table of Contents
1. The purpose of the experiment
3. Design the chat window as shown in Figure 5-4
1. The purpose of the experiment
1. Grasp the basic concepts of JavaFX stage, scene, node, panel, control, etc.
2. Master the window structure of JavaFX ;
3. Master the layout panel classes commonly used in JavaFX , such as stack panel StackPane class, flow panel FlowPane class, border panel BorderPane class, GridPane grid panel class, Hbox single row panel class, Vbox single column panel class, etc.;
4. Master the commonly used controls, such as Button , TextField , Label , PasswordField, etc.;
5. Master the JavaFx event handling mechanism;
2. Experimental code
1. Write an application program with a window titled "Login", which can realize the input of user name and password.
( 1 ) If the user name and password are entered correctly, click the "Login" button to pop up the "User Login Successful" message box;
( 2 ) If the user name and password are entered incorrectly, click the "Login" button to pop up the "User login failed" message box.
import java.util.ArrayList;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextArea;
import javafx.scene.layout.GridPane;
import javafx.scene.control.ScrollPane;
public class App15_7 extends Application
{
private TextField tf=new TextField();
private PasswordField pf=new PasswordField();
private TextArea ta=new TextArea("未登录");
@Override
public void start(Stage Stage)
{
GridPane rootGP=new GridPane();
final Label lab1=new Label("用户名：");
final Label lab2=new Label("密 码：");
tf.setPromptText("输入用户名");
pf.setPromptText("输入密码");
rootGP.add(lab1,0,0);
rootGP.add(tf,1,0);
rootGP.add(lab2,0,1);
rootGP.add(pf,1,1);
final ScrollPane scro=new ScrollPane(ta);
ta.setPrefColumnCount(15);
ta.setEditable(false);
pf.setOnAction(e->
{
ArrayList databases = new ArrayList();
user user1 = new user("tim","123");
databases.add(user1);
user user2 = new user("mary","121");
databases.add(user2);
user user3 = new user("bill","321");
databases.add(user3);
user user4 = new user("carl","110");
databases.add(user4);
for(int i=0;i<=databases.size()-1;i++) {
if(tf.getText().equals(((user) databases.get(i)).getname()) && pf.getText().equals(((user) databases.get(i)).getpsw()))
{
ta.setEditable(true);
ta.setWrapText(true);
ta.setStyle("-fx-text-fill:red");
ta.setText("恭喜你！！\n登录成功");
}
}
}
);
rootGP.add(scro,0,3,4,3);
Scene scene=new Scene(rootGP,190,120);
Stage.setTitle("登录");
Stage.setScene(scene);
Stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
2. Write an application that has a window titled "Registered Student Information". Please design the layout and components of the window by yourself to realize the registration function of student information.
( 1 ) Student information includes: student ID, name, date of birth, etc.;
( 2 ) Click the registration button, if you have not registered, the "Student Information Registration Successful" dialog box will pop up, and the student will be added to the List collection;
( 3 ) Click the register button, if the student has already registered, the "student information already exists, registration failed" dialog box will pop up;
( 4 ) Click the Cancel button to end this registration and close the window.
