2012江西财经大学java笔试A.doc

第一类题目：1：public class exer public static void main(String args) int a=1+(int)(Math.random()*3000);boolean isprime=true;for(int k=2;k=a/2;k+)if(a%k=0) isprime=false;break;if(isprime) System.out.println(a+是素数);else System.out.println(a+不是素数);（2）public class exer public static void main(String args) for(int i=10000;i=100000;i=i+10000)double sum=1;double e=1;for(int k=1;k=i;k+)sum*=k;e+=1.0/sum;System.out.println(当i的值为+i+时e的值为+e);（4）public class exer public static void main(String args) int a=1,4,7,9,12;for(int i=0;i=2;i+)int temp;temp=ai;ai=a4-i;a4-i=temp;for(int i=0;i=4;i+)System.out.print(ai+ );第二类题目1：public class exer21 public static void main(String args) Triangle t=new Triangle(1,1.5,1);t.setcolor(yellow);t.setfilled(true);System.out.println(t.toString()+n周长为+t.getPerimeter()+n面积为+t.getArea()+n颜色为+t.getcolor()+n是否填充 ：+t.getfilled(); abstract class GeometricObjectprotected String color;protected boolean filled;abstract public double getArea();abstract public double getPerimeter();class Triangle extends GeometricObjectprivate double side1;private double side2;private double side3;public Triangle()side1=1;side2=1;side3=1;public Triangle(double side1,double side2,double side3)this.side1=side1;this.side2=side2;this.side3=side3;public void setside1(double side1)this.side1=side1;public double getside1()return side1;public void setside2(double side2)this.side2=side2;public double getside2()return side2;public void setside3(double side3)this.side3=side3;public double getside3()return side3;public void setcolor(String color)this.color=color;public String getcolor()return color;public void setfilled(boolean filled)this.filled=filled;public boolean getfilled()return filled;public double getArea() double s=(side1+side2+side3)/2;double area=Math.sqrt(s*(s-side1)*(s-side2)*(s-side3);return area;Overridepublic double getPerimeter() return side1+side2+side3;public String toString()return 三角形的三条边为:+side1+、 +side2+、 +side3;2.3public class exer23 public static void main(String args) System.out.println(- 储存账户 -);savingaccount debitCardAccount = new savingaccount(CHK1, 100, 0.01);/ 初始余额有100元，调用并打印取90元和取120元的结果。System.out.println(取90元的结果： + debitCardAccount.getmoney(90);/ 重新存入90元debitCardAccount.storemoney(90);System.out.println(取120元的结果： + debitCardAccount.getmoney(120);/ 创建一个可以透支的信用卡账户。System.out.println(- 支票账户 -);checkingaccount crebitCardAccount = new checkingaccount(CHK2, 100, 0.02, 50);/ 初始余额有100元，并且透支限度为50元，调用并打印取90元、取120元和取160元的结果。System.out.println(取90元的结果： + crebitCardAccount.getmoney(90);/ 重新存入90元crebitCardAccount.storemoney(90);System.out.println(取120元的结果： + crebitCardAccount.getmoney(120);/ 重新存入120元crebitCardAccount.storemoney(120);System.out.println(取160元的结果： + crebitCardAccount.getmoney(160);class Accountprivate String accountNumber;protected double overage;/余额private double annualInterestRate;/年利息public Account(String accountNumber, double overage,double annualInterestRate)this.accountNumber=accountNumber;this.overage=overage;this.annualInterestRate=annualInterestRate;public void storemoney(double money)this.overage+=money;public boolean getmoney(double money)if(this.overage= 0 ? overdraftLimit : 0;public checkingaccount(String accountNumber, double overage,double annualInterestRate) super(accountNumber, overage, annualInterestRate);public boolean getmoney(double money) / 如果账户余额 + 透支限度的总金额仍不足，则不能取款if (this.overage + this.overdraftLimit money)return false;/ 否则从账户余额中扣除相应的金额this.overage -= money;return true;第三类：1：import java.awt.*;import java.util.Calendar;import java.util.GregorianCalendar;import javax.swing.JButton;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JFrame;public class clock extends JFrameprivate int hour; private int minute; private int second;private JLabel l1=new JLabel(小时);private JLabel l2=new JLabel(分);private JLabel l3=new JLabel(秒);private JTextField t1=new JTextField( );private JTextField t2=new JTextField( );private JTextField t3=new JTextField( );private JButton b1=new JButton(设置); public clock() JPanel p1=new JPanel(); p1.setLayout(new FlowLayout(FlowLayout.LEFT,20,20); p1.add(l1); p1.add(t1); p1.add(l2); p1.add(t2); p1.add(l3); p1.add(t3); p1.add(b1); final StillClock c1=new StillClock(7,5,11); setLayout(new BorderLayout(); add(c1,BorderLayout.CENTER); add(p1,BorderLayout.SOUTH); b1.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) hour=Integer.parseInt(t1.getText().toString();minute=Integer.parseInt(t2.getText().toString();second=Integer.parseInt(t3.getText().toString();c1.sethour(hour);c1.sethour(minute);c1.sethour(second);repaint(); ); public static void main(String args) clock frame = new clock(); frame.setTitle(text); frame.setSize(300, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setVisible(true); class StillClock extends JPanel private int hour;private int second;private int minute;public StillClock(int hour, int minute, int second) this.hour = hour; this.minute = minute; this.second = second; public void sethour(int honr) this.hour=hour; public void setminute(int minute) this.minute=minute; public void setsecond(int second) this.second=second; protected void paintComponent(Graphics g) super.paintComponent(g); int clockRadius = (int)(double)Math.min(getWidth(), getHeight() * 0.8 * 0.5); int xCenter = getWidth() / 2; int yCenter = getHeight() / 2; g.setColor(Color.black); g.drawOval(xCenter - clockRadius, yCenter - clockRadius, 2 * clockRadius, 2 * clockRadius); g.drawString(12, xCenter - 5, (yCenter - clockRadius) + 12); g.drawString(9, (xCenter - clockRadius) + 3, yCenter + 5); g.drawString(3, (xCenter + clockRadius) - 10, yCenter + 3); g.drawString(6, xCenter - 3, (yCenter + clockRadius) - 3); int sLength = (int)(double)clockRadius * 0.8); int xSecond = (int)(double)xCenter + (double)sLength * Math.sin(double)second * 2*Math.PI/60 ); int ySecond = (int)(double)yCenter - (double)sLength * Math.cos(double)second * 2*Math.PI/60); g.setColor(Color.red); g.drawLine(xCenter, yCenter, xSe