同步计算输入的各个数的总和与平均值

package Com.TomTest;


import java.awt.FlowLayout;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

/**
 * @author 同步计算输入的各个数的总和与平均值
 */
public class TomTest_04 extends JFrame {
    private static final long serialVersionUID = 6515574844960224544L;
    JTextField input = new JTextField(30);
    JTextField output = new JTextField(30);
    JButton close = new JButton("关闭");
    JButton reset = new JButton("清空");
    public TomTest_04() {
        setupGUI();
    }
    public void setupGUI() {
        this.setTitle("计算总和与平均值");
        this.setLayout(new FlowLayout());
        this.add(new JLabel("数据"));
        this.add(input);
        this.add(new JLabel("结果"));
        this.add(output);
        this.add(close);
        this.add(reset);
        setSize(400, 130);
        input.addKeyListener(new KeyAdapter() {
            public void keyReleased(KeyEvent e) {
                String str = input.getText();
                if (str.equals("") || str == null) {
                    output.setText("");
                } else {
                    String num[] = str.split(" ");
                    int sum = 0;
                    double avg = 0.0;
                    for (int i = 0; i < num.length; i++) {
                        sum += Integer.parseInt(num[i]);
                    }
                    avg = sum * 1.0 / num.length;
                    output.setText("Sum=" + sum + ", Avg=" + avg);
                }
            }
        });
        close.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {
                System.exit(0);
            }
        });
        reset.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {
                input.setText("");
                output.setText("");
            }
        });
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        new TomTest_04();
    }
}