java上机实验报告.doc

Java与面向对象程序设计上机报告l 第一题：修改第五章中StyleOptions程序，允许用户指定字体大小，用单行文本框得到字体大小。提示：参考例题5.225.23源程序：import javax.swing.*;import java.awt.*;import java.awt.event.*;public class StyleOptionsPanel extends JPanel private JLabel saying,inputLabel,resultLabel; private JCheckBox bold, italic; private JTextField num; public StyleOptionsPanel() String numStr; inputLabel=new JLabel(Font Size:); num=new JTextField(8); num.addActionListener(new TempListener(); saying = new JLabel (Say it with style!); saying.setFont (new Font (Helvetica, Font.PLAIN, 36); bold = new JCheckBox (Bold); bold.setBackground (Color.green); italic = new JCheckBox (Italic); italic.setBackground (Color.green); StyleListener listener = new StyleListener(); bold.addItemListener (listener); italic.addItemListener (listener); add (saying); add (bold); add (italic); add(inputLabel); add(num); setBackground (Color.yellow); setPreferredSize (new Dimension(300, 100); private class TempListener implements ActionListener public void actionPerformed (ActionEvent event) int number=36; String text = num.getText(); number= Integer.parseInt (text); saying.setFont (new Font (Helvetica, Font.PLAIN, number); private class StyleListener implements ItemListener public void itemStateChanged (ItemEvent event) int style = Font.PLAIN; if (bold.isSelected() style = Font.BOLD; if (italic.isSelected() style += Font.ITALIC;saying.setFont (new Font (Helvetica, style, 36); import javax.swing.JFrame;public class StyleOptions public static void main (String args) JFrame frame = new JFrame (Style Options); frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); StyleOptionsPanel panel = new StyleOptionsPanel(); frame.getContentPane().add (panel); frame.pack(); frame.setVisible(true); 运行情况及结果截图：完成情况说明：l 第二题：PP6.1 修改第四章的Account类，使其也允许仅使用账户名和账号建立账户，并假设初始余额为0。修改Transactions类的main方法实现这个新功能。提示：参考例4.34.4源程序：import java.text.NumberFormat; class Account private final double RATE = 0.035; / interest rate of 3.5% private long acctNumber; private double balance; private String name; public Account (String owner, long account, double initial) name = owner; acctNumber = account; balance = initial; public Account (String owner, long account) name = owner; acctNumber = account; balance = 0.00; public double deposit (double amount) balance = balance + amount; return balance; public double withdraw (double amount, double fee) balance = balance - amount - fee; return balance; public double addInterest () balance += (balance * RATE); return balance; public double getBalance () return balance; public String toString () NumberFormat fmt = NumberFormat.getCurrencyInstance(); return (acctNumber + t + name + t + fmt.format(balance); public class Transactions public static void main (String args) Account acct1 = new Account (Ted Murphy, 72354, 102.56); Account acct2 = new Account (Jane Smith, 69713, 40.00); Account acct3 = new Account (Edward Demsey, 93757, 759.32); Account acct4 = new Account (jhgu, 67856); acct1.deposit (25.85); double smithBalance = acct2.deposit (500.00); System.out.println (Smith balance after deposit: + smithBalance); System.out.println (Smith balance after withdrawal: + acct2.withdraw (430.75, 1.50); acct1.addInterest(); acct2.addInterest(); acct3.addInterest(); acct4.addInterest(); System.out.println (); System.out.println (acct1); System.out.println (acct2); System.out.println (acct3); System.out.pri