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单击按钮后，我试图将按钮添加到主面板，目前只设置了开胃菜，

第二件事是GridLayout我的 mainAppPanel 不工作，行、vgap 和 hgap 工作但列不工作。

请告诉我可以做什么。

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    class sushi implements ActionListener
    {   
    private JFrame frame;
    private JPanel appPanel;
    private JPanel sideAppPanel;
    private JPanel mainAppPanel;

    private JButton appItemButton1;
    private JButton appItemButton2;
    private JButton appItemButton4;
    private JButton appItemButton5;
    private JButton appItemButton6;
    private JButton appItemButton7;
    private JButton appItemButton8;
    private JButton appItemButton9;
    private JButton appButton;
    private JButton mainButton;
    private JButton sidesButton;
    private JButton dessertButton;
    private JButton drinksButton;
    private JButton totalButton;

    private JLabel blank1;
    private JLabel blank2;
    private JLabel blank3;
    private JLabel blank4;
    private JLabel blank5;
    private JLabel blank6;
    private JLabel blank7;
    private JLabel blank8;
    private JLabel blank9;
    private JLabel blank10;
    private JLabel blank11;
    private JLabel blank12;
    private JLabel blank13;
    private JLabel blank14;
    private JLabel blank15;
    private JLabel blank16;
    private JLabel blank17; 
    private JLabel blank18;
    private JLabel blank19;


    public static void main(String args[])
    {
    sushi lol=new sushi();
    }


    public sushi()
    {

//frame settings
frame=new JFrame("sushi master");
frame.setSize(700,700);
frame.setResizable(false);
frame.setLocation(300,100);
frame.setVisible(true);
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.setLayout(null);

 //sidepanel
sideAppPanel=new JPanel();
sideAppPanel.setSize(100,700);
sideAppPanel.setBackground(Color.red);
sideAppPanel.setLocation(0,0);
sideAppPanel.setLayout(new GridLayout(18,0));
frame.add(sideAppPanel);

//items in side panel
 appButton=new JButton("Appetizer");
 mainButton=new JButton("Main course");
 sidesButton=new JButton("Sides");
 drinksButton=new JButton("Drinks");
 totalButton=new JButton("Total");
 blank1=new JLabel(" ");
 blank2=new JLabel(" ");
 blank3=new JLabel(" ");
 blank4=new JLabel(" ");
 blank5=new JLabel("");

 sideAppPanel.add(blank1);
 sideAppPanel.add(appButton);
 sideAppPanel.add(blank2);
 sideAppPanel.add(mainButton);
 sideAppPanel.add(blank3);
 sideAppPanel.add(sidesButton);
 sideAppPanel.add(blank4);
 sideAppPanel.add(drinksButton);
 sideAppPanel.add(blank5);
 sideAppPanel.add(totalButton);

//items in main panel
blank5=new JLabel(" ");
blank6=new JLabel(" ");
blank7=new JLabel(" ");
blank8=new JLabel(" ");
blank9=new JLabel(" ");
blank10=new JLabel(" ");
blank11=new JLabel(" ");
blank12=new JLabel(" ");
blank13=new JLabel(" ");
blank14=new JLabel(" ");
blank15=new JLabel(" ");
blank16=new JLabel(" ");

appItemButton1=new JButton("1");
appItemButton2=new JButton("2");
appItemButton3=new JButton("3");
appItemButton4=new JButton("4");

appItemButton5=new JButton("5");
appItemButton6=new JButton("6");
appItemButton7=new JButton("7");
appItemButton8=new JButton("8");
appItemButton9=new JButton("9");

//adding action listening to side panel buttons
appButton.addActionListener(this);


    }   

    public void actionPerformed(ActionEvent event){
if(event.getSource()==appButton)
{   
mainAppPanel=new JPanel();
mainAppPanel.setSize(600,700);
mainAppPanel.setLocation(100,0);
mainAppPanel.setBackground(Color.blue);
mainAppPanel.setLayout(new GridLayout(5,4,20,20));
frame.add(mainAppPanel);
appItemButton1=new JButton("1");
appItemButton2=new JButton("2");
appItemButton3=new JButton("3");
appItemButton4=new JButton("4");

appItemButton5=new JButton("5");
appItemButton6=new JButton("6");
appItemButton7=new JButton("7");
appItemButton8=new JButton("8");
appItemButton9=new JButton("9");

mainAppPanel.add(appItemButton1);
mainAppPanel.add(appItemButton2);
mainAppPanel.add(appItemButton3);
mainAppPanel.add(appItemButton4);
mainAppPanel.add(appItemButton5);
mainAppPanel.add(appItemButton6);
mainAppPanel.add(appItemButton7);
mainAppPanel.add(appItemButton8);
mainAppPanel.add(appItemButton9);
mainAppPanel.add(blank5);
mainAppPanel.add(blank6);
mainAppPanel.add(blank7);

}
    }   

    }
4

1 回答 1

0

我发现了一些要点：

你还没有定义

private JButton appItemButton3;

您的 actionlistener 可以工作，但您必须验证对框架的更改。

frame.validate();

