这个问题在这里已经有答案了：

关闭扫描仪而不关闭system.in（3个答案）
28天前关门了。
所以我的ide抱怨说如果我不把扫描仪放在一个try-with块中，但是如果我这样做而不是在应该关闭的时候关闭它（一旦win=true），它就会关闭系统。在流中，我该如何防止呢？

public final void turn() {
    System.out.println("Enter your next move!");
    try (Scanner keyboard = new Scanner(System.in)) {
        final String move = keyboard.nextLine();
        if (move.isEmpty()) {
            won = true;
            return;
        }
        if (!validateFormat(move)) {
            System.out.println("Invalid format, try again.");
            return;
        }
        String[] moveAr;
        try {
            moveAr = move.split(",");
        } catch (PatternSyntaxException e) {
            System.out.println(e.getMessage());
            return;
        }
        try {
            validFields(moveAr);
        } catch (InvalidTurnException e) {
            System.out.println(e.getMessage());
            return;
        }
        final char colour = spielFeld.getField(getColumn(moveAr[0].charAt(0)),Character.getNumericValue(moveAr[0].charAt(1)) - 1).getColour();
        for (final String string : moveAr) {
            final int line = Character.getNumericValue(string.charAt(1)) - 1;
            final int column = getColumn(string.charAt(0));
            spielFeld.cross(column,line);
            final int columni = getColumn(string.charAt(0));
            if (spielFeld.columnCrossed(columni)) {
                points += crossedValues(string.charAt(0));
            }
        }
        if (spielFeld.colourComplete(colour)) {
            points += COLOUR_POINTS;
            coloursCrossed++;
        }
        if (coloursCrossed >= 2) {
            won = true;
        }
    }
    System.out.println("Momentane Punkte: " + points);
}