mainframe.java~5~

实用的java习题,初学者可用

package ratefee;

import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2007</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class MainFrame
    extends JFrame {
  JPanel contentPane;
  JLabel lblBasic = new JLabel();
  JLabel lblRate = new JLabel();
  JLabel lblYear = new JLabel();
  JTextField txtBasic = new JTextField();
  JTextField txtRate = new JTextField();
  JTextField txtYear = new JTextField();
  JButton btnCal = new JButton();
  JLabel lblAll = new JLabel();
  JScrollPane jScrollPane1 = new JScrollPane();
  JTextArea txaAll = new JTextArea();
  public MainFrame() {
    try {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch (Exception exception) {
      exception.printStackTrace();
    }
  }

  /**
   * Component initialization.
   *
   * @throws java.lang.Exception
   */
  private void jbInit() throws Exception {
    contentPane = (JPanel) getContentPane();
    contentPane.setLayout(null);
    setSize(new Dimension(451, 460));
    setTitle("计算利息");
    lblBasic.setText("本金");
    lblBasic.setBounds(new Rectangle(46, 44, 46, 20));
    lblRate.setText("利率");
    lblRate.setBounds(new Rectangle(46, 102, 46, 20));
    lblYear.setText("存款年数");
    lblYear.setBounds(new Rectangle(46, 156, 59, 20));
    txtBasic.setText("");
    txtBasic.setHorizontalAlignment(SwingConstants.RIGHT);
    txtBasic.setBounds(new Rectangle(127, 44, 114, 25));
    txtRate.setText("");
    txtRate.setHorizontalAlignment(SwingConstants.RIGHT);
    txtRate.setBounds(new Rectangle(125, 103, 115, 25));
    txtYear.setText("");
    txtYear.setHorizontalAlignment(SwingConstants.RIGHT);
    txtYear.setBounds(new Rectangle(124, 154, 114, 25));
    btnCal.setBounds(new Rectangle(276, 42, 85, 29));
    btnCal.setText("计算");
    btnCal.addActionListener(new MainFrame_btnCal_actionAdapter(this));
    lblAll.setText("每年年终金额");
    lblAll.setBounds(new Rectangle(49, 216, 88, 20));
    jScrollPane1.setBounds(new Rectangle(47, 252, 353, 181));
    txaAll.setText("");
    contentPane.add(lblRate);
    contentPane.add(lblYear);
    contentPane.add(lblBasic);
    contentPane.add(txtRate);
    contentPane.add(txtBasic);
    contentPane.add(txtYear);
    contentPane.add(btnCal);
    contentPane.add(lblAll);
    contentPane.add(jScrollPane1);
    jScrollPane1.getViewport().add(txaAll);
  }

  public void btnCal_actionPerformed(ActionEvent e) {
    //输入判断
    String basic = txtBasic.getText().trim();
    String rate = txtRate.getText().trim();
    String year = txtYear.getText().trim();
    //清空文本域内容
    txaAll.setText("");
    //计算
    float b = Float.parseFloat(basic);
    float r = Float.parseFloat(rate);
    int y = Integer.parseInt(year);
    txaAll.append("年份\t年终金额\n");
    for(int i = 1; i <= y; i++)
    {
      float all = b * (1 + r);
      txaAll.append(i + "\tRMB" + all + "\n");
      b = b * (1 + r);
    }
  }
}

class MainFrame_btnCal_actionAdapter
    implements ActionListener {
  private MainFrame adaptee;
  MainFrame_btnCal_actionAdapter(MainFrame adaptee) {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e) {

    adaptee.btnCal_actionPerformed(e);
  }
}