逆波兰表达式计算器java

以下是逆波兰表达式计算器的Java示例：

import java.util.Stack;

public class EvaluateReversePolishNotation {
    public int evalRPN(String[] tokens) {
        Stack<Integer> stack = new Stack<>();
        for (String token : tokens) {
            if (token.equals("+")) {
                int operand2 = stack.pop();
                int operand1 = stack.pop();
                stack.push(operand1 + operand2);
            } else if (token.equals("-")) {
                int operand2 = stack.pop();
                int operand1 = stack.pop();
                stack.push(operand1 - operand2);
            } else if (token.equals("*")) {
                int operand2 = stack.pop();
                int operand1 = stack.pop();
                stack.push(operand1 * operand2);
            } else if (token.equals("/")) {
                int operand2 = stack.pop();
                int operand1 = stack.pop();
                stack.push(operand1 / operand2);
            } else {
                stack.push(Integer.parseInt(token));
            }
        }
        return stack.pop();
    }
}