GUI编程 --2
GUI编程 --2
2.4 事件监听
按钮的使用。
package com.ssl.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestActionEvent {
public static void main(String[] args) {
//按下按钮，触发一些事件
Frame frame =new Frame();
Button button = new Button();
//因为addActionListener需要一个实现类
MyActionListener myActionListener = new MyActionListener();
button.addActionListener(myActionListener);
frame.add(button);
frame.setVisible(true);
frame.setSize(400,400);
windowsClose(frame); //关闭窗口
}
//关闭窗体的事件
private static void windowsClose(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class MyActionListener implements ActionListener{
private static int a = 0 ;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(++a);
}
}
两个按钮绑定一个监听
package com.ssl.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestActionTwo {
public static void main(String[] args) {
//两个按钮，实现同一个监听
//开始 停止
Frame frame = new Frame("开始-停止");
Button button1 =new Button("start");
Button button2 =new Button("stop");
frame.add(button1,BorderLayout.NORTH);
frame.add(button2,BorderLayout.SOUTH);
//设置了SetActioncommand的按钮，事件监听会读取到相应的内容。否则，会读取按钮的标签。
button2.setActionCommand("Button2-stop");
button1.addActionListener(new MyMonitor());
button2.addActionListener(new MyMonitor());
frame.setSize(500,500);
frame.setVisible(true);
windowsClose(frame);
}
//关闭窗体的事件
private static void windowsClose(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class MyMonitor implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("按钮被点击了！"+e.getActionCommand());
}
}
2.5输入框TextField 监听
package com.ssl.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TextText01 {
public static void main(String[] args) {
//启动
MyFrame frame = new MyFrame();
frame.setSize(400,400);
WindowsCloser(frame);
}
public static void WindowsCloser(MyFrame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class MyFrame extends Frame{
public MyFrame(){
TextField textField = new TextField();
add(textField);
//setSize(400,400);
//监听这个文本框输入的文件,按下回车就会触发这个输入框的事件。
textField.addActionListener(new MyActionListener2());
//设置替换编码
textField.setEchoChar('*');
setVisible(true);
pack(); //自适应调整窗口大小
}
}
class MyActionListener2 implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField field = (TextField) e.getSource(); //获得一些资源
System.out.println(field.getText());
}
}
2.6简易计算器，组合+内部类
OOP原则中，组合大于继承。
//继承
class A extend B{
}
//组合
class A{
public B b;
}
计算器
//第一版代码
package com.ssl.lesson02;
import javax.crypto.interfaces.PBEKey;
import javax.swing.*;
import javax.xml.soap.Text;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
//简易计算器
public class TestCalc {
public static void main(String[] args) {
new Calculator();
}
}
//计算器类
class Calculator extends Frame{
public Calculator(){
setTitle("Calculator");
//3个文本框
TextField textField1 = new TextField(10);
TextField textField2 = new TextField(10);
TextField textField3 = new TextField(20);
//一个按钮
Button button = new Button("=");
button.addActionListener(new MyCalculatorListener(textField1,textField2,textField3));
//一个标签
Label label = new Label("+");
//设置布局
setLayout(new FlowLayout());
//加元素
add(textField1);
add(label);
add(textField2);
add(button);
add(textField3);
setVisible(true);
setBounds(400,400,600,400);
setSize(600,100);
widowsCloser(this);
}
public static void widowsCloser(Calculator calculator){
calculator.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
//监听器类 监听输入框
class MyCalculatorListener implements ActionListener{
//获取三个变量
private TextField num1,num2,num3;
public MyCalculatorListener(TextField num1,TextField num2,TextField num3){
this.num1=num1;
this.num2=num2;
this.num3=num3;
}
@Override
public void actionPerformed(ActionEvent e) {
/**
* 1.获得加数和被加数
* 2.将这个值+法运算后，放到第三个框
* 3.清除前两个框
*/
//获取前第一个框和第二框，并转为int
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
num3.setText(" "+(n1+n2));
num1.setText("");
num2.setText("");
}
}
完全改造为面向对象
package com.ssl.lesson02;
import javax.crypto.interfaces.PBEKey;
import javax.swing.*;
import javax.xml.soap.Text;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
//简易计算器
public class TestCalc {
public static void main(String[] args) {
new Calculator();
}
}
//计算器类
class Calculator extends Frame{
//属性
TextField num1,num2,num3;
public Calculator(){
setTitle("Calculator");
//3个文本框
num1 = new TextField(10);
num2 = new TextField(10);
num3 = new TextField(20);
//一个按钮
Button button = new Button("=");
button.addActionListener(new MyCalculatorListener(this));
//一个标签
Label label = new Label("+");
//设置布局
setLayout(new FlowLayout());
//加元素
add(num1);
add(label);
add(num2);
add(button);
add(num3);
setVisible(true);
setBounds(400,400,600,400);
setSize(600,100);
widowsCloser(this);
}
