Java Stack Usage getOperands(Stack stack, int nOperands)

Description

get Operands

License

Open Source License

Declaration

private static String[] getOperands(Stack<String> stack, int nOperands) 

Method Source Code

//package com.java2s;
/*//www.j a va 2s  .  com
 *  Copyright (C) 2013, Peter Decsi.
 * 
 *  This library is free software: you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public 
 *  License as published by the Free Software Foundation, either 
 *  version 3 of the License, or (at your option) any later version.
 * 
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Stack;

public class Main {
    private static String[] getOperands(Stack<String> stack, int nOperands) {
        String[] operands = new String[nOperands];
        for (int j = nOperands - 1; j >= 0; j--) {
            if (stack.isEmpty()) {
                String msg = "Too few arguments supplied to operation. Expected (%d) operands but got (%d)!";
                msg = String.format(msg, nOperands, nOperands - j - 1);
                throw new IllegalStateException(msg);
            }

            operands[j] = stack.pop();
        }
        return operands;
    }
}

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