j2ee考前辅导试题.doc

1.（5-12） 根据下面的要求编程实现复数类ComplexNumber。（1）复数类的属性包括实数部分和虚数部分（2）复数类的方法有加法add，减法subtract并编程验证以上的复数类。接收用户输入的复数的实部和虚部，计算复数与复数、复数与实数的加、减的操作。public class test1 public static void main(String args) ComplexNumber cNumber_1 = new ComplexNumber(3,-5); ComplexNumber cNumber_2 = new ComplexNumber(2,2); double d = 10.0; System.out.println(cNumber_1.toString() + 加 + cNumber_2.toString() + 等于 + cNumber_1.complexAdd(cNumber_2).toString(); System.out.println(cNumber_1.toString() + 加 + d + 等于 + cNumber_1.complexAdd(d).toString(); System.out.println(cNumber_1.toString() + 减 + cNumber_2.toString() + 等于 + cNumber_1.complexMinus(cNumber_2).toString(); System.out.println(cNumber_1.toString() + 减 + d + 等于 + cNumber_1.complexMinus(d).toString(); System.out.println(cNumber_1.toString() + 乘 + cNumber_2.toString() + 等于 + cNumber_1.complexMulti(cNumber_2).toString(); System.out.println(cNumber_1.toString() + 乘 + d + 等于 + cNumber_1.complexMulti(d).toString(); class ComplexNumber /域 private double m_dRealPart; private double m_dImaginPart; /构造函数 ComplexNumber() m_dRealPart = 0.0; m_dImaginPart = 0.0; ComplexNumber(double r,double i) m_dRealPart = r; m_dImaginPart = i; ComplexNumber(ComplexNumber c) m_dRealPart = c.getRealPart(); m_dImaginPart = c.getImaginaryPart(); /get,set方法 double getRealPart() return m_dRealPart; double getImaginaryPart() return m_dImaginPart; void setRealPart(double d) m_dRealPart = d; void setImaginaryPart(double d) m_dImaginPart = d; /复数运算方法 ComplexNumber complexAdd(ComplexNumber c) return new ComplexNumber( this.m_dRealPart + c.getRealPart(), this.m_dImaginPart + c.getImaginaryPart(); ComplexNumber complexAdd(double c) return new ComplexNumber( this.m_dRealPart + c, this.m_dImaginPart); ComplexNumber complexMinus(ComplexNumber c) return new ComplexNumber( this.m_dRealPart - c.getRealPart(), this.m_dImaginPart - c.getImaginaryPart(); ComplexNumber complexMinus(double c) return new ComplexNumber( this.m_dRealPart - c, this.m_dImaginPart); ComplexNumber complexMulti(ComplexNumber c) return new ComplexNumber( this.m_dRealPart * c.getRealPart() - this.m_dImaginPart * c.getImaginaryPart(), this.m_dRealPart * c.getImaginaryPart() + this.m_dImaginPart * c.getRealPart(); ComplexNumber complexMulti(double c) return new ComplexNumber( this.m_dRealPart * c, this.m_dImaginPart * c); /toString() public String toString() return ( + m_dRealPart + + + m_dImaginPart + i + ); 2. （7-24）编写Applet程序实现一个计算器，包括十个数字(09)按钮和四个运算符(加、减、乘、除)按钮，以及等号和清空两个辅助按钮，还有一个显示输入输出的文本框。import java.applet.*;import java.awt.*;import java.awt.event.*; public class test2 extends Applet implements ActionListener double firstOperant,secondOperant; int caculateStatus=0;/0:接收操作数一;1,2:接收操作数二;3:等号后 char operator; Button caculateBtn = new Button16; String btnLabel = 1,2,3,+,4,5,6,-, 7,8,9,*,0,C,=,/; TextField inOutTfd = new TextField(50); Panel btnPanel = new Panel(); public void init() btnPanel.setLayout(new GridLayout(4,4); for(int i=0; i16; i+) caculateBtni = new Button(btnLabeli); caculateBtni.addActionListener(this); btnPanel.add(caculateBtni); setLayout(new BorderLayout(); add(North, inOutTfd); add(Center, btnPanel); inOutTfd.setText(0); caculateStatus = 0; public void actionPerformed(ActionEvent ae) if(ae.getSource() instanceof Button) char ch = (Button)(ae.getSource().getLabel().charAt(0); /System.out.println(ch + , status: + caculateStatus); switch(ch) case C : inOutTfd.setText(0); firstOperant = secondOperant = 0; caculateStatus = 0; break; case = : if(caculateStatus = 0) caculateStatus = 3; else