浮点数查看器

<strong><span style="font-size: 13px;">import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class ShowFloatBit extends JFrame implements ActionListener {
	final JTextField[] fields = new JTextField[2];
	final JButton button = new JButton("查看");
	final JPanel panel = new JPanel();
	public ShowFloatBit(String title) {
		super(title);
		fields[0] = new JTextField(10);
		fields[1] = new JTextField(30);
		panel.add(fields[0], FlowLayout.LEFT);
		panel.add(button, FlowLayout.CENTER);
		panel.add(fields[1], FlowLayout.RIGHT);
		add(panel, BorderLayout.NORTH);
		button.addActionListener(this);
		pack();
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
	}
	public static void main(String[] args) {
		new ShowFloatBit("浮点数二进制查看器");
		float f = 3.14f;
		int k = Float.floatToIntBits(f);
		System.out.println(showIntBit(k));
	}
	public static int fromFloatToInt(float f) {
		ByteArrayInputStream bis = null;
		ByteArrayOutputStream bos = null;
		DataInputStream dis = null;
		DataOutputStream dos = null;
		int n = 0;
		try {
			bos = new ByteArrayOutputStream(4);
			dos = new DataOutputStream(bos);
			dos.writeFloat(f);
			bis = new ByteArrayInputStream(bos.toByteArray());
			dis = new DataInputStream(bis);
			n = dis.readInt();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (dos != null)
				try {
					dos.close();
				} catch (IOException e) {
				}
			if (bos != null)
				try {
					bos.close();
				} catch (IOException e) {
				}
			if (dis != null)
				try {
					dis.close();
				} catch (IOException e) {
				}
			if (bis != null)
				try {
					bis.close();
				} catch (IOException e) {
				}
		}

		return n;
	}
	public static String showIntBit(int n) {
		StringBuffer buffer = new StringBuffer();
		for (int i = 31; i >= 0; i--) {
			if ((n & (1 << i)) != 0) {	
				buffer.append("1");
			} else {			
				buffer.append("0");
			}
			if ((32 - i) % 8 == 0) {	
				buffer.append(" ");
			}
		}
		System.out.println();
		return buffer.toString();
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		float f = Float.parseFloat(fields[0].getText());
		int n = fromFloatToInt(f);
		fields[1].setText(showIntBit(n));
	}

}
</span></strong>