【JAVA程序设计】第一轮编程题 第二题

二.接收用户输入的表达式，把操作数和运算符分开显示出来。

如：输入的表达式为：1+2
    那么输出为：操作数：1 2
                运算符：+


import java.io.IOException;
import java.util.Vector;

/**
* <p>Title:</p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2006</p>
* <p>Company: </p>
* @author Alex Zhu
* @version 1.0
*/

public class SplitExpression {
  public SplitExpression() {
  }
  public static void main(String[] args) {
    try {
      System.out.println("Input the expression please:");
      String operand = new String();
      String operator = new String();
      byte[] buffer = new byte[255];
      System.in.read(buffer);
      String expression = new String(buffer).trim();
      for(int i=0;i<expression.length();i++){
        String eachCharactor = expression.substring(i, i + 1);
        try {
          Integer.parseInt(eachCharactor);
          operand += eachCharactor;
        }
        catch (NumberFormatException ex1) {
          operand +=" ";
          if(eachCharactor.equals("+")||
             eachCharactor.equals("-")||
             eachCharactor.equals("*")||
             eachCharactor.equals("/")||
             eachCharactor.equals("%")){
            operator += eachCharactor + " ";
          }else{
            System.out.println("Expression["+expression+"]'s operator was wrong!");
            System.exit(0);
          }
        }
      }
        System.out.println("Operand: "+operand);
        System.out.println("Operator: "+operator);
    }
    catch (IOException ex) {
    }
  }
}