我尝试在很多方面解决这个问题，并尝试到处寻找答案，我的颜色按钮正常工作，但同样的内置数字按钮也不行....
package tralala;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.awt.*;
public class DugmiciKojiMenjajuBoju extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 4317497849622426733L;
private JButton dugme1;
private JButton dugme2;
private JButton dugme3;
private JPanel panel;
private JOptionPane a;
private JPanel panel1;
private JButton dugmeBroja0;
private JButton dugmeBroja1;
private JButton dugmeBroja2;
private JButton dugmeBroja3;
private JButton dugmeBroja4;
private JButton dugmeBroja5;
private JButton dugmeBroja6;
private JButton dugmeBroja7;
private JButton dugmeBroja8;
private JButton dugmeBroja9;
private JButton dugmeZaPlus;
private JButton dugmeZaMinus;
private JButton dugmeZaPuta;
private JButton dugmeZaPodeljeno;
private JButton dugmeZaJednako;
private JTextField polje;
DugmiciKojiMenjajuBoju(){
getContentPane().setBackground(Color.white);
this.setLayout(new FlowLayout());
a = new JOptionPane("");
dugme1 = new JButton("zuta");
dugme2 = new JButton("plava");
dugme3 = new JButton("crvena");
dugmeBroja0 = new JButton("0");
dugmeBroja1 = new JButton("1");
dugmeBroja2 = new JButton("2");
dugmeBroja3 = new JButton("3");
dugmeBroja4 = new JButton("4");
dugmeBroja5 = new JButton("5");
dugmeBroja6 = new JButton("6");
dugmeBroja7 = new JButton("7");
dugmeBroja8 = new JButton("8");
dugmeBroja9 = new JButton("9");
dugmeZaPlus = new JButton("+");
dugmeZaMinus = new JButton("-");
dugmeZaPuta = new JButton("*");
dugmeZaPodeljeno = new JButton("/");
dugmeZaJednako = new JButton("=");
polje = new JTextField("", 20);
panel = new JPanel();
panel1 = new JPanel();
dugmeBroja0.setSize(50,50);
dugmeBroja1.setSize(50,50);
dugmeBroja2.setSize(50,50);
dugmeBroja3.setSize(50,50);
dugmeBroja4.setSize(50,50);
dugmeBroja5.setSize(50,50);
dugmeBroja6.setSize(50,50);
dugmeBroja7.setSize(50,50);
dugmeBroja8.setSize(50,50);
dugmeBroja9.setSize(50,50);
panel1.add(dugmeBroja0);
panel1.add(dugmeBroja1);
panel1.add(dugmeBroja2);
panel1.add(dugmeBroja3);
panel1.add(dugmeBroja4);
panel1.add(dugmeBroja5);
panel1.add(dugmeBroja6);
panel1.add(dugmeBroja7);
panel1.add(dugmeBroja8);
panel1.add(dugmeBroja9);
panel1.add(dugmeZaPlus);
panel1.add(dugmeZaMinus);
panel1.add(dugmeZaPuta);
panel1.add(dugmeZaPodeljeno);
panel1.add(dugmeZaJednako);
panel1.add(polje);
panel1.setLayout(new FlowLayout(50, 0 ,0));
FlowLayout mojLayout = new FlowLayout(FlowLayout.CENTER , 20 , 20);
panel.setLayout(mojLayout);
panel.add(dugme1);
panel.add(dugme2);
panel.add(dugme3);
this.setTitle("Kalkulator Koji Menja Boju Pozadine");
this.setSize(500,500);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.add(panel1);
this.add(panel);
dugme1.addActionListener(this);
dugme2.addActionListener(this);
dugme3.addActionListener(this);
polje.addActionListener(this);
panel.setBackground(Color.white);
panel1.setBackground(Color.white);
}
public static void main(String[] args) {
DugmiciKojiMenjajuBoju a = new DugmiciKojiMenjajuBoju();
a.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent arg0) {
if( arg0.getSource() == dugme1){
panel.setBackground(Color.yellow);
panel1.setBackground(Color.yellow);
getContentPane().setBackground(Color.yellow);
a.setSize(200,200);
a.showMessageDialog(this, "Klikcite dalje :D" ,"Postavili ste zutu",JOptionPane.INFORMATION_MESSAGE);
}
else if(arg0.getSource() == dugme2){
panel.setBackground(Color.blue);
panel1.setBackground(Color.blue);
getContentPane().setBackground(Color.blue);
a.setSize(200,200);
a.showMessageDialog(this, "Klikcite dalje :D","Postavili ste plavu", JOptionPane.INFORMATION_MESSAGE);
}
else if(arg0.getSource() == dugme3){
panel.setBackground(Color.red);
panel1.setBackground(Color.red);
getContentPane().setBackground(Color.red);
a.setSize(200,200);
a.showMessageDialog(this, "Klikcite dalje :D","Postavili ste crvenu",JOptionPane.INFORMATION_MESSAGE);
}
else if(arg0.getSource() == dugmeBroja0){
polje.setText("0");
System.out.println("blabla");
}
}
}
我的按钮0无效...所以我无法继续编写代码。
答案 0 :(得分：3)
我的按钮0无效...所以我无法继续编写代码。
您没有向按钮添加ActionListener。
但是，在修复该问题之前，您应该简化代码，学习如何使用循环来创建具有相同功能的多个组件。下面是一个创建单个ActionListener并将其添加到每个按钮的示例：
registerReceiver(onComplete,
new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
另外，请勿在您的组件上使用import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class CalculatorPanel extends JPanel
{
private JTextField display;
public CalculatorPanel()
{
Action numberAction = new AbstractAction()
{
@Override
public void actionPerformed(ActionEvent e)
{
// display.setCaretPosition( display.getDocument().getLength() );
display.replaceSelection(e.getActionCommand());
}
};
setLayout( new BorderLayout() );
display = new JTextField();
display.setEditable( false );
display.setHorizontalAlignment(JTextField.RIGHT);
add(display, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout( new GridLayout(0, 5) );
add(buttonPanel, BorderLayout.CENTER);
for (int i = 0; i < 10; i++)
{
String text = String.valueOf(i);
JButton button = new JButton( text );
button.addActionListener( numberAction );
button.setBorder( new LineBorder(Color.BLACK) );
button.setPreferredSize( new Dimension(50, 50) );
buttonPanel.add( button );
}
}
private static void createAndShowUI()
{
JFrame frame = new JFrame("Calculator Panel");
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.add( new CalculatorPanel() );
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
。布局管理器负责确定组件的大小。
答案 1 :(得分：1)
您从未将ActionListener添加到该按钮，只有三个颜色按钮和一个JTextField polje
答案 2 :(得分：1)
我认为你没有添加this作为dugmeBroja0的actionListener：
你需要这个：
dugmeBroja0.addActionListener(this);