四则运算的代码
package bb;
import java.util.Random;
public class Sizeyunsuan {
public static void main(String[] args) {
Random random=new Random();
for(int i=1;i<=30;i++) {
int num1=random.nextInt(10)+1;
int num2=random.nextInt(10)+1;
int xuanze=random.nextInt(4)+1;
int result=0;
String fuhao="";
switch(xuanze) {
case(1):
fuhao="+";
result=num1+num2;
break;
case(2):
fuhao="-";
result=num1-num2;
break;
case(3):
fuhao="";
result=num1num2;
break;
case(4):
fuhao="/";
result=num1/num2;
break;
}
System.out.println("第"+i+"题:"+num1+fuhao+num2+"="+result);
}
}
}
验证码的代码
package bb;
import java.util.Random;
import java.util.Scanner;
public class VerifyCodeGenerator {
public static String generateVerifyCode(int length) {
String chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
Random random = new Random();
StringBuilder verifyCode = new StringBuilder();
for (int i = 0; i < length; i++) {
int index = random.nextInt(chars.length());
verifyCode.append(chars.charAt(index));
}
return verifyCode.toString();
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String verifyCode = generateVerifyCode(4);
System.out.println("验证码：" + verifyCode);
System.out.print("请输入验证码：");
String inputCode = scanner.next();
if (inputCode.equalsIgnoreCase(verifyCode)) {
System.out.println("验证码输入正确！");
} else {
System.out.println("验证码输入错误！");
}
scanner.close();
}
}