如何从while循环返回2个布尔值？Java

Question

我尝试同时返回correctPiece和correctDest，但是

return correctPiece;

带下划线，并出现错误"Unreachable code“。

我怎么才能同时返回两个呢？

   while(correctPiece && !correctDest) {

            System.out.println("Click on a destination");

            toXCo = s.getToXInt();
            toYCo = s.getToYInt();

            Move found = null;

            for( Move m : moves){
                //checks if move can be done
                if (m.ToX() == toXCo && m.ToY() == toYCo){
                    //if move is allowed- exit loop
                    found = m; 
                    correctDest = true;
                }
            }

            if (found == null) {
                //if move can't be, ask for new co-ordinates
                System.out.println("This move is not legal \n");
                    correctDest = false;
                    correctPiece = false;
            }   
            return correctDest;
            return correctPiece;
        }

Answer 1

通过将您的return类型更改为boolean[]并使用类似于

return new boolean[] { correctDest, correctPiece };

Answer 2

您可以创建一个包含要返回的两个布尔值的类，然后创建一个该类的对象并返回该对象。

这种方法更好的原因是，如果你想在将来扩展响应，添加更多的参数，如果你有一个返回的对象，总是更容易做到这一点。

在这种情况下，您的代码将如下所示

while(correctPiece && !correctDest) {

        System.out.println("Click on a destination");

        toXCo = s.getToXInt();
        toYCo = s.getToYInt();

        Move found = null;

        for( Move m : moves){
            //checks if move can be done
            if (m.ToX() == toXCo && m.ToY() == toYCo){
                //if move is allowed- exit loop
                found = m; 
                correctDest = true;
            }
        }

        if (found == null) {
            //if move can't be, ask for new co-ordinates
            System.out.println("This move is not legal \n");
                correctDest = false;
                correctPiece = false;
        }   
        return new Response(correctDest, correctPiece);
    }

您可以创建一个响应类来捕获这两个值，如

private static class Response {

    boolean correctDest;
    boolean correctPiece;
    public Response(boolean correctDest, boolean correctPiece) {
        super();
        this.correctDest = correctDest;
        this.correctPiece = correctPiece;
    }


}

Answer 3

您可以将返回类型更改为boolean[]，这样就可以返回2个布尔值。