[英]How can activate another gui class with JButton
我有兩個名為Menu和convert的GUI類。 我想點擊“打開”按鈕時運行轉換類。 它看起來很簡單,但我無法理解。
菜單類
package com.ui;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Menu {
private JFrame frame;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Menu window = new Menu();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Menu() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton btnConvert = new JButton("open");
btnConvert.setBounds(44, 52, 89, 23);
btnConvert.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//???
}
});
frame.getContentPane().setLayout(null);
frame.getContentPane().add(btnConvert);
}
}
轉換類
package com.ui;
import java.awt.EventQueue;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.TitledBorder;
import java.awt.Color;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class convert {
private JFrame frmTitle;
private JTextField textField;
private double value;
private ButtonGroup group;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
convert window = new convert();
window.frmTitle.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public convert() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmTitle = new JFrame();
frmTitle.setTitle("TITLE");
frmTitle.setBounds(100, 100, 450, 300);
frmTitle.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmTitle.getContentPane().setLayout(null);
JLabel lblInputValue = new JLabel("Input value:");
lblInputValue.setBounds(29, 22, 79, 14);
frmTitle.getContentPane().add(lblInputValue);
textField = new JTextField();
textField.setBounds(22, 47, 86, 20);
frmTitle.getContentPane().add(textField);
textField.setColumns(10);
JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(null, "Convert", TitledBorder.LEADING, TitledBorder.TOP, null, Color.RED));
panel.setBounds(29, 118, 264, 133);
frmTitle.getContentPane().add(panel);
panel.setLayout(null);
final JRadioButton rdbtnKelvin = new JRadioButton("Kelvin");
rdbtnKelvin.setBounds(6, 30, 67, 23);
panel.add(rdbtnKelvin);
final JRadioButton rdbtnFahrenheit = new JRadioButton("Fahrenheit");
rdbtnFahrenheit.setBounds(71, 30, 77, 23);
panel.add(rdbtnFahrenheit);
final JRadioButton rdbtnCelcius = new JRadioButton("Celcius");
rdbtnCelcius.setBounds(174, 30, 67, 23);
panel.add(rdbtnCelcius);
group = new ButtonGroup();
group.add(rdbtnCelcius);
group.add(rdbtnFahrenheit);
group.add(rdbtnKelvin);
final JComboBox comboBox = new JComboBox();
comboBox.setModel(new DefaultComboBoxModel(new String[] {"Celcius", "Fahrenheit", "Kelvin"}));
comboBox.setBounds(177, 47, 116, 20);
frmTitle.getContentPane().add(comboBox);
JButton btnConvert = new JButton("CONVERT");
btnConvert.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
value = Double.parseDouble(textField.getText().toString());
if(comboBox.getSelectedItem().toString().equals("Celcius")){
if(rdbtnCelcius.isSelected()==true){
value = value;
}
else if (rdbtnFahrenheit.isSelected()==true){
value= 1.8*value +32;
}
else{
value =value+273;
}
}
else if (comboBox.getSelectedItem().toString().equals("Fahrenheit")){
if(rdbtnFahrenheit.isSelected()==true){
value = value;
}
else if (rdbtnCelcius.isSelected()==true){
value= (value-32)*1.8;
}
else{
value =(value-32)/1.8+273;
}
}
else{
if(rdbtnCelcius.isSelected()==true){
value = value-273;
}
else if (rdbtnFahrenheit.isSelected()==true){
value= value -273*1.8+32;
}
else{
value =value;
}
}
textField.setText(value +"");
textField.setEnabled(false);
}
});
btnConvert.setBounds(303, 114, 89, 23);
frmTitle.getContentPane().add(btnConvert);
JButton btnClear = new JButton("CLEAR");
btnClear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText("");
textField.setEnabled(true);
comboBox.setSelectedIndex(0);
rdbtnKelvin.setSelected(true);
}
});
btnClear.setBounds(303, 170, 89, 23);
frmTitle.getContentPane().add(btnClear);
}
}
首先,你的類名應該以大寫字母開頭,所以不應該“轉換”它應該是“轉換”。
在Convert中創建一個公共方法:
public JFrame getFrame() {
return frmTitle;
}
然后在你的按鈕的actionPerformed()方法中,只需:
Convert w = new Convert();
w.getFrame().setVisible(true);
首先,類名和構造函數應該以大寫字母開頭,就像你為class Menu
做的那樣,但不是class convert
。
Java程序應該只有一個且只有一個主要方法用於所有類。 所以,從Convert類中刪除完成你的main方法,把new Convert();
在Menu類的btnConvert的actionPerformed()方法中:
btnConvert.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
new Convert();
}
});
並添加frmTitle.setVisible(true);
到Convert類的initialize()
方法的末尾。
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