[英]Java Multiple Checkboxes and Executing Multiple Statements
編程新手,Java是我正在學習的第一門語言。
我在思考正在構建的此應用程序的邏輯時遇到困難。 該應用程序非常簡單:它具有五個復選框和一個同步按鈕。 選擇一個復選框,然后單擊“同步”,它會運行與特定復選框關聯的cmd命令。
但是,我希望能夠選中多個復選框並單擊“同步”,使它們全部都可用,而不是一次執行一個。 我目前有一個if語句(如果選中了復選框並且按下了同步按鈕)運行“ xyz”命令(與該復選框相對應)。 但是它只在第一個復選框(如果)運行,然后退出。
謝謝!
編輯。 代碼如下:
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();
}
}
}
由於您為問題提供了更多背景信息,因此我已經編輯了我的回復。 粘貼在以下 :是我解決問題的方法,帶說明的工作代碼以及必須使用關聯代碼解決的錯誤:
方法 :為每個復選框關聯一個布爾值,該值對應於該選項是否已被“最終用戶選擇” 。 單擊同步按鈕后,查找已選中的復選框。 這些復選框將從其isSelected()
方法返回一個真值。 對於每個選定的復選框中添加相關聯的命令到含有所有的命令的列表要在最終用戶的計算機上運行。 遍歷此列表,直到沒有剩下要運行的命令為止。
代碼 :
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();
}
}
驗證正確的代碼:
關鍵見解:由於存在一對一關系 ,因此我將復選框的命令封裝到一個私有類中,這將使您的代碼具有單個更改點,通常,這是最佳做法:)
旁注: 由於命令與您的特定計算機有關,因此我實際上不會在終端上運行您的命令 。 即與本地腳本相關聯,因此我打印出虛擬命令以證明代碼功能適當。 我在代碼中添加了一個注釋塊,以顯示可以在其中添加環境特定代碼的地方,即Runtime.getRuntime().exec("<CMD>");
錯誤要解決:
我刪除了這一行: JCheckBox chk6 = new JCheckBox(database[5]);
因為這將引發indexOutOfBounds異常,因為內存數據庫變量中只有5個元素,而不是6個。
emailButton不存在,所以我將其注釋掉:
// bottom.add(emailButton);
// emailButton.addActionListener(this);
這是一個錯字,不會運行gui: RsSync gui = new RcSsync();
所以我適當地更改了它: RcSync gui = new RcSync();
希望有幫助! :)
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