android - 检查字符串是否仅包含 "+"符号和数字

Question

我有一个 String，有时值会改变:

String str1 = "+25"; // only have "+" sign and number

String str2 = "+Name"; // only have "+" sign and text

我怎样才能区分这些 String 因为我想做这样的事情:

if (isString1Type) { // both strings also have "+" sign
// do something
}

对于这种情况，String 有什么功能吗？谁能给我建议？

Answer 1

是的，你可以这样做:

 String str = "+Name";
 boolean hasPlusSign = str.contains("+");
 boolean isNumber = tryParseInt(str.replace("+", ""));
 if(hasPlusSign && isNumber){ //if the string is +25 for example here will be true, else it will go to the else statement
    //do something
} else {
    //something else
}


boolean tryParseInt(String value) {  
   try {  
       Integer.parseInt(value);  
       return true;  
    } catch (NumberFormatException e) {  
       return false;  
    }  
}