java - JPanel未出现在JFrame上

我已经为我的骰子游戏创建了一个基本的UI。但是我的面板没有出现在JFrame中。请帮我修复它。我是Java Swing的新手。

package View;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/**
 *
 * @author Akila
 */
public class MainUi extends JFrame {
    public MainUi(){
        initComponents();
    }

    public void initComponents() {
        setTitle("Dice Game");
        setVisible(true);
        setSize(500, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setResizable(true);
        Container c = getContentPane();

//        *******First Row Components*******
        JPanel firstRow = new JPanel();

        JLabel pc = new JLabel("PC Score");
        JLabel user = new JLabel("User Score");
        JLabel pcScore = new JLabel();
        JLabel userScore = new JLabel();


//        *******Second Row Components*******
        JPanel secondRow = new JPanel();

        JLabel pcFirstDice = new JLabel();
        JLabel pcSecondDice = new JLabel();
        JLabel pcThirdDice = new JLabel();
        JLabel pcFourthDice = new JLabel();
        JLabel pcFifthDice = new JLabel();

        JCheckBox checkPcFirstDice = new JCheckBox();
        JCheckBox checkPcSecondDice = new JCheckBox();
        JCheckBox checkPcThirdDice = new JCheckBox();
        JCheckBox checkPcFourthDice = new JCheckBox();
        JCheckBox checkPcFifthDice = new JCheckBox();

//        *******Third Row Components*******
        JPanel thirdRow = new JPanel();

        JLabel userFirstDice = new JLabel();
        JLabel userSecondDice = new JLabel();
        JLabel userThirdDice = new JLabel();
        JLabel userFourthDice = new JLabel();
        JLabel userFifthDice = new JLabel();

        JCheckBox checkUserFirstDice = new JCheckBox();
        JCheckBox checkUserSecondDice = new JCheckBox();
        JCheckBox checkUserThirdDice = new JCheckBox();
        JCheckBox checkUserFourthDice = new JCheckBox();
        JCheckBox checkUserFifthDice = new JCheckBox();

//        *******Fourth Row Components*******
        JPanel fourthRow = new JPanel();

        JButton throwDice = new JButton("Throw");
        JButton updateScore = new JButton("Update Score");

//        *******First Row GridBag Layout*******
        firstRow.setSize(400, 100);
        firstRow.setLayout(new GridBagLayout());
        GridBagConstraints first = new GridBagConstraints();
        first.weightx = 1;
        first.weighty = 0.25;

//        Add First Row Components
        first.gridx = 1;
        first.gridy = 0;
        firstRow.add(pcScore,first);
        c.add(firstRow,BorderLayout.NORTH);
    }
}

最佳答案

您在这里遇到两个问题：


您忘记将行添加到框架：

    c.add(secondRow);
    c.add(thirdRow);
    c.add(fourthRow)
    c.add(firstRow);

您忘记将内容添加到行中（例如第一行的示例）：

//        *******First Row Components*******
JPanel firstRow = new JPanel();

JLabel pc = new JLabel("PC Score");
JLabel user = new JLabel("User Score");
JLabel pcScore = new JLabel();
JLabel userScore = new JLabel();

firstRow.add(pc);
firstRow.add(user);
firstRow.add(pcScore);
firstRow.add(userScore);

希望有帮助！