Валидатор не принимает Character.isDigit() ?
package com.javarush.task.task19.task1913;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
/*
Выводим только цифры
*/
public class Solution {
public static TestString testString = new TestString();
public static void main(String[] args) throws Exception {
PrintStream consoleStream = System.out;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
PrintStream stream = new PrintStream(outputStream);
System.setOut(stream);
testString.printSomething();
String result = outputStream.toString();
System.setOut(consoleStream);
for (Character c:result.toCharArray()) {
if (Character.isDigit(result.charAt(c))) {
System.out.print(c);
}
}
}
public static class TestString {
public void printSomething() {
System.out.println("it's 1 a 23 text 4 f5-6or7 tes8ting");
}
}
}