JAVA机试题库.doc

1计算 1/1+1/2+1/3+.+1/100 的值。2从标准输入(即键盘)读入10个整数存入整型数组a中，然后逆序输出这10个整数。3创建一个标题为按钮的窗框，窗框中显示有按下我字样的按钮。4在数组中查找并输出最大值和最小值。5使用选择法对数组a的数据进行升序排序，然后输出排序后的结果。6定义一个计算n！的类Fact，然后主类中创建一个对象求解4！的值。7在Applet界面中显示当前文件夹下名为pica.jpg的图像。8定义一个计算xn的类，然后用该类求103的值。9在Applet界面中显示一些由直线、矩形框、椭圆框和文字组成的图形。10求两个数的最大值。1public class Sum public static void main( String args ) double sum = 0.0 ; for ( int i = 1 ; i = 100 ; i + + ) sum += 1.0/(double) i ; System.out.println( sum=+sum ); 2. import java.io.* ; public class Reverse public static void main(String args ) int i , n =10 ; int a = new int10; for ( i = 0 ; i = 0 ; i ) System.out.print(ai+ ); System.out.println( ); 3import java.awt.*; public class abc public static void main(String args) new FrameOut(); class FrameOut extends Frame / Frame为系统定义的窗框类 Button btn; FrameOut( ) super(按钮); btn = new Button(按下我); setLayout(new FlowLayout( ); add(btn); setSize(300,200); show( ); 4 import java.io.*;public class Class1 public static void main(String args ) int i , Max , Min ; int a = 12,67,8,98,23,56,124,55,99,100 ; Max = Min = a0; for ( i = 1 ; i a.length; i + ) if ( aiMax ) Max = ai; System.out.println( Max+ +Min ); System.out.println( ); 5 public class ABC public static void main(String args ) int i , j ; int a = 12,67,8,98,23,56,124,55,99,100 ; for ( i = 0 ; i a.length-1; i + ) int k = i; for ( j = i ; j a.length ; j+ ) if ( ajak ) k = j; int temp =ai; ai = ak; ak = temp; for ( i =0 ; ia.length; i+ ) System.out.print(ai+ ); System.out.println( ); 6import java.io.*;public class Class1 public static void main( String args ) Fact N = new Fact( 4 ); System.out.println( N.fact( ) ); class Fact int n ; Fact( int nn ) n = nn; int fact( ) int i , f = 1; for ( i=1; i=n; i+ ) f = f*i; return f; 7import java.awt.*;import java.applet.Applet;public class DrawMyImage extends AppletImage myImage; / 定义一个图像类Image的对象myImagepublic void init( )myImage = getImage(getDocumentBase( ),pica.jpg);public void paint(Graphics g)g.drawImage(myImage,0,0,this);8 import java.io.*;public class Class1 public static void main( String args ) SubClass a = new SubClass( 10,3 ); System.out.println( a.exp( ); class SuperClass float x; int n; SuperClass( float xx , int nn ) x = xx ; n = nn; class SubClass extends SuperClass SubClass( float xx , int nn ) super( xx , nn ); float exp( ) float s = 1; for ( int i = 1; ib)?a:b); 1 编写一个字符界面的Java Application 程序，接受用户从键盘输入的一个正整数，然后统计并输出从1到这个正整数的累加和。2 编写一个字符界面的Java Application 程序，接受用户输入的10个整数，并输出这10个整数的最大值和最小值。3 编写一个完整的Java Applet 程序使用复数类Complex验证两个复数 1+2i 和3+4i 相加产生一个新的复数 4+6i 。 复数类Complex必须满足如下要求：(1)复数类Complex 的属性有：RealPart : int型，代表复数的实数部分ImaginPart : int型，代表复数的虚数部分(2)复数类Complex 的方法有：Complex( ) : 构造函数，将复数的实部和虚部都置0Complex( int r , int i ) : 构造函数，形参 r 为实部的初值，i为虚部的初值。Complex complexAdd(Complex a) : 将当前复数对象与形参复数对象相加，所得的结果仍是一个复数值，返回给此方法的调用者。String ToString( ) : 把当前复数对象的实部、虚部组合成 a+bi 的字符串形式，其中a 和 b分别为实部和虚部的数据。4 编写一个学生类 Student ，要求：(1) 学生类 Student 属性有：id : long型，代表学号name : String类对象，代表姓名age : int型，代表年龄sex : boolen型，代表性别（其中：true表示男，false表示女）phone : String类对象，代表联系电话(2) 学生类 Student的方法有：Student(long i , String n , int a , boolean s , long p) : 有参构造函数，形参表中的参数分别初始化学号、姓名、年龄、性别和联系电话。