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Why do I need to override the equals and hashCode methods in Java?
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Joshua Bloch says on Effective Java
You must override hashCode() in every class that overrides equals(). Failure to do so will result in a violation of the general contract for Object.hashCode(), which will prevent your class from functioning properly in ...
What is the easiest way to get the current day of the week in Android?
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Use the Java Calendar class.
Calendar calendar = Calendar.getInstance();
int day = calendar.get(Calendar.DAY_OF_WEEK);
switch (day) {
case Calendar.SUNDAY:
// Current day is Sunday
break;
case Calendar.MOND...
Run a JAR file from the command line and specify classpath
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Specify everything (including your jar) on the commandline using -cp:
java -cp MyJar.jar:lib/* com.somepackage.subpackage.Main
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Java Byte Array to String to Byte Array
...e! I think you've completely understood what I was after... I'm not from a Java background, so I couldn't really figure out the conversion I needed. Just for info, I'm sending s1 to the server, and the server is replying with s1 (I can verify that the server received and replied with the data in s1)...
Type List vs type ArrayList in Java [duplicate]
...rn types being changed as well (will cause a NoSuchMethodException between Java versions if the internal return type changes). An example of this is the change in the return type of keySet in ConcurrentHashMap between Java 7 and 8.
– Rogue
Mar 12 '15 at 23:11
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How to supply value to an annotation from a Constant java
I am thinking this may not be possible in Java because annotation and its parameters are resolved at compile time. I have an interface as follows,
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How can I generate an MD5 hash?
Is there any method to generate MD5 hash of a string in Java?
34 Answers
34
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Difference between File.separator and slash in paths
...hat is the difference between using File.separator and a normal / in a Java Path-String?
14 Answers
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Convert Json Array to normal Java list
Is there a way to convert JSON Array to normal Java Array for android ListView data binding?
14 Answers
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How do I change the IntelliJ IDEA default JDK?
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May I ask IntelliJ IDEA to use my %JAVA_HOME% system variable as a value of JDK home path? I want IntelliJ IDEA to reflect changes of JAVA_HOME sys variable automatically.
– Ivan_Bereziuk
Nov 16 '17 at 10:48
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