jpaneldemo.java

Java 程序设计源码 只提供了部分

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.GridLayout;

public class JPanelDemo extends JFrame{
	private JPanel displayPanel;
	private JPanel inputPanel;
	private JTextField jtfResult;
	private Container container;

	private String labels = "789*456/123-0C=+";

	public JPanelDemo() {
		super("JPanel");
		this.setSize(200,230);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public void setLayout() {
		container = getContentPane();
		container.setLayout(new BorderLayout());

		displayPanel = new JPanel();
		displayPanel.setLayout(new BorderLayout());
		jtfResult = new JTextField();
		displayPanel.add(jtfResult,BorderLayout.CENTER);
		container.add(displayPanel,BorderLayout.NORTH);
		
		inputPanel = new JPanel();
		inputPanel.setLayout(new GridLayout(4,4));
		for(int i = 0; i < labels.length(); i++) {
			JButton jb = new JButton(labels.substring(i,i + 1));
			inputPanel.add(jb);
		}	
		container.add(inputPanel);
	}

	public static void main(String[] args) {
		JPanelDemo jpd = new JPanelDemo();
		jpd.setLayout();
		jpd.setVisible(true);
	}
}