模拟系统时钟

package day141020;

import java.util.Scanner;

public class CircleRun {
	private static final double FP = 8.5;
	private static final double CP = 12;
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("请输入游泳池的半径: ");
		if(sc.hasNextDouble()) {
			double r = sc.nextDouble();
			Circle small = new Circle(r);
			Circle big = new Circle(r + 3);
			System.out.printf("围墙的造价为: ￥%.1f元\n", FP * big.getCircumference());
			System.out.printf("过道的造价为: ￥%.1f元\n", CP * (big.getArea() - small.getArea()));
		}
		else {
			System.out.println("输入错误!!!");
		}
		sc.close();
	}
}

package day141023;

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;

public class ClockRun {
	public static void main(String[] args) throws Exception {

		final Clock sj = new Clock();

		JFrame w = new JFrame();
		w.setVisible(true);
		w.setSize(800, 600);
		w.setTitle("时钟");
		w.setResizable(false);
		w.setLocationRelativeTo(null);
		w.setLayout(null);
		w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		JLabel lbl1 = new JLabel("时间");
		Font font = new Font("楷体", 1, 56);
		lbl1.setFont(font);
		lbl1.setBounds(50, 50, 700, 120);
		w.add(lbl1);

		final JLabel lbl2 = new JLabel("");
		Font font1 = new Font("楷体", 1, 56);
		lbl2.setFont(font1);
		lbl2.setBounds(200, 50, 700, 120);
		lbl2.setText(sj.toString());
		w.add(lbl2);
		// while (true) {
		// System.out.println(sj.toString());
		// sj.go();
		// Thread.sleep(1000);
		// }

		Timer timer = new Timer(1000, new ActionListener() {
			// delay延迟时间 listener监听器（时间到了干什么）
			@Override
			public void actionPerformed(ActionEvent e) {
				sj.go();
				lbl2.setText(sj.toString());
			}
		});
		timer.start();
	}
}