Java:使用带有Button的setText()方法时出现问题

时间:2009-10-26 18:52:22

标签: java button applet

我是java的新手,我正在尝试更换我创建的Button上的文本。我的主要类的代码如下:

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.*;

public class TeamProject extends Applet implements ActionListener, MouseListener
{
char[][] charValues = new char[10][10];
Table aTable;
boolean allowUserInput = false;
Button BtnStart;
Button randomChangeBtn;
boolean guessMode;
private AudioClip[] sounds = new AudioClip[5];
private int counter = 0;
//JSObject jso;

public void init()
{
        //setup buttons
    BtnStart = new Button("add row/column");
    BtnStart.addActionListener((ActionListener)this);   //cast
    randomChangeBtn = new Button("change one value");
    randomChangeBtn.addActionListener((ActionListener)this);

            //add button
    this.add(BtnStart);

    //add image to Image objects
    Image imgO = getImage(getCodeBase(), "images/not.gif");
    Image imgX= getImage(getCodeBase(), "images/cross.gif");

            //setup table
    aTable = new Table(100, 100, 75, 55, 5, 5, imgX, imgO);

    //setBackground(Color.LIGHT_GRAY);
    super.resize(700, 700);

            //add mouse listener
    addMouseListener(this);

    //initially guessMode will be false
    guessMode = false;

            //to talk to javascript
    //jso = JSObject.getWindow(this);

    sounds[0] = getAudioClip (getCodeBase(), "images/buzzthruloud.wav");
    sounds[1] = getAudioClip (getCodeBase(), "images/inconceivable4.wav");
    sounds[2] = getAudioClip (getCodeBase(), "images/foghorn.wav");
    sounds[3] = getAudioClip (getCodeBase(), "images/waiting.wav");
    sounds[4] = getAudioClip (getCodeBase(), "images/whistldn.wav");
}

  public void paint(Graphics g)
  {
g.setColor(Color.black);
aTable.draw(g);
  }

  //Mouse listener methods
  public void mousePressed (MouseEvent e)
  {
    if(!guessMode){
  if ((allowUserInput)){
    aTable.swapSquareValue(e.getX(), e.getY());
    repaint();
  }
    }
    else{
      System.out.println("guessed row = " + e.getY() + " guessed col = " + e.getX());
      if(aTable.checkGuess(e.getX(), e.getY())){
        int n = JOptionPane.showConfirmDialog(null, "Excellent!! Would you like to progress to next level",

                                         "Correct!!!", JOptionPane.YES_NO_OPTION);

    if (n == JOpionPane.YES_OPTION) {


               }
 else{

    JOptionPane.showMessageDialog(null, "Nope", "alert", JOptionPane.INFORMATION_MESSAGE);

    sounds[counter].play();

  }



  //repaint();

}



  }



  public void mouseClicked (MouseEvent e) {}

  public void mouseEntered (MouseEvent e) {}

  public void mouseReleased (MouseEvent e) {}

  public void mouseExited (MouseEvent e) {}



  //Button action listener

public void actionPerformed(ActionEvent e)

{

    if (e.getSource() == BtnStart) {

      aTable.addRow();

      aTable.addColumn();

      BtnStart.setText("Roseindia.net");

      //this.remove(BtnStart);

      //this.add(randomChangeBtn);

      super.resize(700, 700);

      repaint();

}

else if (e.getSource() == randomChangeBtn) {

  aTable.randomChangeFunc();

  repaint();

  guessMode = true;

}



    allowUserInput = true;

    System.out.println(aTable.toString());

}



}

我正在尝试在actionPerformed(ActionEvent e)方法中更改为文本。就像我说的,我是新人,所以请保持温柔。谢谢:))

3 个答案:

答案 0 :(得分:4)

您正在使用java.awt.Button。 java.awt.Button中没有setText()方法。您可以改用setLabel(String)

并且您不必导入java.lang。*,因为默认情况下java.lang包可用于所有Java程序。

如果您更改了该行:

 Button BtnStart;

 JButton BtnStart;

 BtnStart = new Button("add row/column");

 BtnStart = new JButton("add row/column");

然后您将使用Swing按钮,您将能够调用setText();

答案 1 :(得分:1)

您需要知道的第一件事是您尝试使用AWT或Swing组件创建Applet。您导入Swing类但使用AWT组件。现在大多数人都使用Swing。

在Swing中,你永远不会覆盖Applet的paint()方法。您可以从扩展JApplet开始,然后只需将组件添加到applet的内容窗格即可。如果您需要进行自定义绘制,那么可以通过覆盖JComponent或JPanel的paintComponent()方法来实现。

首先阅读Swing教程,了解使用applet的工作示例。

答案 2 :(得分:1)

正如你所说想要交换文本那么你应该使用setLabel()方法而不是setText,但是为了更改Label的文本,你可以使用setText()方法。