verwende nicht-veraltete Klassen

Darlehenberechner.java

@@ -1,7 +1,9 @@
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
 import java.io.IOException;
-import java.io.DataInputStream;
 import java.math.BigDecimal;
 import java.math.MathContext;
+import java.nio.charset.StandardCharsets;
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
 import java.text.ParseException;
@@ -165,7 +167,7 @@ class Darlehenberechner {
       DECIMAL_FORMAT.setParseBigDecimal(true);
 
       var konfig = new Konfiguration();
-      var dis = new DataInputStream(System.in);
+      var dis = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8));
       System.out.print("Darlehenswert: ");
       konfig.setDarlehenswert((BigDecimal) DECIMAL_FORMAT.parse(dis.readLine()));
       System.out.print("Zinssatz: ");