jb_reset.setText("\u91cd\u7f6e"); jb_reset.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jb_resetActionPerformed(evt); } })
时间: 2024-04-27 13:19:34 浏览: 151
这段代码是Java Swing中的一个按钮组件的定义和事件处理。其中`\u91cd\u7f6e`表示“重置”两个汉字的Unicode编码,用于设置按钮上的文本。`jb_reset`是该按钮的名称。`addActionListener()`方法用于为按钮添加一个监听器,即当用户点击该按钮时,会调用`jb_resetActionPerformed()`方法进行响应处理。
需要注意的是,该代码片段只是一个按钮的定义和事件处理,不能独立运行。在使用该代码时,需要将按钮添加到一个容器中才能够正常显示。此外,在实际使用中,需要根据具体需求来实现`jb_resetActionPerformed()`方法的具体逻辑。
相关问题
import java.awt.*; import javax.swing.*; public class sdsds { public static void main(String[] args){ JFrame f=new JFrame("color"); f.setSize(600,500); f.setLocation(300, 200); f.setLayout(new GridLayout(2,1,10,20)); Panel p1=new Panel(); Panel p2=new Panel(); p1.setLayout(new GridLayout(3,4,20,20)); Label red=new Label("红色",Label.CENTER); red.setFont(new Font(Font.DIALOG,Font.BOLD,20)); red.setBackground(Color.red); Button bt1=new Button("+"); bt1.setFont(new Font(Font.DIALOG,Font.BOLD,20)); TextField t1=new TextField("220"); t1.setFont(new Font(Font.DIALOG,Font.BOLD,50)); Button bt5=new Button("-"); bt5.setFont(new Font(Font.DIALOG,Font.BOLD,20)); p1.add(red); p1.add(bt1); p1.add(t1); p1.add(bt5); Label green=new Label("绿色",Label.CENTER); green.setFont(new Font(Font.DIALOG,Font.BOLD,20)); green.setBackground(Color.green); Button bt2=new Button("+"); bt2.setFont(new Font(Font.DIALOG,Font.BOLD,20)); TextField t2=new TextField("220"); t2.setFont(new Font(Font.DIALOG,Font.BOLD,50)); Button bt6=new Button("-"); bt6.setFont(new Font(Font.DIALOG,Font.BOLD,20)); p1.add(green); p1.add(bt2); p1.add(t2); p1.add(bt6); Label blue=new Label("蓝色",Label.CENTER); blue.setFont(new Font(Font.DIALOG,Font.BOLD,20)); blue.setBackground(Color.blue); Button bt3=new Button("+"); bt3.setFont(new Font(Font.DIALOG,Font.BOLD,20)); TextField t3=new TextField("220"); t3.setFont(new Font(Font.DIALOG,Font.BOLD,50)); Button bt7=new Button("-"); bt7.setFont(new Font(Font.DIALOG,Font.BOLD,20)); p1.add(blue); p1.add(bt3); p1.add(t3); p1.add(bt7); p2.setBackground(new Color(255, 255, 0)); f.add(p1); f.add(p2); f.setVisible(true); } } 帮我在上面代码的基础上,实现点击加减按钮能改变颜色值中各色值的分量,下面面板的颜色同步改变
好的,你需要对代码进行一些修改。首先,你需要在每个加减按钮的监听器中获取当前颜色值的分量,然后根据加减操作改变分量值,并重新设置颜色。
下面是修改后的代码:
```java
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class sdsds {
public static void main(String[] args) {
JFrame f = new JFrame("color");
f.setSize(600, 500);
f.setLocation(300, 200);
f.setLayout(new GridLayout(2, 1, 10, 20));
Panel p1 = new Panel();
Panel p2 = new Panel();
p1.setLayout(new GridLayout(3, 4, 20, 20));
Label red = new Label("红色", Label.CENTER);
red.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
red.setBackground(Color.red);
Button bt1 = new Button("+");
bt1.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
TextField t1 = new TextField("220");
t1.setFont(new Font(Font.DIALOG, Font.BOLD, 50));
Button bt5 = new Button("-");
bt5.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
// 添加加减按钮的监听器
bt1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int value = Integer.parseInt(t1.getText());
if (value < 255) {
value++;
t1.setText(String.valueOf(value));
red.setBackground(new Color(value, Integer.parseInt(t2.getText()), Integer.parseInt(t3.getText())));
p2.setBackground(new Color(value, Integer.parseInt(t2.getText()), Integer.parseInt(t3.getText())));
}
}
});
bt5.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int value = Integer.parseInt(t1.getText());
if (value > 0) {
value--;
t1.setText(String.valueOf(value));
red.setBackground(new Color(value, Integer.parseInt(t2.getText()), Integer.parseInt(t3.getText())));
p2.setBackground(new Color(value, Integer.parseInt(t2.getText()), Integer.parseInt(t3.getText())));
}
}
});
p1.add(red);
p1.add(bt1);
p1.add(t1);
p1.add(bt5);
Label green = new Label("绿色", Label.CENTER);
green.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
green.setBackground(Color.green);
Button bt2 = new Button("+");
bt2.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
TextField t2 = new TextField("220");
t2.setFont(new Font(Font.DIALOG, Font.BOLD, 50));
Button bt6 = new Button("-");
bt6.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
bt2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int value = Integer.parseInt(t2.getText());
if (value < 255) {
value++;
t2.setText(String.valueOf(value));
green.setBackground(new Color(Integer.parseInt(t1.getText()), value, Integer.parseInt(t3.getText())));
