Swing實操--計算器界面的實現

Demo01

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;

public class DemoCalculator {
    public static void main(String[] args) {
        //創建一個JFrame窗體對象
        JFrame jFrame = new JFrame("計算器");
        //獲取一個容器對象
        Container container = jFrame.getContentPane();
        //創建一個文本框組件
        JTextField jTextField = new JTextField(20);
        //獲取一個面板對象
        JPanel jPanel = new JPanel(new GridLayout(4,4,5,5));
        //向面板中添加按鈕組件
        jPanel.add(new JButton("7"));
        jPanel.add(new JButton("8"));
        jPanel.add(new JButton("9"));
        jPanel.add(new JButton("/"));
        jPanel.add(new JButton("4"));
        jPanel.add(new JButton("5"));
        jPanel.add(new JButton("6"));
        jPanel.add(new JButton("*"));
        jPanel.add(new JButton("1"));
        jPanel.add(new JButton("2"));
        jPanel.add(new JButton("3"));
        jPanel.add(new JButton("-"));
        jPanel.add(new JButton("0"));
        jPanel.add(new JButton("."));
        jPanel.add(new JButton("="));
        jPanel.add(new JButton("+"));
        jPanel.setBorder(new EmptyBorder(5,5,5,5));

        //創建面板存放文本域組件
        JPanel jPanel1 = new JPanel();
        jPanel1.add(jTextField);

        //設置容器佈局爲邊框佈局
        container.setLayout(new BorderLayout());
        container.add(jPanel1,BorderLayout.NORTH);
        container.add(jPanel);

        //設置窗體大小，可見，關閉方式
        jFrame.setVisible(true);
        jFrame.setSize(300,200);
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

Demo01運行結果如下