/**

* 输入字符串a + b 计算结果

* @author Administrator

*

*/

public class StringCompute {

public static int ope(String str){

int result = 0;

String[] strs = str.split(" ");

if (strs.length==3) {

try {

int number1 = Integer.valueOf(strs[0]);

int number2 = Integer.valueOf(strs[2]);

if (number1>0 && number1<100 && number2>0 && number2<100 ) {

if (strs[1].equals("+")) {

result = number1+number2;

}else if (strs[1].equals("-")){

result=number1-number2;

}

}

} catch (Exception e) {

}

}

return result;

}

public static void main(String[] args) {

String string = "12 + 12";

int result = ope(string);

System.out.println(result);

string = "1 ++ 12";

result = ope(string);

System.out.println(result);

}

}

test