写一个函数，检查字符是否是整数，如果是，返回其整数值

public class Converter
{
public static Object convert(String s)
{
try
{
return Integer.valueOf(s);
} catch (Exception e)
{
return new Boolean(false);
}
}

public static void main(String[] args)
{
String s = "12334";
Object o = convert(s);
if (o instanceof Integer)
{
System.out.println(s
+ "     is     an     int     ,it's     value:"
+ ((Integer) o).intValue());
} else
{
System.out.println(s + "is     not     an     int.     ");
}
}

}