你使用eclipse还是netbeans ide？它有助于格式化代码并显示一些错误或命名约定，例如：类名大写

class Sushi implements ActionListener

不要使用空布局。您可以使用 Borderlayout 来处理所有元素。

这应该可以，但我认为你应该寻找一些教程来了解更多关于摇摆的信息：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Sushi implements ActionListener {
private JFrame frame;
private JPanel appPanel;
private JPanel sideAppPanel;
private JPanel mainAppPanel;

private JButton appItemButton1;
private JButton appItemButton2;
private JButton appItemButton3; //added
private JButton appItemButton4;
private JButton appItemButton5;
private JButton appItemButton6;
private JButton appItemButton7;
private JButton appItemButton8;
private JButton appItemButton9;
private JButton appButton;
private JButton mainButton;
private JButton sidesButton;
private JButton dessertButton;
private JButton drinksButton;
private JButton totalButton;

private JLabel blank1;
private JLabel blank2;
private JLabel blank3;
private JLabel blank4;
private JLabel blank5;
private JLabel blank6;
private JLabel blank7;
private JLabel blank8;
private JLabel blank9;
private JLabel blank10;
private JLabel blank11;
private JLabel blank12;
private JLabel blank13;
private JLabel blank14;
private JLabel blank15;
private JLabel blank16;
private JLabel blank17;
private JLabel blank18;
private JLabel blank19;



public static void main(String args[]) {
    Sushi lol = new Sushi();
}

public Sushi() {

    // frame settings
    frame = new JFrame("sushi master");
    frame.setSize(700, 700);
    frame.setResizable(false);
    frame.setLocation(300, 100);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());    //changed

    // sidepanel
    sideAppPanel = new JPanel();
    sideAppPanel.setSize(100, 700);
    sideAppPanel.setBackground(Color.red);
    sideAppPanel.setLocation(0, 0);
    sideAppPanel.setLayout(new GridLayout(18, 0));
    frame.add(sideAppPanel, BorderLayout.WEST); //changed

    // items in side panel
    appButton = new JButton("Appetizer");
    mainButton = new JButton("Main course");
    sidesButton = new JButton("Sides");
    drinksButton = new JButton("Drinks");
    totalButton = new JButton("Total");
    blank1 = new JLabel(" ");
    blank2 = new JLabel(" ");
    blank3 = new JLabel(" ");
    blank4 = new JLabel(" ");
    blank5 = new JLabel("");

    sideAppPanel.add(blank1);
    sideAppPanel.add(appButton);
    sideAppPanel.add(blank2);
    sideAppPanel.add(mainButton);
    sideAppPanel.add(blank3);
    sideAppPanel.add(sidesButton);
    sideAppPanel.add(blank4);
    sideAppPanel.add(drinksButton);
    sideAppPanel.add(blank5);
    sideAppPanel.add(totalButton);

    // items in main panel
    blank5 = new JLabel(" ");
    blank6 = new JLabel(" ");
    blank7 = new JLabel(" ");
    blank8 = new JLabel(" ");
    blank9 = new JLabel(" ");
    blank10 = new JLabel(" ");
    blank11 = new JLabel(" ");
    blank12 = new JLabel(" ");
    blank13 = new JLabel(" ");
    blank14 = new JLabel(" ");
    blank15 = new JLabel(" ");
    blank16 = new JLabel(" ");

    appItemButton1 = new JButton("1");
    appItemButton2 = new JButton("2");
    appItemButton3 = new JButton("3");
    appItemButton4 = new JButton("4");

    appItemButton5 = new JButton("5");
    appItemButton6 = new JButton("6");
    appItemButton7 = new JButton("7");
    appItemButton8 = new JButton("8");
    appItemButton9 = new JButton("9");

    // adding action listening to side panel buttons
    appButton.addActionListener(this);

}

public void actionPerformed(ActionEvent event) {
    if (event.getSource() == appButton) {
        mainAppPanel = new JPanel();
        mainAppPanel.setSize(600, 700);
        mainAppPanel.setLocation(100, 0);
        mainAppPanel.setBackground(Color.blue);
        mainAppPanel.setLayout(new GridLayout(5, 4, 20, 20));
        frame.add(mainAppPanel, BorderLayout.CENTER);   //changed
        appItemButton1 = new JButton("1");
        appItemButton2 = new JButton("2");
        appItemButton3 = new JButton("3");
        appItemButton4 = new JButton("4");

        appItemButton5 = new JButton("5");
        appItemButton6 = new JButton("6");
        appItemButton7 = new JButton("7");
        appItemButton8 = new JButton("8");
        appItemButton9 = new JButton("9");

        mainAppPanel.add(appItemButton1);
        mainAppPanel.add(appItemButton2);
        mainAppPanel.add(appItemButton3);
        mainAppPanel.add(appItemButton4);
        mainAppPanel.add(appItemButton5);
        mainAppPanel.add(appItemButton6);
        mainAppPanel.add(appItemButton7);
        mainAppPanel.add(appItemButton8);
        mainAppPanel.add(appItemButton9);
        mainAppPanel.add(blank5);
        mainAppPanel.add(blank6);
        mainAppPanel.add(blank7);

        frame.validate();   //added
    }
}
}
于 2013-06-12T13:09:36.297 回答