変数を使用したい場所がスコープ外

前提・実現したいこと

曲などのテンポを測るというものを作ろうとしています。
スペースキーを押すとその時の時刻を変数に代入して、
(後に測った時刻)-(先に測った時刻)でスペースキーを二回押す間の時間を求めたいと思っています。

発生している問題・エラーメッセージ

ソース内で使用しているlong型の変数TimeBのスコープ外でTimeBを使用しようとしている。
調べてはみたのですがどのようにTimeBを受け渡すべきかが分かりませんでした。

Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problem: 
	TimeB を変数に解決できません

	at main.BPMWindow.keyPressed(BPMer.java:52)
	at java.awt.Component.processKeyEvent(Component.java:6497)
	at java.awt.Component.processEvent(Component.java:6316)
	at java.awt.Container.processEvent(Container.java:2239)
	at java.awt.Window.processEvent(Window.java:2025)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2297)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:835)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1103)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:974)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:800)
	at java.awt.Component.dispatchEventImpl(Component.java:4760)
	at java.awt.Container.dispatchEventImpl(Container.java:2297)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
	at java.awt.EventQueue$4.run(EventQueue.java:733)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

該当のソースコード

Java
1package main;
2
3import java.awt.Container;
4import java.awt.FlowLayout;
5import java.awt.event.KeyEvent;
6import java.awt.event.KeyListener;
7
8import javax.swing.JFrame;
9import javax.swing.JLabel;
10
11public class BPMer
12{
13	public static void main(String[] args)
14	{
15		BPMWindow bw = new BPMWindow("BPM", 300, 100);
16		bw.setVisible(true);
17		bw.setLayout(new FlowLayout());
18
19		Container c = bw.getContentPane();
20
21		JLabel l = new JLabel("Keep This Window Active to Measure BPM");
22
23		c.add(l);
24	}
25}
26
27class BPMWindow extends JFrame implements KeyListener
28{
29	int count = 0;
30	public BPMWindow(String title, int width, int height)
31	{
32		super(title);
33		setDefaultCloseOperation(EXIT_ON_CLOSE);
34		setSize(width, height);
35		setLocationRelativeTo(null);
36		setResizable(false);
37		addKeyListener(this);
38	}
39
40	@Override
41	public void keyTyped(KeyEvent e) {}
42
43	@Override
44	public void keyPressed(KeyEvent e)
45	{
46		long TimeA = System.nanoTime();
47
48		if(e.getKeyCode() == KeyEvent.VK_SPACE )
49		{
50			++count; System.out.print(count+" ");
51
52			System.out.println(TimeB - TimeA);
53		}
54
55		long TimeB = TimeA;
56	}
57
58	@Override
59	public void keyReleased(KeyEvent e){}
60}