绘制图表import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.Random;import javax.swing.JFrame;public class ChartPrint extends JFrame{//绘制柱形统计图private Random ran;public ChartPrint(){super();ran = new Random();setTitle("绘制得分柱形图");setBounds(100, 100, 400, 271);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}@Overridepublic void paint(Graphics g){int Width = getWidth();int Height = getHeight();int leftMargin = 20;//柱形图左边界int topMargin = 50;//柱形图上边界Graphics2D g2 = (Graphics2D) g;int ruler = Height-topMargin-5;int rulerStep = ruler/10;//将当前的高度评分为10个单位g2.setColor(Color.WHITE);//绘制白色背景g2.fillRect(0, 0, Width, Height);//绘制矩形图g2.setColor(Color.LIGHT_GRAY);for(int i=0;i<=10;i++){//绘制灰色横线和百分比g2.drawString((100-10*i)+"%", 5, topMargin+rulerStep*i);//写下百分比g2.drawLine(5, topMargin+rulerStep*i, Width, topMargin+rulerStep*i);//绘制灰色横线}g2.setColor(Color.cyan);for(int i=0;i<4;i++){//绘制柱形图int value = ran.nextInt(Height-topMargin-10)+10;//随机产生柱形的百分比int step = (i+1)*40;//设置每隔柱形图的水平间隔为40//绘制矩形
//            g2.drawRoundRect(leftMargin+step*2, Height-value, 40, value, 40, 10);g2.fillRoundRect(leftMargin+step*2, Height-value, 40, value, 40, 10);//列出产品的编号g2.drawString("练习次数"+(i+1), leftMargin+step*2, Height-value-5);}}public static void main(String[] args) {ChartPrint demo = new ChartPrint();demo.setVisible(true);}
}登录界面
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Login {    private JFrame frame = new JFrame("四则运算");    private Container c = frame.getContentPane();    private JTextField username = new JTextField();    private JPasswordField password = new JPasswordField();    private JButton ok = new JButton("确定");private JButton cancel = new JButton("取消");    public Login(){       frame.setSize(300,200);        c.setLayout(new BorderLayout());    initFrame();    frame.setVisible(true);}    private void initFrame() {                //顶部ok.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent arg0) {new chuti();}});JPanel titlePanel = new JPanel();    titlePanel.setLayout(new FlowLayout());    titlePanel.add(new JLabel("学生登录"));    c.add(titlePanel,"North");            //中部表单        JPanel fieldPanel = new JPanel();        fieldPanel.setLayout(null);        JLabel l1 = new JLabel("学   号:");        l1.setBounds(50, 20, 50, 20);    JLabel l2 = new JLabel("密    码:");        l2.setBounds(50, 60, 50, 20);    fieldPanel.add(l1);        fieldPanel.add(l2);        username.setBounds(110,20,120,20);    password.setBounds(110,60,120,20);    fieldPanel.add(username);    fieldPanel.add(password);    c.add(fieldPanel,"Center");                //底部按钮        JPanel buttonPanel = new JPanel();    buttonPanel.setLayout(new FlowLayout());    buttonPanel.add(ok);    buttonPanel.add(cancel);        c.add(buttonPanel,"South");}    public static void main(String[] args){       new Login(); }    }随机出题
import java.util.Random;public class chuti {int a,b,c,d;int an[]=new int [5];String bn[]=new String [5];Random cn =new Random();chuti(){int i=0;do{    a=cn.nextInt(100);b=cn.nextInt(100);d=cn.nextInt(100)%4+1;switch(d){case 1:an[i]=a+b;bn[i]=String.valueOf(a)+"+"+String.valueOf(b)+"=";i++;break;case 2: an[i]=a-b;bn[i]=String.valueOf(a)+"-"+String.valueOf(b)+"=";i++;break;case 3:an[i]=a*b;bn[i]=String.valueOf(a)+"*"+String.valueOf(b)+"=";i++;break;case 4:an[i]=a/b;bn[i]=String.valueOf(a)+"/"+String.valueOf(b)+"=";i++;break;}}while(i<5);for(int j=0;j<bn.length;j++){System.out.println(bn[j]);System.out.println(an[j]);}new yunsuan(an,bn);}}运算
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;public class yunsuan extends JFrame{JLabel l1 = new JLabel("答对题数:");private JFrame frame = new JFrame("四则运算");    private Container c = frame.getContentPane();    private JButton KO = new JButton("确定");private JTextField A = new JTextField(6);private JTextField AA = new JTextField(4);private JTextField AAA = new JTextField(4);private JTextField B = new JTextField(6);private JTextField BB = new JTextField(4);private JTextField BBB = new JTextField(4);private JTextField C = new JTextField(6);private JTextField CC = new JTextField(4);private JTextField CCC = new JTextField(4);private JTextField D = new JTextField(6);private JTextField DD = new JTextField(4);private JTextField DDD = new JTextField(4);private JTextField E = new JTextField(6);private JTextField EE = new JTextField(4);private JTextField EEE = new JTextField(4);private JPasswordField password = new JPasswordField();    private JButton ok = new JButton("确定");private JTextField QQ = new JTextField(6);int num=0;int an[]=new int [5];String bn[]=new String [5];String cn[]=new String [5];yunsuan(int a[],String b[]) {    an=a;bn=b;JPanel fieldPanel = new JPanel();fieldPanel.add(A);A.setBounds(30, 10, 100, 20);A.setVisible(true);fieldPanel.add(AA);AA.setBounds(40, 10, 100, 20);fieldPanel.add(AAA);AAA.setBounds(50, 10, 100, 20);fieldPanel.add(B);B.setBounds(30, 15, 50, 20);fieldPanel.add(BB);BB.setBounds(40, 15, 100, 20);fieldPanel.add(BBB);BBB.setBounds(50, 10, 100, 20);fieldPanel.add(C);C.setBounds(30, 20, 50, 20);fieldPanel.add(CC);CC.setBounds(40, 20, 100, 20);fieldPanel.add(CCC);CCC.setBounds(50, 10, 100, 20);fieldPanel.add(D);D.setBounds(30, 25, 50, 20);fieldPanel.add(DD);DD.setBounds(40, 25, 100, 20);fieldPanel.add(DDD);DDD.setBounds(50, 10, 100, 20);fieldPanel.add(E);E.setBounds(30, 30, 50, 20);fieldPanel.add(EE);EE.setBounds(40, 30, 100, 20);fieldPanel.add(EEE);EEE.setBounds(50, 10, 100, 20);fieldPanel.add(KO);KO.setBounds(30, 50, 20, 20);fieldPanel.add(l1);l1.setBounds(20, 60, 100, 20);fieldPanel.add(QQ);QQ.setBounds(40, 70, 100, 20);KO.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent arg0) {cn[0]=AA.getText();cn[1]=BB.getText();cn[2]=CC.getText();cn[3]=DD.getText();cn[4]=EE.getText();AAA.setText(String.valueOf(an[0]));BBB.setText(String.valueOf(an[1]));        CCC.setText(String.valueOf(an[2]));                DDD.setText(String.valueOf(an[3]));EEE.setText(String.valueOf(an[4]));for(int i=0;i<an.length;i++)if(String.valueOf(an[i]).equals(cn[i]))num++;QQ.setText(String.valueOf(num));}});fieldPanel.setVerifyInputWhenFocusTarget(true);A.setText(bn[0]);B.setText(bn[1]);C.setText(bn[2]);D.setText(bn[3]);E.setText(bn[4]);this.add(fieldPanel);
this.setBounds(400, 400, 250, 270);
this.setVisible(true);}}