java
import java.util.Random;public class Co
{
public static void main(String[] args)
{
Random a=new Random();
char[] b=new char;
for (int i=0;i<b.length ;i++ )
{
int a1=a.nextInt(26);
char b1=(char)(65+a1);
for (int j=0;j<b.length ;j++ )
{
char b2=b;
}
if (b1==b2)
{
System.out.println("什么都别做");
}
else
{
b=b1;
}
}for (int i=0;i<b.length ;b1++ )
{
System.out.print(b);
}
}
}
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