int getAge() ( ) : 获取年龄作为方法的返回值。boolean getSex( ) ( ) : 获取性别作为方法的返回值。long getPhone ( ) : 获取联系电话作为方法的返回值。public String toString( ) : 以 姓名：联系电话 的形式作为方法的返回值。5 编写图形界面下的Java Applet程序，接受用户输入的三个数据，输出最小的一个数。6 编写图形界面下的Java Applet程序，接受用户输入的两个数据为上、下限，然后10个一行输出上、下限之间的所有素数。7编写一个Java Applet程序响应用户的鼠标动作：以鼠标单击处为圆心，画一个随机大小，随机颜色的圆，当鼠标双击时则清空屏幕。8. 编写一个Applet响应鼠标事件程序，其功能是用户可以通过拖动鼠标在Applet中画出矩形，并在状态条显示鼠标当前的位置。9. 下图中给出某应用程序的图形界面，试写出构建该应用程序的界面程序。 10.下图中给出了某应用程序的图形界面，试写出构建该应用程序的界面程序。 1import java.io.*;public class SUMpublic static void main (String args) int i , n=-1 , sum=0 ; while ( n1) try BufferedReader br =new BufferedReader( new InputStreamReader(System.in); n = Integer.parseInt(br.readLine( ); catch ( IOException e ) ; for ( i =1 ; i=n; i+ ) sum += i; System.out.println(sum);2import java.io.* ;public class abc public static void main(String args ) int i , n = 10 , max = 0 , min = 0 , temp = 0; try BufferedReader br = new BufferedReader( new InputStreamReader(System.in); max = min = Integer.parseInt(br.readLine( ); catch ( IOException e ) ; for ( i = 2 ; i max ) max=temp; if (temp min) min=temp; catch ( IOException e ) ; System.out.println(max=+max+nmin=+min); 3import java.applet.* ; import java.awt.* ;public class abc extends Applet Complex a,b,c ; public void init( ) a = new Complex(1,2); b = new Complex(3,4); c = new Complex(); public void paint(Graphics g) c=plexAdd(b); g.drawString(第一个复数：+a.toString(),10,50); g.drawString(第二个复数：+b.toString(),10,70); g.drawString(两复数之和：+c.toString(),10,90); class Complex int RealPart ; / 复数的实部 int ImaginPart ; / 复数的虚部 Complex() RealPart = 0 ; ImaginPart = 0 ; Complex(int r , int i) RealPart = r ; ImaginPart = i ; Complex complexAdd(Complex a) Complex temp = new Complex( ); / 临时复数对象 temp.RealPart=RealPart+a.RealPart; temp.ImaginPart=ImaginPart+a.ImaginPart; return temp; public String toString( ) return ( RealPart+ + +ImaginPart+ i ); 4class Student long id; String name;int age;boolean sex;long phone;Student( long i , String n , int a , boolean s , long p ) id = i; name = n;age = a;sex = s;phone = p;int getAge() return age; boolean getSex() return sex; long getPhone() return phone; public String toString() return name+ : +phone; 5import java.applet.*;import java.awt.*;import java.awt.event.*;public class FindMinextendsAppletimplementsActionListenerLabelresult;TextFieldin1,in2,in3;Buttonbtn1,btn2;int a=0,b=0,c=0,min;public void init()result=new Label(请先输入三个待比较的整数);in1=new TextField(5);in2=new TextField(5);in3=new TextField(5);btn1=new Button(比较);btn2=new Button(关闭);add(in1);add(in2);add(in3);add(btn1);add(btn2);add(result);btn1.addActionListener(this);btn2.addActionListener(this);public void actionPerformed(ActionEvente)if(e.getSource()=btn1) a=Integer.parseInt(in1.getText(); b=Integer.parseInt(in2.getText(); c=Integer.parseInt(in3.getText(); min=a; if (bmin) min=b; if(cmin) min=c; result.setText(三数中最小值是:+min); else System.exit(0);6/输入上限与下限,输出范围内的素数import java.applet.*;import java.awt.*;import java.awt.event.