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

Question

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?

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
– Boris the Spider, Commented Jun 26, 2015 at 7:00

codeaholicguy · Accepted Answer · 2015-06-26 07:08:22Z

21

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());
        }
}

edited Jun 26, 2015 at 7:08

answered Jun 26, 2015 at 6:57

codeaholicguy

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2 Comments

Boris the Spider Over a year ago

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.

codeaholicguy Over a year ago

Ok, I know your issue. Could you up the code which process the input data?

Ihor Patsian · Accepted Answer · 2015-06-26 07:05:26Z

5

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).

answered Jun 26, 2015 at 7:05

Ihor Patsian

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