if(caculateStatus = 2) oneStepCaculate(); /System.out.println(firstOperant + , + secondOperant); caculateStatus = 3; break; case + : case - : case * : case / : if(caculateStatus = 0 | caculateStatus = 3) secondOperant = 0; caculateStatus = 1; else if(caculateStatus = 1) operator = ch; else if(caculateStatus = 2) oneStepCaculate(); secondOperant = 0; caculateStatus = 1; operator = ch; break; default : /数字键 if(caculateStatus = 0) int temp = (int)firstOperant; temp = temp*10 + ch - 0; inOutTfd.setText(Integer.toString(temp); firstOperant = temp; else if(caculateStatus = 1) secondOperant = ch - 0; inOutTfd.setText(Integer.toString(int)secondOperant); caculateStatus = 2; else if(caculateStatus = 2) int temp = (int)secondOperant; temp = temp*10 + ch - 0; inOutTfd.setText(Integer.toString(temp); secondOperant = temp; else if(caculateStatus = 3) firstOperant = ch - 0; inOutTfd.setText(Integer.toString(int)firstOperant); secondOperant = 0; caculateStatus = 0; /switch public void oneStepCaculate() switch(operator) case + : firstOperant += secondOperant; break; case - : firstOperant -= secondOperant; break; case *: firstOperant *= secondOperant; break; case /: firstOperant /= secondOperant; break; inOutTfd.setText(Double.toString(firstOperant); 3. 编写一个java程序，通过键盘输入10个整数，每个数据一行，将这些数据按升序排序后从系统的标准输出设备输出。import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.Arrays;public class Test3public static void main(String args) throws IOExceptionint my_array=new int10;String s;System.out.println(输入10个整数,一行一个);BufferedReader br=new BufferedReader(new InputStreamReader(System.in);for(int i=0;imy_array.length;i+)s=br.readLine();my_arrayi=Integer.parseInt(s);Arrays.sort(my_array);System.out.println(排序后的数据为：n);for(int i=0;imy_array.length;i+)System.out.print(my_arrayi+t);4. （6-11）编写一个java程序，通过键盘输入10个整数，每个数据一行，求出这个数组的最大值、最小值、平均值和所有元素的和。import java.applet.*; import java.awt.*;import java.awt.event.*;public class Test4 extends Applet implements ActionListener final int ARRAY_LENGTH = 10; /* final String labelPrompt = 最大值：,最小值：, 总和：,平均值：; */ int myArray = new intARRAY_LENGTH; int count=0, max=0, min=0, sum=0; double avg=0.0; TextField inputTfd; int strNo; Label inputLbl; String result=; /* Label maxLabel = new Label(labelPrompt0 + ); Label minLabel = new Label(labelPrompt1 + ); Label sumLabel = new Label(labelPrompt2 + ); Label avgLabel = new Label(labelPrompt3 + ); */ public void init() inputTfd = new TextField(10); strNo=1; inputLbl = new Label(请输入第+strNo+个数据并回车：); add(inputLbl); add(inputTfd); /* add(maxLabel); add(minLabel); add(sumLabel); add(avgLabel); */ inputTfd.addActionListener(this); public void actionPerformed(ActionEvent ae) if(strNoARRAY_LENGTH) strNo+; inputLbl.setText(请输入第+strNo+个数据并回车：); myArraystrNo-2 = Integer.parseInt(inputTfd.getText(); inputTfd.setText(); else myArrayARRAY_LENGTH-1 = Integer.parseInt(inputTfd.getText(); inputTfd.setEditable(false); inputLbl.setText(finished the input); calcute(); repaint(); public void calcute() min=max=sum=myArray0; for(int i=1;imyArray.length;i+) max=Math.max(max,myArrayi); min=Math.min(min,myArrayi); sum+=myArrayi; result=最大值为：+max+n + 最小值为：+min+n + 总和为：+sum+n + 平均值为：+(sum/myArray.length)+n; public void paint(Graphics g) g.drawString(result, 10, 150); 5（6-17） 编写java applet小程序，通过文本框接受用户输入的字符串值, 按钮用于判断其是否为回文,并给出相应的判断结果说明。import java.applet.Applet;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.