源代码：
package zuoye2;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
class jiemian
{
public jiemian()
{
JFrame jf=new JFrame("四则运算");
jf.setBounds(200, 100, 500, 500);
jf.setLayout(null);
Container c=jf.getContentPane();
JCheckBox j1=new JCheckBox("有乘除法");
JCheckBox j2=new JCheckBox("有括号");
JCheckBox j3=new JCheckBox("有负数");
JCheckBox j4=new JCheckBox("有余数");
JLabel l1=new JLabel("请输入数值范围");
JLabel l4=new JLabel("请输入参数个数（1—10）");
JLabel l2=new JLabel("—");
JLabel l3=new JLabel("请输入题目数目(1-30)");
JTextField t1=new JTextField("2");
JTextField t2=new JTextField("20");
JTextField t3=new JTextField("30");
JTextField t4=new JTextField("30");
j1.setBounds(100, 100, 80,20);
j2.setBounds(100, 130, 80,20);
l4.setBounds(100, 160, 180,20);
j3.setBounds(100, 220, 80,20);
j4.setBounds(100, 250, 80,20);
t1.setBounds(100, 190, 50,20);
l1.setBounds(100, 280, 150,20);
t2.setBounds(100, 310, 50,20);
t3.setBounds(180, 310, 50,20);
l2.setBounds(160, 310, 30,20);
l3.setBounds(100, 340, 150,20);
t4.setBounds(100, 370, 50,20);
c.add(j1);
c.add(j2);
c.add(j3);
c.add(l4);
c.add(j4);
c.add(t1);
c.add(l1);
c.add(t2);
c.add(t3);
c.add(l2);
c.add(l3);
c.add(t4);
JButton b1=new JButton("确定");
JButton b2=new JButton("退出");
b1.setBounds(350, 150,70, 50);
b2.setBounds(350, 300,70, 50);
c.add(b1);
c.add(b2);
b1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e)
{
jf.dispose();
String a1,a2,a3,a4,a5;
int c1,c2,c3,c4,c5;
boolean f1=false,f2=false,f3=false,f4=false,f5=false;
a1=t1.getText().toString();
a2=t2.getText().toString();
a3=t3.getText().toString();
a4=t4.getText().toString();
if(a2.equals("")||a3.equals(""))
{
JOptionPane.showMessageDialog(null, "范围不能为空", "范围不能为空", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
else if(a4.equals(""))
{
JOptionPane.showMessageDialog(null, "数目不能为空", "数目不能为空", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
else if (a1.equals(""))
{
JOptionPane.showMessageDialog(null, "参数个数不能为空", "参数个数不能为空", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
else if(Integer.parseInt(a1)>10||Integer.parseInt(a1)<=0)
{
JOptionPane.showMessageDialog(null, "参数个数超出", "参数个数超出", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
else if(Integer.parseInt(a4)<=0||Integer.parseInt(a4)>30)
{
JOptionPane.showMessageDialog(null, "题目数目不正确", "题目数目不正确", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
else if(Integer.parseInt(a3)<=Integer.parseInt(a2))
{
JOptionPane.showMessageDialog(null, "范围不正确", "范围不正确", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
if(j1.isSelected())
{
f1=true;
}
if(j2.isSelected())
{
f2=true;
}
if(j3.isSelected())
{
f3=true;
}
if(j4.isSelected())
{
f4=true;
}
c1=Integer.parseInt(a1);
c2=Integer.parseInt(a2);
c3=Integer.parseInt(a3);
c4=Integer.parseInt(a4);
yunsuan a=new yunsuan(c1,c2,c3,c4,f1,f2,f3,f4);
}
});
b2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e)
{
jf.dispose();
}
});
jf.setVisible(true);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
package zuoye2;
public class m extends jiemian
{
public static void main(String[] args)
{
// TODO Auto-generated method stub
jiemian a=new jiemian();
}
}
package zuoye2;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
public class yunsuan implements Runnable
{
JFrame jf=new JFrame("四则运算");
Container c=jf.getContentPane();
int i1,i2,i3,i4,anwser;
boolean j1,j2,j3,j4;
JTextField j5;
Thread t;
protected void ks()
{
t=new Thread(this);
}
public yunsuan(int c1, int c2, int c3, int c4, boolean f1, boolean f2, boolean f3, boolean f4)
{
i1=c1;
i2=c2;
i3=c3;
i4=c4;
j1=f1;
j2=f2;
j3=f3;
j4=f4;
JButton bu1=new JButton("提交");
JButton bu2=new JButton("退出");
bu1.setBounds(20, 100, 60, 20);
bu2.setBounds(100, 100, 60, 20);
c.add(bu1);
c.add(bu2);
ks();
t.start();
bu1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
String qs;
qs=j5.getText().toString();
if(qs.equals(""))
{
JOptionPane.showMessageDialog(null, "答案为空", "答案为空", JOptionPane.ERROR_MESSAGE);
}
else if(anwser==Integer.parseInt(qs))
{
t.stop();
ks();
c.removeAll();
bu1.setBounds(20, 100, 60, 20);
bu2.setBounds(100, 100, 60, 20);
c.add(bu1);
