JAVA上机考试常出现的十道编程题.doc

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(String 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: 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 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) Rectangle 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 Scanner(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,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：); 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(数组中最大数为：+max); System.out.println(数组中最小数为：+min); System.out.println(数组中平均数为：+ave/n); 6、填充圆package tianchongyuan;import java.applet.*;import java.awt.*;public class TianChongYuan 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 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(); else System.out.printf(*); for(j=0;j0) System.out.println(两根为x1=+(-b+Math.sqrt(m)/(2*a)+ x2=+(-b-Math.sqrt(m)/(2*a); else if(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(System.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); System.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 javax.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.event.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); jButton1.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) jButton2ActionPerformed(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) .addGroup(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.swing.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() .addComponent(jButton1) .addGap(125, 125, 125) .addComponent(jButton2) .addContainerGap(112, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(31, 31, 31) .addGroup(layout.createParallelGroup(javax.swing.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) .addComponent(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(jButton2) .addContainerGap(129, Short.MAX_VALUE) ); 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.parseDouble(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 and feel */ / /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see /javase/tutorial/uiswing/lookandfeel/plaf.html */ try for (javax.swing.UIManager.LookAndFeelInfo info : 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 (Inst