first steps of the lexer

Exercise 5/Lexer.java

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+public class Lexer {
+    Lexer(String src_in) {
+        System.out.println(src_in);
+    }
+
+    public void run() {
+        System.out.println("Lexer runs.");
+    }
+}

Exercise 5/LexerTestApp.java

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+public class LexerTestApp {
+    public static void main(String[] Args) {
+        // Meldung bei Programmaufruf
+        System.out.println("Lexer Test App.");
+
+        Lexer this_Lexer = new Lexer("index = 2 * count + 42;");
+        this_Lexer.run();
+    }
+}