计算器(功能有数字反序，文字竖排，二进制查看器等)

<strong><span style="font-size: 13px;">import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Exer extends JFrame {
	final JButton[] buttons = new JButton[11];
	final JTextField field = new JTextField(20);
	final JPanel[] panels = new JPanel[2];
	final JLabel label = new JLabel();
	final JTextArea area = new JTextArea(10, 80);
	final JScrollPane pane = new JScrollPane(area);
	final JCheckBox[] boxs = new JCheckBox[6];
	final JRadioButton[] radioButtons = new JRadioButton[2];
	final ButtonGroup group = new ButtonGroup();
	final int num = (int) (Math.random() * 10);
	private Object[] data;
	private int top;
	private int i = 9;
	private boolean flag;

	public Exer(String title) {
		super(title);
		buttons[0] = new JButton("反序");
		buttons[1] = new JButton("乘法表");
		buttons[2] = new JButton("奇数分母之和");
		buttons[3] = new JButton("金字塔");
		buttons[4] = new JButton("入栈");
		buttons[5] = new JButton("出栈");
		buttons[6] = new JButton("素数/偶数");
		buttons[7] = new JButton("文字竖排");
		buttons[8] = new JButton("二进制");
		buttons[9] = new JButton("猜数");
		buttons[10] = new JButton("清空");
		boxs[0] = new JCheckBox("千位大于百位");
		boxs[1] = new JCheckBox("十位大于个位");
		boxs[2] = new JCheckBox("千位与个位之后等于百位与十位之后");
		boxs[3] = new JCheckBox("百位是奇数");
		boxs[4] = new JCheckBox("全选");
		boxs[5] = new JCheckBox("全删");
		radioButtons[0] = new JRadioButton("算法一", true);
		radioButtons[1] = new JRadioButton("算法二");
		for (int i = 0; i < radioButtons.length; i++) {
			group.add(radioButtons[i]);
		}

		for (int i = 0; i < panels.length; i++) {
			panels[i] = new JPanel();

		}
		panels[0].setLayout(new GridLayout(2, 5));
		panels[1].setLayout(new FlowLayout(FlowLayout.LEFT));
		panels[0].add(field);

		for (int i = 0; i < buttons.length; i++) {
			panels[0].add(buttons[i]);
		}
		for (int i = 0; i < radioButtons.length; i++) {
			panels[1].add(radioButtons[i]);
		}

		for (int i = 0; i < boxs.length; i++) {
			panels[1].add(boxs[i]);
			boxs[i].addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					boolean b = boxs[0].isSelected() && boxs[1].isSelected()
							&& boxs[2].isSelected() && boxs[3].isSelected();
					field.setText(b && flag ? numNumber() + "" : "");
					field.setText(b && !flag ? numNumber2() + "" : "");
					if (boxs[4].isSelected()) {
						for (int j = 0; j < boxs.length - 1; j++) {
							boxs[j].setSelected(true);
						}
						field.setText(numNumber() + "");
						if (flag) {
							field.setText(numNumber2() + "");
						}

					}
					if (boxs[5].isSelected()) {
						for (int j = 0; j < boxs.length - 1; j++) {
							boxs[j].setSelected(false);
						}
						field.setText("");
					}
				}
			});
		}
		panels[0].add(label);
		add(panels[0], BorderLayout.NORTH);
		add(pane, BorderLayout.CENTER);
		add(panels[1], BorderLayout.SOUTH);
		field.addKeyListener(new KeyAdapter() {
			public void keyTyped(KeyEvent e) {
				label.setText("");
			}
		});
		field.addMouseListener(new MouseAdapter() {
			public void mouseEntered(MouseEvent e) {
				label.setText("please input your number:");
			}

			public void mouseExited(MouseEvent e) {
				label.setText("");
			}

		});
		buttons[0].addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String string = field.getText().trim();
				try {
					field.setText(reverse(Integer.parseInt(string)) + "");
				} catch (NumberFormatException e1) {
					label.setText("不是数字");
				}
			}
		});
		buttons[1].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				String string = field.getText().trim();
				if (area.getText() != "") {
					area.setText("");
				}
				try {
					nine(Integer.parseInt(string));
				} catch (NumberFormatException e1) {
					label.setText("不是数字");
				}

			}
		});
		buttons[2].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				String string = field.getText().trim();
				try {
					field.setText(numerator(Integer.parseInt(string)) + "");
				} catch (NumberFormatException e1) {
					label.setText("不是数字");

				}

			}
		});
		buttons[3].addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {

				String string = field.getText().trim();
				try {
					triangle(Integer.parseInt(string));
				} catch (NumberFormatException e1) {
					label.setText("不是数字");
				}

			}
		});
		buttons[4].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				if (push(field.getText()) == null) {
					label.setText("入栈失败，栈空间已满！");
					return;
				}

				area.append("入栈:" + field.getText() + "\n");
			}

		});
		buttons[5].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				if (pop() == null) {
					label.setText("出栈失败，栈空间已空！");
					return;
				}
				area.append("出栈:" + field.getText() + "\n");
			}
		});
		buttons[6].addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {

