Randum String generate

public class RandomString {

public void getRamdomString()
{
java.util.Random r = new java.util.Random();
//System.out.print(r.nextInt());
int i = 1, n = 0;
char c;
String str="";
for (int t = 0; t < 5; t++) {
//number of alfabat characters added in front of String token
while (true) {
i = r.nextInt(10);
if (i > 5 && i < 10) {

if (i == 9) {
i = 90;
n = 90;
break;
}
if (i != 90) {
n = i * 10 + r.nextInt(10);
while (n < 65) {
n = i * 10 + r.nextInt(10);
}
}
break;
}
}
c=(char)n;

str= String.valueOf(c)+str;
}
while(true){
i = r.nextInt(100000);// number of integer padded at last
if(i>9999) // number of integer padded at last
{
break;
}
}
str=str+i;
System.out.println(str);
}

public static void main(String[] args) {

RandomString obj=new RandomString();
while(true)
{
obj.getRamdomString();
}

}


}