java - 在 Java 中打印字符串中的无效输入

Question

我正在尝试打印无效数字，该数字不是 int 或 double 类型，但没有获得所需的输出，请帮助我指出我的错误，另一件事是可以使用其他方式找出无效数字吗？

public class Test {
            public static void main(String [] args)
        {

        String [] str ={ "10.20","30450","12.valid","100.200"};

            for(int i=0; i<str.length; i++)
            {
                if(str[i].indexOf(".")>0)
                {
                    try
                    {
                        Integer.parseInt(str[i]);
                        System.out.println("its a valid int nummber : "+str[i]);
                    }
                    catch(NumberFormatException e)
                    {
                        System.out.println("its invalid number in string: "+str[i]);
                    }
                }
                else
                {
                    try
                    {
                        Double.parseDouble(str[i]);
                        System.out.println("its valid double number: "+str[i]);
                    }

                    catch(NumberFormatException e)
                    {
                        System.out.println("its invalid char in string : "+str[i]);
                    }
                }
            }
        }
    }

输出

its invalid number is string: 10.20

its valid double number: 30450

its invalid number is string: 12.valid

its invalid number is string: 100.200

Answer 1

if/else 中的代码应该是相反的:

               if(str[i].indexOf(".")>0)
                {
                   ///parse for double
                }
                else
                {
                   //parse for int
                }