java - 在java中将按位运算符分配给变量

Question

我尝试将按位运算符分配给变量。我该怎么做？

例如

    String bitOp="";

        String rFunction=JOptionPane.showInputDialog(null,"Enter Your round function","Round function",JOptionPane.INFORMATION_MESSAGE);

         if(rFunction.toUpperCase()=="AND")
             bitOp="&";
         if(rFunction.toUpperCase()=="OR")
             bitOp="|";
         if(rFunction.toUpperCase()=="XOR")
             bitOp="^";

    int res= x +bitOp+ y; // if the operator is "AND" , this should be x & y.
                          //Here NumberFormatException error shows.
    System.out.print(res);

但是这不起作用。任何人请!!!

Answer 1

您可以制作自己的 BitOperator:

public enum BitOperator {
    AND {
        @Override
        public int calc(int x, int y) {
            return x & y;
        }
    },
    OR {
        @Override
        public int calc(int x, int y) {
            return x | y;
        }
    },
    XOR {
        @Override
        public int calc(int x, int y) {
            return x ^ y;
        }
    };

    public abstract int calc(int x,int y);

}

用法(添加一些异常处理):

          String rFunction=JOptionPane.showInputDialog(null,"Enter Your round function","Round function",JOptionPane.INFORMATION_MESSAGE);
          System.out.println(BitOperator.valueOf(rFunction.toUpperCase()).calc(x, y));