Строка Java содержит число
str.matches(".*\\d.*");
DevPedrada
str.matches(".*\\d.*");public class ContainsExample {
public static void main(String args[]){
String sample = "krishna64";
char[] chars = sample.toCharArray();
StringBuilder sb = new StringBuilder();
for(char c : chars){
if(Character.isDigit(c)){
sb.append(c);
}
}
System.out.println(sb);
}