*;public class Sushu extendsAppletimplementsActionListenerLabellb1,lb2,result;TextFieldin1,in2;TextArea out1;Buttonbtn1,btn2;int a=0,b=0;String s=;public void init()result=new Label(输出框);lb1=new Label(上限);lb2=new Label(下限);in1=new TextField(5);in2=new TextField(5);out1=new TextArea();out1.setEditable(false);/设为不可编辑btn1=new Button(输出素数);btn2=new Button(关闭);add(lb1);add(in1);add(lb2);add(in2);add(btn1);add(btn2);add(result);add(out1);btn1.addActionListener(this);btn2.addActionListener(this);public void actionPerformed(ActionEvente)int k=0;/设计数器if(e.getSource()=btn1)/响应按钮输出素数的动作out1.setText(n);/新行输出a=Integer.parseInt(in1.getText();b=Integer.parseInt(in2.getText();/判断是否素数,是则计数并加入输出子串sLoop:for(int i=b;ia;i+) for(int j=2;ji;j+)if(i%j=0)continueLoop;k+;if(k%10=0)/每10个数加个回车s=s+i+,+n;else s=s+i+,;result.setText(b+与+a+之间共有素数+k+个,输出如下:);out1.setText(s);else System.exit(0);/点击关闭退出程序7import java.applet.*;import java.awt.*;import java.awt.event.*;public class MouseListenerTest extends Applet int xPos=-1,yPos=-1;Color color;int radius;int mouseFlag;public void paint(Graphics g)if(mouseFlag= =1)radius = (int)(50*Math.random();color = new Color(int)(255*Math.random(),(int)(255*Math.random(),(int) (255*Math.random();g.setColor(color);g.drawString(radius is +radius,20,20);g.drawOval(xPos,yPos,radius,radius);else if(mouseFlag= =2) g.clearRect(0,0,getWidth(),getHeight(); public void init() addMouseListener(new MouseAdapter() public void mouseClicked(MouseEvent e) if(e.getClickCount() =1) mouseFlag = 1; else if (e.getClickCount() =2) mouseFlag = 2; xPos = e.getX() yPos = e.getY(); repaint(); ); 8. import java.applet.*;import java.awt.*;import java.awt.event.*;public class MouseDrawRect extends Applet implements MouseMotionListener int xstart=-1,ystart=-1; int xend,yend; TextField showPosition; public void init() showPosition = new TextField(20); add(showPosition); addMouseMotionListener(this); addMouseListener(new MouseAdapter() public void mousePressed(MouseEvent event) xstart = event.getX(); ystart = event.getY(); ); public void paint(Graphics g) if(xstart!=-1 & ystart!=-1) g.drawRect(xstart,ystart,xend-xstart,yend-ystart); showPosition.setText(the x is +xend+ the y is +yend); public void mouseDragged(MouseEvent e) xend = e.getX(); yend = e.getY(); repaint(); public void mouseMoved(MouseEvent e) 9.import javax.swing.*;import java.awt.*;class SpeakPhone extends JFrameJTextArea speak;JButton numbers = new JButton12;String numberString = 0,1,2,3,4,5,6,7,8,9,*,#;JButton enter,cancel;Font f1 = new Font(Arial,Font.BOLD,20);SpeakPhone()setSize(200,400);Container con = getContentPane();speak = new JTextArea(4,6);JPanel p1 = new JPanel();p1.setLayout(new GridLayout(2,1);Label lab =new Label(Connet Number); lab.setFont(f1);p1.add(lab);p1.add(speak);JPanel p2 = new JPanel();p2.setLayout(new GridLayout(3,4);for(int i=0;i12;i+)numbersi=new JButton(numberStringi);numbersi.setFont(f1);p2.add(numbersi);JPanel p3 = new JPanel();p3.setLayout(new GridLayout(1,2);enter = new JButton(确定);cancel = new JButton(取消);p3.add(enter);p3.add(cancel);con.add(p1,BorderLayout.NORTH);con.add(p2,BorderLayout.CENTER);con.add(p3,BorderLayout.SOUTH);setVisible(true);public static void main(String args)SpeakPhone mainFrm = new SpeakPhone();10. import java.awt.