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Get keys from HashMap in Java

I have a Hashmap in Java like this: private Map<String, Integer> team1 = new HashMap<String, Integer>(); Then I fill it like this: team1.put("United", ...

May 29, 2022
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Get java.nio.file.Path object from java.io.File

Is it possible to get a Path object from a java.io.File? I know you can convert a path to a file using toFile() ...

May 23, 2022
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How to set specific Java version to Maven?

On my machine I have two Java versions installed: (1.6 and 1.7 installed manually by me). I need both of them for different ...

May 22, 2022
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Dealing with “java.lang.OutOfMemoryError: PermGen space” error

Recently I ran into this error in my web application: java.lang.OutOfMemoryError: PermGen space It’s a typical Hibernate/JPA + IceFaces/JSF application running on Tomcat ...

April 14, 2022
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Get keys from HashMap in Java

A HashMap contains more than one key. You can use keySet() to get the set of all keys. team1.put("foo", 1); team1.put("bar", 2); will ...

April 4, 2022
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