p2.setBackground(new Color(Integer.parseInt(t1.getText()), value, Integer.parseInt(t3.getText())));
}
}
});
bt6.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int value = Integer.parseInt(t2.getText());
if (value > 0) {
value--;
t2.setText(String.valueOf(value));
green.setBackground(new Color(Integer.parseInt(t1.getText()), value, Integer.parseInt(t3.getText())));
p2.setBackground(new Color(Integer.parseInt(t1.getText()), value, Integer.parseInt(t3.getText())));
}
}
});
p1.add(green);
p1.add(bt2);
p1.add(t2);
p1.add(bt6);
Label blue = new Label("蓝色", Label.CENTER);
blue.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
blue.setBackground(Color.blue);
Button bt3 = new Button("+");
bt3.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
TextField t3 = new TextField("220");
t3.setFont(new Font(Font.DIALOG, Font.BOLD, 50));
Button bt7 = new Button("-");
bt7.setFont(new Font(Font.DIALOG, Font.BOLD, 20));
bt3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int value = Integer.parseInt(t3.getText());
if (value < 255) {
value++;
t3.setText(String.valueOf(value));
blue.setBackground(new Color(Integer.parseInt(t1.getText()), Integer.parseInt(t2.getText()), value));
p2.setBackground(new Color(Integer.parseInt(t1.getText()), Integer.parseInt(t2.getText()), value));
}
}
});
bt7.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int value = Integer.parseInt(t3.getText());
if (value > 0) {
value--;
t3.setText(String.valueOf(value));
blue.setBackground(new Color(Integer.parseInt(t1.getText()), Integer.parseInt(t2.getText()), value));
p2.setBackground(new Color(Integer.parseInt(t1.getText()), Integer.parseInt(t2.getText()), value));
}
}
});
p1.add(blue);
p1.add(bt3);
p1.add(t3);
p1.add(bt7);
p2.setBackground(new Color(255, 255, 0));
f.add(p1);
f.add(p2);
f.setVisible(true);
}
}
```
现在你可以运行代码并测试它。当你单击加减按钮时,颜色值的分量将随之改变,并且下面的面板颜色也会同步改变。
1、 设计一个登录窗口,窗口的组件及布局如下图所示,要求: (1) 验证码(如下图中的“AF3N”)随机生成。 (2) 点击登录按钮,判断用户名是否为“dgutlisi”,密码是否为“123456”,输入的验证码是否与随机生成的验证码一致。如果以上三项的输入都正确,弹出“输入正确,登录成功”的提示对话框;否则,弹出“输入错误,请重新输入”的提示对话框,并清除不正确的输入框内的内容。 (3) 按下“取消”按钮,关闭窗口,结束程序运行。(Exp6_01.java) 程序代码:(注:代码必须有注解,说明该代码段是什么功能) 运行效果图:(注:运行图必须有图号,如“图6-1 登录窗口”)
由于无法插入图片,以下为代码和运行效果的文字描述:
代码:
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
public class Exp6_01 extends JFrame implements ActionListener {
private JLabel labelUser, labelPassword, labelCode, labelCodeValue;
private JTextField tfUser, tfPassword, tfCode;
private JButton buttonLogin, buttonCancel;
public Exp6_01() {
setTitle("登录窗口");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new GridLayout(4, 2));
labelUser = new JLabel("用户名:");
add(labelUser);
tfUser = new JTextField(10);
add(tfUser);
labelPassword = new JLabel("密码:");
add(labelPassword);
tfPassword = new JTextField(10);
add(tfPassword);
labelCode = new JLabel("验证码:");
add(labelCode);
tfCode = new JTextField(10);
add(tfCode);
labelCodeValue = new JLabel(generateCode());
add(labelCodeValue);
buttonLogin = new JButton("登录");
add(buttonLogin);
buttonLogin.addActionListener(this);
buttonCancel = new JButton("取消");
add(buttonCancel);
buttonCancel.addActionListener(this);
setSize(300, 150);
setVisible(true);
}
// 生成4位随机验证码
private String generateCode() {
String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
Random random = new Random();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 4; i++) {
int index = random.nextInt(str.length());
sb.append(str.charAt(index));
}
return sb.toString();
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == buttonLogin) {
String user = tfUser.getText();
String password = tfPassword.getText();
String code = tfCode.getText();
String codeValue = labelCodeValue.getText();
if (user.equals("dgutlisi") && password.equals("123456") && code.equals(codeValue)) {
JOptionPane.showMessageDialog(this, "输入正确,登录成功");
} else {
JOptionPane.showMessageDialog(this, "输入错误,请重新输入");
if (!user.equals("dgutlisi")) {
tfUser.setText("");
}
if (!password.equals("123456")) {
tfPassword.setText("");
}
if (!code.equals(codeValue)) {
tfCode.setText("");
}
labelCodeValue.setText(generateCode());
}
} else if (e.getSource() == buttonCancel) {
System.exit(0);
}
}
public static void main(String[] args) {
new Exp6_01();
}
}
```
运行效果图:
![图6-1 登录窗口](https://img-blog.csdnimg.cn/20220110164410117/6a50c6f8f7c34c6f827635f7a6ac9d24.png)
图6-1 登录窗口
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