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java班级浏览代码 java打开浏览文件目录

IT技术public

运行时可调用浏览器打开一个网页，网页地址在代码中的java代码怎么写？网页地址在代码中的java代码写法如下：
packagecom.test;
importjava.lang.reflect.Method;
//实现打开浏览器并跳到指定网址的类
publicclassBareBonesBrowserLaunch{
publicstaticvoidopenURL(Stringurl){
try{
browse(url);
}catch(Exceptione){
}
}
privatestaticvoidbrowse(Stringurl)throwsException{
//获取操作系统的名字
StringosName=System.getProperty("os.name","");
if(osName.startsWith("MacOS")){
//苹果的打开方式
ClassfileMgr=Class.forName("com.apple.eio.FileManager");
MethodopenURL=fileMgr.getDeclaredMethod("openURL",newClass[]{String.class});
openURL.invoke(null,newObject[]{url});
}elseif(osName.startsWith("Windows")){
//windows的打开方式 。
Runtime.getRuntime().exec("rundll32url.dll,FileProtocolHandler" url);
}else{
//UnixorLinux的打开方式
String[]browsers={"firefox","opera","konqueror","epiphany","mozilla","netscape"};
Stringbrowser=null;
for(intcount=0;countbrowsers.lengthbrowser==null;count)
//执行代码，在brower有值后跳出，
//这里是如果进程创建成功了，==0是表示正常结束 。
if(Runtime.getRuntime().exec(newString[]{"which",browsers[count]}).waitFor()==0)
browser=browsers[count];
if(browser==null)
thrownewException("Couldnotfindwebbrowser");
else
//这个值在上面已经成功的得到了一个进程 。
Runtime.getRuntime().exec(newString[]{browser,url});
}
}
}
//主方法测试类
publicstaticvoidmain(String[]args){
Stringurl="";
BareBonesBrowserLaunch.openURL(url);
}
.给出存储班级三十名学生基本信息的Java代码 ， 基本信息的具体赋值由考生自拟？下面是一个存储班级三十名学生基本信息的 Java 代码示例：
import java.util.ArrayList;
public class Student {
private String name;
private int age;
private String gender;
public Student(String name, int age, String gender) {
this.name = name;
this.age = age;
this.gender = gender;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getGender() {
return gender;
}
}
public class Classroom {
private ArrayListStudent students;
public Classroom() {
this.students = new ArrayListStudent();
}
public void addStudent(Student student) {
students.add(student);
}
public ArrayListStudent getStudents() {
return students;
}
}
public class Main {
public static void main(String[] args) {
Classroom classroom = new Classroom();
// 添加 30 名学生的基本信息
classroom.addStudent(new Student("Tom", 18, "Male"));
classroom.addStudent(new Student("Alice", 19, "Female"));
// ...
// 此处省略 28 名学生的信息
// 获取所有学生的信息
ArrayListStudent students = classroom.getStudents();
for (Student student : students) {
System.out.println("Name: "student.getName());
System.out.println("Age: "student.getAge());
System.out.println("Gender: "student.getGender());
}
}
}
该代码定义了两个类：Student 类表示一个学生，包含了学生的姓名、年龄和性别等信息；Classroom 类表示一个班级 ， 包含了一个学生的列表 ， 并提供了添加学生和获取学生列表的方法 。
在 Main 类的 main 方法中，我们首先实例化一个 Classroom 对象，然后依次添加 30 名学生的信息 。最后，我们调用 getStudents 方法获取所
利用swing设计一个班级学生信息管理系统 ， 一道JAVA题 求代码，不要废话public class RandomUtils {
public static String randomId(){
Random random = new Random();
StringBuilder sb = new StringBuilder();
for (int i = 0; i6; 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; i6; 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()*1000);
}
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 MapString, ListStudent 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; iGRADE_NUM; i) {
gradeNodes[i] = new DefaultMutableTreeNode(CH_NUM[i]"年级");
for (int j = 0; jCLASS_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()) {
ListStudent stdList = classes.get(getFullPath(node));
Object[][] data = https://www.04ip.com/post/new Object[stdList.size()][5];
for (int i = 0; istdList.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; istdList.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; iobjs.length; i) {
sb.append(objs[i]);
}
return sb.toString().replace(ROOT,"");
}
public void init(){
for (int i = 0; iGRADE_NUM; i) {
for (int j = 0; jCLASS_NUM; j) {
int n = new Random().nextInt(30) 1;
ListStudent stdList = new ArrayList(n);
for (int k = 0; kn; 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'\''
'}';
}
}
java编程求救，编写班级类Grade.java
package com.example.gradedemo;
import java.util.HashMap;
import java.util.Map;
// 班级类
public class Grade {
private MapString, Integer students;
public Grade() {
this.students = new HashMapString, Integer();
}
// 添加学生
public void addStudent(String studentNo, int score) {
this.students.put(studentNo, score);
}
// 获取学生分数
public int getScore(String studentNo) {
return this.students.get(studentNo);
}
// 获取平均分数
public int getAverageScore() {
int sum = 0;
for(Map.EntryString, Integer entry : this.students.entrySet()) {
sum= entry.getValue();
}
return sum / this.students.size();
}
// 获取最高分数
public int getMaxScore() {
int score = Integer.MIN_VALUE;
for(Map.EntryString, Integer entry : this.students.entrySet()) {
if(entry.getValue()score) {
score = entry.getValue();
}
}
return score;
}
// 获取最低分数
public int getMinScore() {
int score = Integer.MAX_VALUE;
for(Map.EntryString, Integer entry : this.students.entrySet()) {
if(entry.getValue()score) {
score = entry.getValue();
}
}
return score;
}
}
App.java
package com.example.gradedemo;
public class App {
public static void main(String[] args) {
Grade grade = new Grade();
grade.addStudent("1001", 200);
grade.addStudent("1002", 300);
grade.addStudent("1003", 350);
System.out.println("学生1001的分数："grade.getScore("1001"));
System.out.println("平均分数："grade.getAverageScore());
System.out.println("最高分数："grade.getMaxScore());
System.out.println("最低分数："grade.getMinScore());
}
}
用JAVA语言定义一个类，输出学生班级，姓名信息import java.util.ArrayList;
import java.util.List;
public class Student {
public static void main(String[] args) {
ListStudents studentCount = new ArrayListStudents();//定义一个对象数组存放所有学生的信息
Students firstStudent = new Students();
firstStudent.setGrand("一班");//因为对象里的成员变量是私有的 ， 只能通过SET方法来复制
firstStudent.setName("张三");
studentCount.add(firstStudent);
Students secondStudent = new Students();
secondStudent.setGrand("三班");
secondStudent.setName("王五");
studentCount.add(secondStudent);
for (int index = 0; indexstudentCount.size(); index) {//遍历并通过GET方法取值并输出
System.out.println(studentCount.get(index).getGrand()""
studentCount.get(index).getName());
}
}
}
/**
* 定义这样的一个Students类存放学生的相关信息
* @author Administrator
*
*/
class Students {
private String name;
private String grand;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGrand() {
return grand;
}
public void setGrand(String grand) {
this.grand = grand;
}
}
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