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up vote 2 down vote favorite

I'm getting response in this manner: 

[{Id=1066276530, Key1=1815401000238}, {Id=1059632250, Key1=1815401000244}]

When I iterate and convert the values into a string, it throws me the error: 

java.lang.Long cannot be cast to java.lang.String in Java

 for (Map<String, String> map : leadIds) {
        for (Map.Entry<String, String> entry : map.entrySet()) {
            String applicationNumber = (String) entry.getValue();
        }
}

I want to convert the value into a string. Is there any issue here?

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5  
It seems that you have coerced the generics in order to force the compiler to think you have a Map<String, String> when you have a Map<String, Long>. Please show the declaration of leadIds. – Boris the Spider Jun 26 '15 at 7:00
up vote 3 down vote

Use String.valueOf() instead of casting:

for (Map<String, Long> map : leadIds) {
        for (Map.Entry<String, Long> entry : map.entrySet()) {
            String applicationNumber = String.valueOf(entry.getValue());
        }
}
share|improve this answer
1  
Entry<String, String> already has getValue as a String. No amount of adding arbitrary toString calls will change that. The issue is with the generics. – Boris the Spider Jun 26 '15 at 7:01
    
Ok, I know your issue. Could you up the code which process the input data? – codeaholicguy Jun 26 '15 at 7:09
up vote 1 down vote

Because String and Long are completely different types you cannot cast them, but you can use static method String.valueOf(Long value) and backwards Long.valueOf(String value).

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