JAVA上机考试常出现的十道编程题

1、常用十题1、九九乘法表：public class chengfa public static void main(String args) int i,j;System.out.println(9*9 乘法表如下：);for(i=1;i=9;i+)for(j=1;j=i;j+)System.out.print(+i+*+j+=+i*j);System.out.print( );System.out.println( );2、成绩判断import java.util.Scanner;public class chengjipanduan public static void main(Strin

2、g args) int grade;System.out.println( 输入你的成绩：);Scanner s=new Scanner(System.in);grade=s.nextInt();switch(grade/10)case 10:case 9:System.out.println( 你的成绩为优);break;case 8:System.out.println( 你的成绩为良);break;case 7:System.out.println( 你的成绩为中);break;case 6:System.out.println( 你的成绩为及格);break;case 5:case 4

3、:case 3:case 2:case 1:case 0:System.out.println( 你的成绩为差);break;3、矩形类public class Rectangle double width=1.0;double height=1.0;public Rectangle(double width,double height)this.width=width;this.height=height;public void setwidth(double width)this.width=width;public double getwidth(double widtht)return

4、 width;public void setheight(double height)this.height=height;public double getheight(double height)return height;public double getArea()return width*height;public double getperimeter()return 2*(width+height);import tixing06.Rectangle;public class TestRectangle public static void main(String args)Re

5、ctangle r=new Rectangle(4,40);System.out.println( 矩形面积为 +r.getArea()+ 周长为 +r.getperimeter();4、两数对换package tixing;import java.util.Scanner;public class TiXing02 public static void main(String args) int a,b;System.out.println( 输入两个数a 和 b:);Scanner s=new Scanner(System.in);a=s.nextInt();Scanner k=new S

6、canner(System.in);b=k.nextInt();System.out.println( 两个数为 :a=+a+b=+b);exchange(a,b);public static void exchange(int a,int b)int t;t=a;a=b;b=t;System.out.println( 交换后两个数为:a=+a + b=+b);5、数组import java.util.Scanner;import java.util.Random;public class shuzu public static void main(String args) int n,i,j

7、,k;double ave=0;System.out.println( 输入数组长度：);Scanner s=new Scanner(System.in);n=s.nextInt();int a=new intn;System.out.println( 输入的原数组为：);for(i=0;in;i+)ai=(int)(Math.random()*10+1);System.out.printf(%4d,ai);for(i=0;in;i+) for(j=i+1;jai)k=ai;ai=aj;aj=k;System.out.println();System.out.println(输入的数组排序为：

8、);for(i=0;in;i+)System.out.printf(%4d,ai);int max,min;max=a0;min=a0;for(i=0;imax)max=ai;if(aimin)min=ai;ave+=ai;System.out.println();System.out.println(System.out.println(System.out.println(数组中最大数为：数组中最小数为：数组中平均数为：+max);+min);+ave/n);6、填充圆package tianchongyuan;import java.applet.*;import java.awt.*;

9、public class TianChongY uan extends Appletpublic void paint(Graphics g)g.drawOval(0,0,100,100);g.drawRoundRect(110,10,90,60,50,30);g.setColor(Color.blue);g.fillArc(0,0,100,100,0,360);g.setColor(Color.red);g.fillArc(110,10,90,60,0,360);7、星形三角形package sanjiaoxing;import java.util.Scanner;public class

10、SanJiaoXing public static void main(String args) int i,j,n;System.out.println( 输入层数n:);Scanner s=new Scanner(System.in);n=s.nextInt();for(i=1;i=n;i+)for(j=0;jn-i;j+)System.out.printf( );if(i%2!=0)for(j=0;j2*i-1;j+)System.out.printf(*);System.out.println();elseSystem.out.printf(*);for(j=0;j0)System.o

11、ut.println(两根为x1=+(-b+Math.sqrt(m)/(2*a)+x2=+(-b-Math.sqrt(m)/(2*a);elseif(m=0)System.out.println( 方程有同根为:x1=x2=+(-b/(2*a);if(m0)System.out.println( 方程无根 );9、平方根import java.util.Scanner;public class pingfanggeng public static void main(String args) int a,b,c,m;double x1,x2;Scanner sc=new Scanner(Sys