*;class MyPanel1 extends PanelCheckbox box1,box2,box3;CheckboxGroup sex;MyPanel1() sex = new CheckboxGroup(); box1 = new Checkbox(男,true,sex); box2 = new Checkbox(女,false,sex); setLayout(new GridLayout(3,1); add(new Label(性别); add(box1); add(box2);class MyPanel2 extends PanelList list;MyPanel2() list = new List(4,false); list.add(学生); list.add(教师); list.add(高工); setLayout(new GridLayout(4,1); add(new Label(职业); add(list);class MyPanel3 extends PanelCheckbox box1,box2,box3;MyPanel3() box1 = new Checkbox(读书); box2 = new Checkbox(电脑); box3 = new Checkbox(电影); setLayout(new GridLayout(4,1); add(new Label(爱好); add(box1); add(box2); add(box3);class ChoiceLike extends Frame public static void main(String args) MyPanel1 panel1 = new MyPanel1(); MyPanel2 panel2 = new MyPanel2(); MyPanel3 panel3 = new MyPanel3(); ChoiceLike mainFrame = new ChoiceLike(); mainFrame.add(panel1,BorderLayout.WEST); mainFrame.add(panel2,BorderLayout.CENTER); mainFrame.add(panel3,BorderLayout.EAST); mainFrame.setVisible(true); 1、设计一个图形用户界面的颜色合成程序，界面如下图所示。要求改变任一颜色值时，合成颜色实时变化。import java.awt.*;import java.awt.event.*;public class RGBColor extends WindowAdapter implements TextListenerFrame f;TextField tf1,tf2,tf3;Panel p2;public RGBColor()f=new Frame(合成颜色);f.setSize(500,200);Panel p1=new Panel();p2=new Panel();f.add(p1,North);f.add(p2);p1.add(new Label(Red);tf1=new TextField(255,10);p1.add(tf1);p1.add(new Label(Green);tf2=new TextField(0,10);p1.add(tf2);p1.add(new Label(Blue);tf3=new TextField(0,10);p1.add(tf3);tf1.addTextListener(this);tf2.addTextListener(this);tf3.addTextListener(this);p2.setBackground(new Color(255,0,0);f.setVisible(true);f.addWindowListener(this);public void textValueChanged(TextEvent e)int r=(new Integer(tf1.getText().intValue();int g=(new Integer(tf2.getText().intValue();int b=(new Integer(tf3.getText().intValue();p2.setBackground(new Color(r,g,b); public void windowClosing(WindowEvent e)System.exit(0);public static void main(String k)new RGBColor();2、设计一个密码验证程序，如下图所示。要求：当输入正确的密码“123456”时，验证文本域显示“you pass!”，否则显示密码错误的信息“your password error!”。import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;public class Login1 public static void main(String args) LoginFrame frame = new LoginFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.show();class LoginFrame extends JFramepublic LoginFrame()setTitle(Login);setSize(WIDTH, HEIGHT); Container contentPane = getContentPane();/建立容器面板JPanel textPanel = new JPanel();/新建输入密码标签JLabel inputPassword = new JLabel(Input password: , JLabel.CENTER);myPassword = new JPasswordField(20);textPanel.add(inputPassword);textPanel.add(myPassword);/新建密码验证标签JLabel checkedPassword = new JLabel(Checked password: , JLabel.LEFT);checkPassword = new JTextField(20);checkPassword.setEditable(false);textPanel.add(checkedPassword);textPanel.add(checkPassword);loginButton = new JButton(登录, new ImageIcon(hlpcd.gif);/注册事件监听器loginButton.addActionListener(new LoginAction();textPanel.add(loginButton);contentPane.add(textPanel);/实现事件监听器private class LoginActionimplements ActionListenerpublic void actionPerformed(ActionEvent event)/获取密码域的内容char s = myPassword.getPassword();String gets = new String(s);if(gets.equals(CHECKPASSWORD)checkPassword.setText(PASS!);elsecheckPassword.setText(WRONG PASSWORD!);public stat