*;public class Test5 extends Applet implements ActionListener /* public static void main(String args) try System.out.println(请输入一个字符串：); BufferedReader br = new BufferedReader( new InputStreamReader(System.in); String str = br.readLine(); if(isReversable(str) System.out.println(这个字符串是回文。n); else System.out.println(这个字符串不是回文。n); catch(IOException ioe) System.out.println(ioe.toString(); */TextField tf=new TextField(100);Label lb_prompt=new Label(请输入字符串，用于判断是否是回文：);Label lb_result=new Label( + ); public void init() add(lb_prompt); add(tf); add(lb_result); tf.addActionListener(this); public static boolean isReversable(String s) for(int i=0,j=s.length()-1; ij; i+,j-) if(s.charAt(i) != s.charAt(j) return false; return true; public void actionPerformed(ActionEvent e) / TODO 自动生成方法存根String str=tf.getText(); if(isReversable(str) / System.out.println(这个字符串是回文。n); lb_result.setText(字符串+str+ 是回文。n); else lb_result.setText(字符串+str+ 不是回文。n);6.（6-19）编写java application程序，接受命令行参数指定的整数范围，输出这个范围之内的所有完全数和所有素数（）public class Test7 public static void main(String args) if(args.length ceiling) temp = floor; floor = ceiling; ceiling = temp; System.out.println(floor +到+ceiling+范围内的完全数有：); for(int i=floor; iceiling; i+) if(isWanQuanShu(i) System.out.print( i + t ); count+; if( count%6 = 0) System.out.println(); count=0; System.out.println(n+floor +到+ceiling+范围内的素数有：); for(int i=floor; iceiling; i+) if(isSuShu(i) System.out.print( i + t ); count+; if( count%6 = 0) System.out.println(); catch(NumberFormatException nfe) System.out.println(nfe.toString(); System.out.println(命令行参数应为整型，例如 + n java ch6_e6_19 1 1000); static boolean isSuShu(int n) boolean flag=true; if(n=1) return false; if(n=2) return true; for(int k=2;kn;k+) if(n%k=0) flag=false;break; /else return true; return flag; static boolean isWanQuanShu(int n) int y=0; for(int j=1; jn; j+) if( n%j = 0) y += j; if( y = n ) return true; else return false; 7（6-14）编写applet程序创建200电话卡的对象。程序自动生成200电话卡的卡号，由用户输入密码和金额（密码用*字符屏蔽），接入号码和附加费固定为200和0.1。每创建一个200电话卡对象后，就输出它的有关信息。程序可以创建任意个数的对象，并把它们按照金额升序排列在一个向量Vector对象中，并能根据用户输入的卡号进行查找，找到输出对应电话卡的金额，否则，输出相应的提示信息。import java.applet.*; import java.awt.*;import java.awt.event.*;import java.util.*;public class Test5 extends Applet implements ActionListener final long CONNECT_NUMBER = 200; final double CONNECT_FEE = 0.5; Label cardNumberLbl = new Label(); Label balanceLbl = new Label(余额：); Label passwordLbl = new Label(密码); TextField balanceTfd = new TextField(8); TextField passwordTfd = new TextField(8); TextField searchIdxTfd = new TextField(8); Button createCard = new Button(创建); Button searchCard = new Button(查找); Label searchResult = new Label(查找结果： + + ); Vector phoneCardVector = new Vector(); public void init() balanceTfd.setText(); passwordTfd.setText(); searchIdxTfd.setText(); cardNumberLbl.setText(电话卡号： + PhoneCard200.cardNumber200); add(cardNumberLbl); add(balanceLbl); add(balanceTfd); add(passwordLbl); add(passwordTfd); add(createCard); add(searchIdxTfd); add(searchCard); add(searchResult); passwordTfd.setEchoChar(*); searchResult.setAlignment(Label.LEFT); createCard.addActionListener(this); searchCard.addActionListener(this); public void actionPerformed(ActionEvent ae) PhoneCard200 phoneCard; if(ae.getSource() = createCard) /创建电话卡 phoneCard = new PhoneCard200( Double.parseDouble(balanceTfd.getText(), passwordTfd.getText(), CONNECT_NUMBER, CONNECT_FEE); /按升序插入 boolean added = false; for(int i=0; iphoneCardVector.size(); i+) if(phoneCard.getBalance() (PhoneCard200)(phoneCardVector.get(i).getBalance() phoneCardVector.insertElementAt(phoneCard,i); added = true; break; /若是第一张卡，或者是余额最大的卡，则加在向量的最后 if(!added) phoneCardVector.add(phoneCard); cardNumbe