[英]Java Multiple Checkboxes and Executing Multiple Statements
编程新手,Java是我正在学习的第一门语言。
我在思考正在构建的此应用程序的逻辑时遇到困难。 该应用程序非常简单:它具有五个复选框和一个同步按钮。 选择一个复选框,然后单击“同步”,它会运行与特定复选框关联的cmd命令。
但是,我希望能够选中多个复选框并单击“同步”,使它们全部都可用,而不是一次执行一个。 我目前有一个if语句(如果选中了复选框并且按下了同步按钮)运行“ xyz”命令(与该复选框相对应)。 但是它只在第一个复选框(如果)运行,然后退出。
谢谢!
编辑。 代码如下:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.util.Scanner;
class RcSync extends JFrame implements ActionListener{
Container contentPane = getContentPane();
JPanel top = new JPanel();
JPanel center = new JPanel();
JPanel bottom = new JPanel();
JScrollPane mainScrollFrame = new JScrollPane(center);
JLabel displayMessage = new JLabel("Please select a item, and click sync:");
Font customFontHeader = new Font("", Font.BOLD,15);
JButton syncButton = new JButton("Sync");
JButton cancelButton = new JButton("Cancel");
String[] database = {"Apple","Pineapple","Orange","Pear","Fig"};
JCheckBox chk1 = new JCheckBox(database[0]);
JCheckBox chk2 = new JCheckBox(database[1]);
JCheckBox chk3 = new JCheckBox(database[2]);
JCheckBox chk4 = new JCheckBox(database[3]);
JCheckBox chk5 = new JCheckBox(database[4]);
JCheckBox chk6 = new JCheckBox(database[5]);
public RcSync() {
super ("Sync Application");
setSize (400,450);
setDefaultCloseOperation(EXIT_ON_CLOSE);
add(top);
setVisible(true);
top.add(displayMessage);
displayMessage.setFont(customFontHeader);
center.add(chk1);
center.add(chk2);
center.add(chk3);
center.add(chk4);
center.add(chk5);
bottom.add(syncButton);
syncButton.addActionListener(this);
cancelButton.addActionListener(new CloseListener());
bottom.add(cancelButton);
bottom.add(emailButton);
emailButton.addActionListener(this);
contentPane.add("North", top);
contentPane.add("South", bottom);
this.getContentPane().add(mainScrollFrame, BorderLayout.CENTER);
center.setLayout(new BoxLayout(center, BoxLayout.Y_AXIS));
}
public void actionPerformed(ActionEvent event){
if ((event.getSource() == syncButton) && (chk1.isSelected())) {
try {
Runtime.getRuntime().exec("cmd /c start \"\" C:\\File\\script.bat " + chk1.getText());
} catch (IOException e) {
e.printStackTrace();}
}
if ((event.getSource() == syncButton) && (chk2.isSelected())) {
try {
Runtime.getRuntime().exec("cmd /c start \"\" C:\\File\\script.bat " + chk2.getText());
} catch (IOException e) {
e.printStackTrace();}
}
if ((event.getSource() == syncButton) && (chk3.isSelected())) {
try {
Runtime.getRuntime().exec("cmd /c start \"\" C:\\File\\script.bat " + chk3.getText());
} catch (IOException e) {
e.printStackTrace();}
}
if ((event.getSource() == syncButton) && (chk4.isSelected())) {
try {
Runtime.getRuntime().exec("cmd /c start \"\" C:\\File\\script.bat " + chk4.getText());
} catch (IOException e) {
e.printStackTrace();}
}
if ((event.getSource() == syncButton) && (chk5.isSelected())) {
try {
Runtime.getRuntime().exec("cmd /c start \"\" C:\\File\\script.bat " + chk5.getText());
} catch (IOException e) {
e.printStackTrace();}
}
}
private class CloseListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
public static void main (String[]args){
RsSync gui = new RcSsync();
}
}
}
由于您为问题提供了更多背景信息,因此我已经编辑了我的回复。 粘贴在以下 :是我解决问题的方法,带说明的工作代码以及必须使用关联代码解决的错误:
方法 :为每个复选框关联一个布尔值,该值对应于该选项是否已被“最终用户选择” 。 单击同步按钮后,查找已选中的复选框。 这些复选框将从其isSelected()
方法返回一个真值。 对于每个选定的复选框中添加相关联的命令到含有所有的命令的列表要在最终用户的计算机上运行。 遍历此列表,直到没有剩下要运行的命令为止。
代码 :
import javax.swing.*;
import java.util.ArrayList;
import java.awt.*;
import java.awt.event.*;
import java.util.List;
class RcSync extends JFrame implements ActionListener{
Container contentPane = getContentPane();
JPanel top = new JPanel();
JPanel center = new JPanel();
JPanel bottom = new JPanel();
JScrollPane mainScrollFrame = new JScrollPane(center);
JLabel displayMessage = new JLabel("Please select a item, and click sync:");