12、tem.in);System.out.println( 请输入一元二次方程的二次项系数：a=sc.nextInt();Scanner sr=new Scanner(System.in);System.out.println( 请输入一元二次方程的一次项系数：b=sr.nextInt();Scanner st=new Scanner(System.in);System.out.println( 请输入一元二次方程的常数项系数：);););c=st.nextInt();m=b*b-4*a*c;x1=(-b+Math.sqrt(m)/(2*a);x2=(-b-Math.sqrt(m)/(2*a);S

13、ystem.out.println( 一元二次方程的根为： +x1+x2);10、简单计算机窗口（此题为JFrame 窗体）import javax.swing.JOptionPane;public class NewJFrame extends javax.swing.JFrame public NewJFrame() initComponents();private void initComponents() jLabel1 = new javax.swing.JLabel();jLabel2 = new javax.swing.JLabel();jTextField1 = new jav

14、ax.swing.JTextField();jTextField2 = new javax.swing.JTextField();jButton1 = new javax.swing.JButton();jButton2 = new javax.swing.JButton();setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);jLabel1.setText( 第一个数 );jLabel2.setText( 第二个数 );jTextField1.addActionListener(new java.awt.ev

15、ent.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt)jTextField1ActionPerformed(evt););jTextField2.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt)jTextField2ActionPerformed(evt););jButton1.setText( 计算 );jBut

16、ton1.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt)jButton1ActionPerformed(evt););jButton2.setText( 取消 );jButton2.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt)jButto

17、n2ActionPerformed(evt););javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane();getContentPane().setLayout(layout);layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(49, 49, 49).addGrou

18、p(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(jLabel2).addComponent(jLabel1).addGap(82, 82, 82).addGroup(layout.createParallelGroup(javax.swin

19、g.GroupLayout.Alignment.LEADING, false).addComponent(jTextField1,javax.swing.GroupLayout.PREFERRED_SIZE, 75,javax.swing.GroupLayout.PREFERRED_SIZE).addComponent(jTextField2,javax.swing.GroupLayout.PREFERRED_SIZE, 75,javax.swing.GroupLayout.PREFERRED_SIZE).addGroup(layout.createSequentialGroup().addC

20、omponent(jButton1).addGap(125, 125, 125).addComponent(jButton2).addContainerGap(112, Short.MAX_V ALUE);layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(31, 31, 31).addGroup(layout.createParallelGroup(javax.sw

21、ing.GroupLayout.Alignment.BASELINE).addComponent(jLabel1).addComponent(jTextField1,javax.swing.GroupLayout.PREFERRED_SIZE,javax.swing.GroupLayout.DEFAULT_SIZE,javax.swing.GroupLayout.PREFERRED_SIZE).addGap(35, 35, 35).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).ad

22、dComponent(jLabel2).addComponent(jTextField2,javax.swing.GroupLayout.PREFERRED_SIZE,javax.swing.GroupLayout.DEFAULT_SIZE,javax.swing.GroupLayout.PREFERRED_SIZE).addGap(40, 40, 40).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(jButton1).addComponent(jBut

23、ton2).addContainerGap(129, Short.MAX_V ALUE);pack();private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) double qiuhe;qiuhe = Double.parseDo

24、uble(jTextField1.getText() +Double.parseDouble(jTextField2.getText();JOptionPane.showMessageDialog(null,qiuhe);private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) dispose();System.exit(0);/ TODO add your handling code here:public static void main(String args) /* Set the Nimbus look

25、and feel */* If Nimbus (introduced in Java SE 6) is not available, stay with the default lookand feel.* For details seehttp:/ for(javax.swing.UIManager.LookAndFeelInfoinfo:javax.swing.UIManager.getInstalledLookAndFeels() if (Nimbus.equals(info.getName() javax.swing.UIManager.setLookAndFeel(info.getClassName();break; catch (ClassNotFoundException ex) java.util.logging.Logger.getLogger(NewJFrame.class.getName().log(java.util.logging.Level.SEVERE, null, ex); catch (InstantiationExcep