Demo01
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
public class DemoCalculator {
public static void main(String[] args) {
//创建一个JFrame窗体对象
JFrame jFrame = new JFrame("计算器");
//获取一个容器对象
Container container = jFrame.getContentPane();
//创建一个文本框组件
JTextField jTextField = new JTextField(20);
//获取一个面板对象
JPanel jPanel = new JPanel(new GridLayout(4,4,5,5));
//向面板中添加按钮组件
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));
//创建面板存放文本域组件
JPanel jPanel1 = new JPanel();
jPanel1.add(jTextField);
//设置容器布局为边框布局
container.setLayout(new BorderLayout());
container.add(jPanel1,BorderLayout.NORTH);
container.add(jPanel);
//设置窗体大小,可见,关闭方式
jFrame.setVisible(true);
jFrame.setSize(300,200);
jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
Demo01运行结果如下