在 Java 中 java.lang.Long 不能转换为 java.lang.String
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/31066811/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
java.lang.Long cannot be cast to java.lang.String in Java
提问by Syed
I'm getting response in this manner:
我以这种方式得到回应：
[{Id=1066276530, Key1=1815401000238}, {Id=1059632250, Key1=1815401000244}]
When I iterate and convert the values into a string, it throws me the error:
当我迭代并将值转换为字符串时，它会抛出错误：
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?
我想将值转换为字符串。这里有什么问题吗？
采纳答案by codeaholicguy
Use String.valueOf()instead of casting:
使用String.valueOf()代替铸造：
for (Map<String, Long> map : leadIds) {
for (Map.Entry<String, Long> entry : map.entrySet()) {
String applicationNumber = String.valueOf(entry.getValue());
}
}
回答by Igor Patsian
Because Stringand Longare completely different types you cannot cast them, but you can use static method String.valueOf(Long value)and backwards Long.valueOf(String value).
因为StringandLong是完全不同的类型，你不能强制转换它们，但你可以使用 static methodString.valueOf(Long value)和向后Long.valueOf(String value)。