				String string = field.getText().trim();
				try {
					if (isPrimeNumber(Integer.parseInt(string))) {
						label.setText(field.getText().trim() + "是素数");
					} else {
						label.setText(field.getText().trim() + "是偶数");
					}

				} catch (NumberFormatException e1) {
					label.setText("不是数字");
				}

			}
		});
		buttons[7].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				String s = area.getText();
				char[][] arr = new char[4][7];
				tang(arr, s);
			}
		});
		buttons[8].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				String string = field.getText().trim();
				try {

					field.setText(binary(Integer.parseInt(string)));
				} catch (NumberFormatException e1) {
					label.setText("不是数字");
				}

			}
		});
		buttons[9].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				String string = field.getText().trim();
				try {
					guess(Integer.parseInt(string));
				} catch (NumberFormatException e1) {
					label.setText("不是数字");
				}

			}
		});
		buttons[10].addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				field.setText("");
				area.setText("");
			}
		});
		radioButtons[0].addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (radioButtons[0].isSelected()) {
					flag = true;
				}

			}
		});
		radioButtons[1].addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (radioButtons[1].isSelected()) {
					flag = false;
				}
			}
		});
		area.addMouseListener(new MouseAdapter() {

			@Override
			public void mouseClicked(MouseEvent e) {
				area.setText("");
			}
		});
		pack();
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
	}
	public Exer(String title, int size) {
		this(title);
		data = new Object[size];
		top = 0;
	}
	public static void main(String[] args) {
		Exer exer = new Exer("计算器", 3);

	}
	private Object push(Object object) {
		if (top == data.length) {
			return null;
		}
		data[top++] = object;
		return object;
	}
	private Object pop() {
		if (top == 0) {
			return null;
		}
		return data[--top];
	}
	private int reverse(int n) {
		int oldInteger = n;
		int newInteger = 0;
		for (; oldInteger != 0; oldInteger /= 10) {
			newInteger = newInteger * 10 + oldInteger % 10;
		}
		return newInteger;

	}
	private void nine(int n) {

		for (int i = 1, j = 1; j <= n; i++) {
			area.append(j + "*" + i + "=" + (i * j) + "\t");
			if (i == j) {
				i = 0;
				j++;
				area.append("\n");
			}
		}
	}
	private double numerator(int n) {
		double sum = 0.0;
		for (int i = 1, d = 1; i <= n; i++, d = -d) {
			sum += d * 1.0 / (2 * i - 1);
		}
		return sum;
	}
	private void triangle(int n) {

		for (int i = 1; i <= n; i++) {
			for (int j = 0; j < n - i; j++) {
				area.append(" ");
			}
			for (int j = 0; j < 2 * i - 1; j++) {
				area.append("*");
			}
			area.append("\n");

		}
	}
	private int numNumber2() {
		for (int i = 1000; i <= 9999; i++) {
			int q = i / 1000;
			int b = i / 100 % 10;
			int s = i / 10 % 10;
			int g = i % 10;
			boolean flag = q > b && s > g && q + g == b + s && b % 2 != 0;
			if (flag) {
				return i;
			}
		}
		return 0;
	}
	private int numNumber() {
		boolean flag;
		int num = 0;
		loop1: for (int q = 1; q <= 9; q++) {
			loop2: for (int b = 0; b <= 9; b++) {
				if (b << 1 == 0 || q <= b) {
					continue loop2;
				}
				for (int s = 0; s <= 9; s++) {

					for (int g = 0; g <= 9; g++) {
						flag = s > g && q + g == b + s;
						if (flag) {

							num = q * 1000 + b * 100 + s * 10 + g;
							break loop1;
						}
					}
				}
			}
		}
		return num;
	}
	private boolean isPrimeNumber(int n) {
		for (int i = 2; i <= n / 2; i++) {
			if (n % i == 0) {
				return false;
			}

		}
		return true;
	}
	private void tang(char[][] arr, String s) {
		area.setText("");
		for (int i = 0; i < arr.length; i++) {
			for (int j = 0; j < arr[i].length; j++) {
				arr[i][j] = s.charAt(i * arr[i].length + j);
			}
		}
		for (int i = 0; i < arr[0].length; i++) {
			for (int j = 0; j < arr.length; j++) {
				area.append(arr[arr.length - j - 1][i] + "  ");
			}
			area.append("\n");
		}
	}
	private String binary(int n) {
		StringBuffer buffer = new StringBuffer();
		int num;
		for (int i = 31; i >= 0; i--) {
			num = (n & (1 << i)) != 0 ? 1 : 0;
			buffer.append(num);
			if ((32 - i) % 8 == 0) {
				buffer.append(" ");
			}
		}
		return buffer.toString();
	}
	private void guess(int m) {
		if (area.getText() != "") {
			area.setText("");
		}
		int n = m;
		if (n > num) {
			area.append("Too large!");
		} else if (n < num) {
			area.append("Too small!");
		} else {
			area.append("You are Right!");
			return;
		}

		if (i > 0) {
			label.setText("还有" + i + "次机会！");
		}
		if (n != num && i == 0) {
			label.setText("下次再来吧");
			return;
		}
		i--;
	}
}
</span></strong>