c.add(bu2);
t.start();
c.repaint();
jf.setVisible(true);
}
else
{
JOptionPane.showMessageDialog(null, "答案错误", "答案错误", JOptionPane.ERROR_MESSAGE);
}
}
});
bu2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e)
{
jf.dispose();
}
});
jf.setBounds(250, 200, c1*150+100, 200);
jf.setLayout(null);
jf.setVisible(true);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
@Override
public void run()
{
int c1,c2,c3,c4;
boolean f1,f2,f3,f4;
//Container c=jf.getContentPane();
c1=i1;
c2=i2;
c3=i3;
c4=i4;
f1=j1;
f2=j2;
f3=j3;
f4=j4;
int a,b,d = 0,e;
String a1,b1,d1;
JLabel j1,j2,j3,j4,j7;
j1=new JLabel();
j2=new JLabel();
j3=new JLabel();
j4=new JLabel();
j7=new JLabel();
JTextField j6;
j5=new JTextField();
j6=new JTextField();
Random r1[]=new Random[2];
Random r2=new Random();
int i,j=0,k=0,l;
j5=new JTextField();
j6=new JTextField();
for(i=0;i<2;i++)
{
r1[i]=new Random();
}
j5=new JTextField();
if(f1==true)
{
a=c3-c2;
b=c3-c2;
a=r1[0].nextInt(a);
b=r1[1].nextInt(b);
a=a+c2;
b=b+c2;
e=r2.nextInt(4);
}
else
{
a=c3-c2;
b=c3-c2;
a=r1[0].nextInt(a);
b=r1[1].nextInt(b);
a=a+c2;
b=b+c2;
e=r2.nextInt(2);
}
e=e+1;
if(f3!=false)
{
if(e==1)
{
a=r1[0].nextInt(c3-c2)+c2;
b=r1[1].nextInt(c3-c2)+c2;
d=a+b;
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("+");
j3=new JLabel(b1);
j4=new JLabel("=");
}
if(e==2)
{
a=r1[0].nextInt(c3-c2)+c2;
b=r1[1].nextInt(c3-c2)+c2;
d=a-b;
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("-");
j3=new JLabel(b1);
j4=new JLabel("=");
}
}
else
{
if(e==1)
{
a=r1[0].nextInt(c3-c2)+c2;
b=r1[1].nextInt(c3-c2)+c2;
d=a+b;
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("+");
j3=new JLabel(b1);
j4=new JLabel("=");
}
if(e==2)
{
int x;
a=r1[0].nextInt(c3-c2)+c2;
b=r1[1].nextInt(c3-c2)+c2;
if(b>a)
{
x=b;
b=a;
a=x;
}
d=a-b;
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("-");
j3=new JLabel(b1);
j4=new JLabel("=");
}
}
if(e==3)
{
a=r1[0].nextInt(c3-c2)+c2;
b=r2.nextInt(c3-c2)+c2;
d=a*b;
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("X");
j3=new JLabel(b1);
j4=new JLabel("=");
}
if(f4==false)
{
if(e==4)
{
d=r1[0].nextInt(c3-c2)+c2;
b=r1[1].nextInt(c3-c2)+c2;
a=b*d;
while(d==0||b==0)
{
r1[0]=new Random();
r1[1]=new Random();
d=r1[0].nextInt(20);
b=r1[1].nextInt(20);
a=b*d;
}
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("/");
j3=new JLabel(b1);
j4=new JLabel("=");
}
}
else
{
if(e==4)
{
j7=new JLabel("余");
a=r1[0].nextInt(c3-c2)+c2;
b=r1[1].nextInt(c3-c2)+c2;
while(a==0||b==0)
{
r1[0]=new Random();
r1[1]=new Random();
d=r1[0].nextInt(20);
b=r1[1].nextInt(20);
a=b*d;
}
a1=String.valueOf(a);
b1=String.valueOf(b);
d1=String.valueOf(d);
j1=new JLabel(a1);
j2=new JLabel("/");
j3=new JLabel(b1);
j4=new JLabel("=");
}
}
if(e==4&&f4==true)
{
j1.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j2.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j3.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j4.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j5.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j7.setBounds(65+j*42,50+(k/2)*32, 40, 30);
j++;
j6.setBounds(50+j*42,50+(k/2)*32, 40, 30);
j++;
j++;
j++;
k++;
if(k!=0&&k%2==0)
{
j=0;
}
c.add(j1);
c.add(j2);
c.add(j3);
c.add(j4);
c.add(j5);
c.add(j6);
c.add(j7);
}
else
{
j1.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j2.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j3.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j4.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j5.setBounds(50+j*42, 50+(k/2)*32, 40, 30);
j++;
j++;
j++;
j++;
j++;
k++;
if(k!=0&&k%2==0)
{
j=0;
}
c.add(j1);
c.add(j2);
c.add(j3);
c.add(j4);
c.add(j5);
}
anwser = d;
c.repaint();
jf.setVisible(true);
}
// TODO Auto-generated method stub
}
设计思路：
1.建立一个frame面板，通过添加复选框来选择是否有乘除法，是否有余数，是否有括号以及是否有负数
2.通过添加文本框来控制计算范围和题目数目。
3.当点击确定按钮，当前窗口关闭，数据提交，并新建一个frame窗口。
4.通过random产生随机数来控制计算题目以及加减乘除（0-3分别代表加减乘除，若没有选择有乘除，则产生0或1，从而将乘除运算排除掉）
5.根据是否选择有余数来控制除法。若没有余数，则将生成的两个随机数之积作为被除数，第二个随机数作为除数。
6.若选择有负数，加减不做处理，否则比较减数与被减数大小。若减数大于被减数，则将二者交换。
7.通过建立JLabel数组来向窗口输出题目，题目坐标按照题目数累加
8.通过建立文本框来填入答案
9.括号和检验重复没做。
10.通过线程来控制题目更换
截图：