public static void widowsCloser(Calculator calculator){
calculator.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
//监听器类 监听输入框
class MyCalculatorListener implements ActionListener{
//获取计算器在这个对象,在一个类中组合另外一个类
Calculator calculator = null;
public MyCalculatorListener(Calculator calculator){
this.calculator=calculator;
}
@Override
public void actionPerformed(ActionEvent e) {
/**
* 1.获得加数和被加数
* 2.将这个值+法运算后，放到第三个框
* 3.清除前两个框
*/
//获取前第一个框和第二框，并转为int
int n1 = Integer.parseInt(calculator.num1.getText());
int n2 = Integer.parseInt(calculator.num2.getText());
calculator.num3.setText(" "+(n1+n2));
calculator.num1.setText("");
calculator.num2.setText("");
}
}
内部类：
小tip：null 不等于"";
package com.ssl.lesson02;
import javax.crypto.interfaces.PBEKey;
import javax.swing.*;
import javax.xml.soap.Text;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
//简易计算器
public class TestCalc {
public static void main(String[] args) {
new Calculator();
}
}
//计算器类
class Calculator extends Frame{
//属性
TextField num1,num2,num3;
public Calculator(){
setTitle("Calculator");
//3个文本框
num1 = new TextField(10);
num2 = new TextField(10);
num3 = new TextField(20);
//一个按钮
Button button = new Button("=");
button.addActionListener(new MyCalculatorListener());
//一个标签
Label label = new Label("+");
//设置布局
setLayout(new FlowLayout());
//加元素
add(num1);
add(label);
add(num2);
add(button);
add(num3);
setVisible(true);
setBounds(400,400,600,400);
setSize(600,100);
widowsCloser(this);
}
public static void widowsCloser(Calculator calculator){
calculator.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
//监听器类 监听输入框 内部类
private class MyCalculatorListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
/**
* 1.获得加数和被加数
* 2.将这个值+法运算后，放到第三个框
* 3.清除前两个框
*/
if(((String)num1.getText()).length() == 0 ||"".equals((String)num2.getText()) ){
num1.setText("0");
num2.setText("0");
num3.setText("0");
return ;
}
//获取前第一个框和第二框，并转为int
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
num3.setText(" "+(n1+n2));
num1.setText("");
num2.setText("");
}
}
}
2.7画笔Paint
package com.ssl.lesson03;
import javafx.beans.binding.SetBinding;
import java.awt.*;
public class TestPaint {
public static void main(String[] args) {
new MyPaint().loadFrame();
}
}
class MyPaint extends Frame{
public void loadFrame(){
setBounds(200,200,600,500);
setVisible(true);
}
//画笔
public void paint(Graphics g){
//画笔，需要有颜色，画笔可以画画
//设置颜色
g.setColor(Color.red);
//空心圆
g.drawOval(100,100,100,100);
g.setColor(Color.orange);
//实心圆
g.fillOval(200,200,100,100);
//养成习惯，画笔完，将他还原为最初的颜色
}
}
2.8 鼠标监听
- 画板 与画笔绑定
- 画笔 读x y
- 鼠标：监听事件 x，y 读完然后repaint（）；
- 存点的集合：存x y
package com.ssl.lesson03;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
public class TestMouseListener {
public static void main(String[] args) {
new MyFrame("point");
}
}
//自己的类
class MyFrame extends Frame {
//画画需要画笔，需要监听鼠标当前的位置，需要集合来存储这个点
ArrayList points;
public MyFrame(String title) {
super(title);
setBounds(200, 200, 400, 300);
//鼠标的监听器
this.addMouseListener(new MyMouseListener());
//存鼠标点击的点
points = new ArrayList<>();
setVisible(true);
}
public void paint(Graphics g) {
//画画，监听鼠标的事件
//用迭代器去取
Iterator iterator = points.iterator();
while (iterator.hasNext()) {
Point point = (Point) iterator.next();
g.setColor(Color.BLUE);
g.fillOval(point.x, point.y, 10, 10);
}
}
//添加一个点到界面上
public void addPoint(Point point) {
points.add(point);
}
private class MyMouseListener extends MouseAdapter {
//鼠标按下
@Override
public void mousePressed(MouseEvent e) {
MyFrame frame = (MyFrame) e.getSource();
//这样我们点击的时候就会产生一个点
frame.addPoint(new Point(e.getX(), e.getY()));
//这个点就是我们鼠标的点
//每次点击都要重新画一次
frame.repaint();
}
}
}
2.9窗口监听
推荐使用匿名内部类
package com.ssl.lesson03;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestWindow {
public static void main(String[] args) {
new WindowFrame();
}
}
class WindowFrame extends Frame {
public WindowFrame(){
setBackground(Color.BLUE);
setBounds(100,100,200,200);
setVisible(true);
this.addWindowListener(
//匿名内部类
new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.out.println("你点击了关闭");
}
}
);
}
}
2.10键盘监听
package com.ssl.lesson03;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class TestKeyListener {
public static void main(String[] args) {
new KeyFrame();
}
}
class KeyFrame extends Frame {
public KeyFrame() {
setBounds(100, 100, 200, 200);
setVisible(true);
this.addKeyListener(new KeyAdapter() {
//键盘按下
@Override
public void keyPressed(KeyEvent e) {
//键盘按下的键是哪一个
int keyCode = e.getKeyCode();//获取当前键盘的码
System.out.println(keyCode); //不需要记住，直接使用VK_XXX
if (keyCode == KeyEvent.VK_UP) {
System.out.println("你按下了上键");
}
//根据按下的键，产生不同的结果
}
});
}
}
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