1] = stdList.get(i).getName()
data[i][2] = stdList.get(i).getSex()
data[i][3] = stdList.get(i).getAge()
data[i][4] = stdList.get(i).getAddress()
}
while(model.getRowCount()>0){
model.removeRow(model.getRowCount()-1)
}
for (int i = 0 i < stdList.size() i++) {
model.addRow(data[i])
}
model.fireTableDataChanged()
}
}
})
add(tree, BorderLayout.WEST)
add(new JScrollPane(table), BorderLayout.CENTER)
setVisible(true)
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
}
private String getFullPath(DefaultMutableTreeNode defaultMutableTreeNode){
StringBuilder sb = new StringBuilder()
Object[] objs = defaultMutableTreeNode.getUserObjectPath()
for (int i = 0 i < objs.length i++) {
sb.append(objs[i])
}
return sb.toString().replace(ROOT,"")
}
public void init(){
for (int i = 0 i < GRADE_NUM i++) {
for (int j = 0 j < CLASS_NUM j++) {
int n = new Random().nextInt(30)+1
List<Student> stdList = new ArrayList<>(n)
for (int k = 0 k < n k++) {
stdList.add(new Student(RandomUtils.randomIntId(),RandomUtils.randomName(),RandomUtils.randomSex(),
RandomUtils.randomAge(6,12),RandomUtils.randomAddress()))
}
classes.put(CH_NUM[i] + "年级"+ CH_NUM[j] +"班", stdList)
}
}
}
public static void main(String[] args) {
StudentManage studentManage = new StudentManage()
studentManage.init()
}
}
class Student {
private int id
private String name
private String sex
private int age
private String address
public Student(int id, String name, String sex, int age, String address) {
this.id = id
this.name = name
this.sex = sex
this.age = age
this.address = address
}
public Student() {
}
public int getId() {
return id
}
public String getName() {
return name
}
public String getSex() {
return sex
}
public int getAge() {
return age
}
public String getAddress() {
return address
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", sex='" + sex + '\'' +
", age=" + age +
", address='" + address + '\'' +
'}'
}
}
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