( 5 ) Adopting object-oriented programming ideas
package Javatest;
import java.util.ArrayList;
import java.util.Iterator;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
@SuppressWarnings("unused")
public class Lab5 extends Application{
final Label lab1=new Label("姓名：");
final Label lab2=new Label("学号：");
final Label lab3=new Label("出生日期：");
final TextField tf1=new TextField();
final TextField tf2=new TextField();
final TextField tf3=new TextField();
public Button bt1;
public Button bt2;
@Override
public void start(Stage primaryStage ) throws Exception {
GridPane rootGP=new GridPane();
rootGP.setPadding(new Insets(15,15,15,15));
rootGP.setHgap(5);
rootGP.setVgap(5);
tf1.setPromptText("请输入学生姓名");
rootGP.add(lab1, 0, 0);
rootGP.add(tf1, 1, 0);
tf2.setPromptText("请输入学生号");
rootGP.add(lab2, 0, 1);
rootGP.add(tf2, 1, 1);
tf3.setPromptText("请输入出生日期");
rootGP.add(lab3, 0, 2);
rootGP.add(tf3, 1, 2);
Button bt1=new Button("注册");
rootGP.add(bt1, 0, 3);
Button bt2=new Button("取消");
rootGP.add(bt2, 1, 3);
Scene scene=new Scene(rootGP,400,120);
primaryStage.setScene(scene);
primaryStage.setTitle("登录");
primaryStage.show();
bt1.setOnAction(e->{
Stage stage=new Stage();
stage.setTitle("消息框");
final TextArea ta=new TextArea("请输入内容....");
ta.setText("成功界面");
stage.setScene(new Scene (ta,180,180));
stage.show();
if ((tf1.getText().equals("周彦志")) && (tf2.getText().equals("2019443709"))
&& tf3.getText().equals("2001-07-06"))
{
ta.setWrapText(true);
ta.setStyle("-fx-text-fill:blue");
ta.setText("注册成功！");
ArrayList<String> list1=new ArrayList<String>();
list1.add("杨洪 2019443747 2000年12月11日");
/*遍历
数组*/
@SuppressWarnings("rawtypes")
Iterator i =list1.iterator();
while (i.hasNext()) {
String str=(String)i.next();
System.out.println(str);
}
}else {
ta.setWrapText(true);//文本区可换行
ta.setStyle("-fx-text-fill:red");//将文本区中的文字设置为红色
ta.setText("该学生信息已存在，注册失败！");
}});
}
}
3. Design the chat window as shown in Figure 5-4
Figure 5-4 Chat window interface
Click the "Send" button to send the information in the text area to the chat area, and clear the content;
When the window starts, load the historical chat history;
Click the close button to save the chat history to a file and close the window.
package homework5;
import java.awt.Button;
import java.awt.Frame;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class Q4 extends Frame {
TextArea ta;
TextField tf;
public Q4() {//用构造函数初始化
ta = new TextArea("");
ta.setBounds(50, 50, 350, 200);
tf = new TextField("");
tf.setBounds(50, 300, 350, 50);
Button b1 = new Button("发送");
b1.setBounds(400, 300, 50, 50);
Button b2 = new Button("关闭");
b2.setBounds(460, 300, 50, 50);
add(ta);
add(tf);
add(b1);
add(b2);
b1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
ta.append(tf.getText()+"\n");
tf.setText("");
}
});
jie er = new jie();
b2.addActionListener(er);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent ee) {
System.exit(0);
}
});
}
public static void main(String[] args) {
Q4 f = new Q4();
f.setLayout(null);
f.setTitle("消息窗口");
f.setSize(600, 600);
f.setVisible(true);
}
class jie implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);//不是1
}
}
}
}
4. (Optional) Write a simple calculator program, the interface is shown in Figure 5-5, to realize simple addition, subtraction, multiplication, division and other functions. Up to 12 numbers are displayed.
