jlab1002b.java

Java计算其界面

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class JLab1002B {
	private JFrame frame=new JFrame();
	private String[] COMMANDS = {"Backspace", "CE", "C"};
	private String[] MCOMMANDS = {"MC", "MR", "MS", "M+"};
	private String[] numAndOperations = {"7", "8", "9", "/", "sqrt", "4", "5", "6", "*", "%","1", "2", "3", "-", "1/x", "0", "+/-", ".", "+", "="};
	private JButton[] cb = new JButton[COMMANDS.length];
	private JButton[] mb = new JButton[MCOMMANDS.length];
	private JButton[] nob = new JButton[numAndOperations.length];
	private JButton mFlag = new JButton(" ");
	private TextField resultText = new TextField("");
	public void init() {
		JPanel north = new JPanel();
		north.setLayout(new BorderLayout());
		resultText.setEditable(false);
		resultText.setBackground(Color.white);
		north.add(resultText, BorderLayout.CENTER);
		JPanel command = new JPanel();
		command.setLayout(new GridLayout(1, 3, 3, 3));
		for (int i = 0;i < COMMANDS.length ;i++ )
		{
			cb[i] = new JButton(COMMANDS[i]);
			cb[i].setForeground(Color.red);
			command.add(cb[i]);
		}
		JPanel keyPad = new JPanel();
		keyPad.setLayout(new GridLayout(4, 5, 3, 3));
		for (int i =0 ;i < numAndOperations.length ;i++ )
		{
			nob[i] = new JButton(numAndOperations[i]);
			nob[i].setForeground(Color.blue);
			keyPad.add(nob[i]);
		}
		nob[3].setForeground(Color.red);
		nob[8].setForeground(Color.red);
		nob[13].setForeground(Color.red);
		nob[18].setForeground(Color.red);
		nob[19].setForeground(Color.red);
		JPanel m = new JPanel();
		m.setLayout(new GridLayout(4, 1, 3, 3));
		for (int i =0;i < MCOMMANDS.length ;i++ )
		{
			mb[i] = new JButton(MCOMMANDS[i]);
			mb[i].setForeground(Color.red);
			m.add(mb[i]);
		}
		JPanel left = new JPanel();
		left.setLayout(new BorderLayout(3, 5));
		left.add(mFlag, BorderLayout.NORTH);
		left.add(m, BorderLayout.CENTER);
		JPanel main = new JPanel();
		main.setLayout(new BorderLayout(3, 5));
		main.add(command, BorderLayout.NORTH);
		main.add(keyPad, BorderLayout.CENTER);
		frame.setLayout(new BorderLayout(3, 5));
		frame.add(north, BorderLayout.NORTH);
		frame.add(left, BorderLayout.WEST);
		frame.add(main, BorderLayout.CENTER);
		frame.setResizable(false);
		frame.setBackground(Color.LIGHT_GRAY);
		frame.pack();
		frame.setLocation(300,200);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) {
		new JLab1002B().init();
	}
}