Font customFontHeader = new Font("", Font.BOLD,15);
JButton syncButton = new JButton("Sync");
JButton cancelButton = new JButton("Cancel");
// Encapsulate your checkboxes to commands, since there is one
// to one relationship and makes future changes easier since there is a single point of change
String[] database = {"Apple","Pineapple","Orange","Pear","Fig"};
CheckboxCommand chk1 = new CheckboxCommand("Checkbox 1 cmd", new JCheckBox(database[0]));
CheckboxCommand chk2 = new CheckboxCommand("Checkbox 2 cmd", new JCheckBox(database[1]));
CheckboxCommand chk3 = new CheckboxCommand("Checkbox 3 cmd", new JCheckBox(database[2]));
CheckboxCommand chk4 = new CheckboxCommand("Checkbox 4 cmd", new JCheckBox(database[3]));
CheckboxCommand chk5 = new CheckboxCommand("Checkbox 5 cmd", new JCheckBox(database[4]));
public RcSync() {
super ("Sync Application");
setSize (400,450);
setDefaultCloseOperation(EXIT_ON_CLOSE);
add(top);
setVisible(true);
top.add(displayMessage);
displayMessage.setFont(customFontHeader);
center.add(chk1.checkbox);
center.add(chk2.checkbox);
center.add(chk3.checkbox);
center.add(chk4.checkbox);
center.add(chk5.checkbox);
bottom.add(syncButton);
syncButton.addActionListener(this);
cancelButton.addActionListener(new CloseListener());
bottom.add(cancelButton);
// TODO email button doesn't exist, assuming copy/paste error?
// bottom.add(emailButton);
// emailButton.addActionListener(this);
contentPane.add("North", top);
contentPane.add("South", bottom);
this.getContentPane().add(mainScrollFrame, BorderLayout.CENTER);
center.setLayout(new BoxLayout(center, BoxLayout.Y_AXIS));
}
public void actionPerformed(ActionEvent event){
// Implements the approach I described initially
if (event.getSource() == syncButton){
List<String> cmdsToRun = new ArrayList<>();
if (chk1.isSelected()){
cmdsToRun.add(chk1.getCmdToRun());
}
if (chk2.isSelected()){
cmdsToRun.add(chk2.getCmdToRun());
}
if (chk3.isSelected()){
cmdsToRun.add(chk3.getCmdToRun());
}
if (chk4.isSelected()){
cmdsToRun.add(chk4.getCmdToRun());
}
if (chk5.isSelected()){
cmdsToRun.add(chk5.getCmdToRun());
}
// Note: for verification purposes I just print out your commands
// since they're hard coded to your particular environment
System.out.println(cmdsToRun);
// This is where you would loop through your command list i.e.
// for (int x=0; x<cmdsToRun; x++){ //run command at cmdToRun.get(x); }
}
}
private class CloseListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
// encapsulating your checkboxes to commands
private class CheckboxCommand {
private String cmdToRun;
private boolean isSelected;
private JCheckBox checkbox;
public CheckboxCommand(String cmdToRun, JCheckBox checkbox) {
this.cmdToRun = cmdToRun;
this.checkbox = checkbox;
}
public String getCmdToRun() {
return cmdToRun;
}
public void setCmdToRun(String cmdToRun) {
this.cmdToRun = cmdToRun;
}
public boolean isSelected() {
return this.checkbox.isSelected();
}
public void setSelected(boolean selected) {
isSelected = selected;
}
}
public static void main (String[]args){
// Fixed your typo error to run the swing interface
RcSync gui = new RcSync();
}
}
验证正确的代码:
关键见解:由于存在一对一关系 ,因此我将复选框的命令封装到一个私有类中,这将使您的代码具有单个更改点,通常,这是最佳做法:)
旁注: 由于命令与您的特定计算机有关,因此我实际上不会在终端上运行您的命令 。 即与本地脚本相关联,因此我打印出虚拟命令以证明代码功能适当。 我在代码中添加了一个注释块,以显示可以在其中添加环境特定代码的地方,即Runtime.getRuntime().exec("<CMD>");
错误要解决:
我删除了这一行: JCheckBox chk6 = new JCheckBox(database[5]);
因为这将引发indexOutOfBounds异常,因为内存数据库变量中只有5个元素,而不是6个。
emailButton不存在,所以我将其注释掉:
// bottom.add(emailButton);
// emailButton.addActionListener(this);
这是一个错字,不会运行gui: RsSync gui = new RcSsync();
所以我适当地更改了它: RcSync gui = new RcSync();
希望有帮助! :)
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