Figure 5-5 Simple calculator
package demo05;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Calculator implements ActionListener{
GridLayout layout;
JButton button1,button2,button3,button4,button5,button6,button7,button8,button9,button10,button11,button12,button13,button14,button15,button16;
JSplitPane jsp;
JFrame frame;
// JTextArea area;
JPanel pane1,pane2;
JTextField jtf;
public Calculator(){
frame=new JFrame("计算器");
frame.setSize(new Dimension(400,600));
layout=new GridLayout(4,4);
pane1=new JPanel(layout);
jtf=new JTextField();
jtf.setBounds(0, 0, 400, 200);
button1=new JButton("7");
button2=new JButton("8");
button3=new JButton("9");
button4=new JButton("/");
button5=new JButton("4");
button6=new JButton("5");
button7=new JButton("6");
button8=new JButton("*");
button9=new JButton("1");
button10=new JButton("2");
button11=new JButton("3");
button12=new JButton("+");
button13=new JButton(".");
button14=new JButton("0");
button15=new JButton("=");
button16=new JButton("-");
pane1.add(button1);
pane1.add(button2);
pane1.add(button3);
pane1.add(button4);
pane1.add(button5);
pane1.add(button6);
pane1.add(button7);
pane1.add(button8);
pane1.add(button9);
pane1.add(button10);
pane1.add(button11);
pane1.add(button12);
pane1.add(button13);
pane1.add(button14);
pane1.add(button15);
pane1.add(button16);
jsp=new JSplitPane(JSplitPane.VERTICAL_SPLIT,jtf,pane1);
frame.add(jsp);
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
button5.addActionListener(this);
button6.addActionListener(this);
button7.addActionListener(this);
button8.addActionListener(this);
button9.addActionListener(this);
button10.addActionListener(this);
button11.addActionListener(this);
button12.addActionListener(this);
button13.addActionListener(this);
button14.addActionListener(this);
button15.addActionListener(this);
button16.addActionListener(this);
jtf.addActionListener(this);
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent event) {
Object obj=event.getSource();
if(obj instanceof JButton){
JButton button=(JButton)obj;
if(button14==button){
if(jtf.getText().equals("0")){
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"0");
}
}
if(button9==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("1");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"1");
}
}
if(button10==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("2");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"2");
}
}
if(button11==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("3");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"3");
}
}
if(button5==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("4");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"4");
}
}
if(button6==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("5");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"5");
}
}
if(button7==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("6");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"6");
}
}
if(button1==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("7");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"7");
}
}
if(button2==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("8");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"8");
}
}
if(button3==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("9");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"9");
}
}
if(button13==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"");
}
}
if(button12==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("+");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"+");
}
}
if(button16==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("-");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"-");
}
}
if(button8==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("*");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"*");
}
}
if(button4==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText("/");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+"/");
}
}
if(button13==button){
if(jtf.getText().equals("0")){
jtf.setText("");
jtf.setText(".");
jtf.requestFocus();
}
else{
String str=jtf.getText();
jtf.setText(str+".");
}
}
//等号实现加减乘除功能
if(button15==button){
if(jtf.getText().indexOf("+")!=-1){
String str=jtf.getText();
int i=str.indexOf("+");
String s=str.substring(0, i);
String s1=str.substring(i+1,str.length());
Double d1=Double.parseDouble(s);
Double d2=Double.parseDouble(s1);
double result=d1+d2;
String str1=String.valueOf(result);
jtf.setText(str1);
｝
//减法运算
else
if(jtf.getText().indexOf("-")!=-1){
String str=jtf.getText();
int i=str.indexOf("-");
String s=str.substring(0, i);
String s1=str.substring(i+1,str.length());
Double d1=Double.parseDouble(s.trim());
Double d2=Double.parseDouble(s1);
double result=d1-d2;
String str1=String.valueOf(result);
jtf.setText(str1);
}
//乘法运算
else if(jtf.getText().indexOf("*")!=-1){
String str=jtf.getText();
int i=str.indexOf("*");
String s=str.substring(0, i);
String s1=str.substring(i+1,str.length());
Double d1=Double.parseDouble(s.trim());
Double d2=Double.parseDouble(s1);
double result=d1*d2;
String str1=String.valueOf(result);
jtf.setText(str1);
}
else if(jtf.getText().indexOf("/")!=-1){
String str=jtf.getText();
int i=str.indexOf("/");
String s=str.substring(0, i);
String s1=str.substring(i+1,str.length());
Double d1=Double.parseDouble(s.trim());
Double d2=Double.parseDouble(s1);
double result=d1/d2;
String str1=String.valueOf(result);
jtf.setText(str1);
}
else{
jtf.setText("请选择要输入的运算符");
}
}
}
}
public static void main(String[] args){
new Calculator();
}
}
One word per text
Happiness is always given to yourself, so what is the so-called sense of security?
The lucky color in this article is orange! Hope you are happy every day!