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How to quit a java app from within the program
What's the best way to quit a Java application with code?
12 Answers
12
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How to force garbage collection in Java?
Is it possible to force garbage collection in Java, even if it is tricky to do? I know about System.gc(); and Runtime.gc(); but they only suggest to do GC. How can I force GC?
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Understanding spring @Configuration class
...ive.profiles and set the environment variable. Spring now recommends using java config - docs.spring.io/spring-boot/docs/current/reference/htmlsingle/…
– Jack Viers
Dec 22 '14 at 18:54
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Is it possible to read the value of a annotation in java?
...opied the link here so people can use it.
Example from this page:
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;
@Retention(RetentionPolicy.RUNTIME)
@interface MyAnno {
String str();
int val();
}
class Meta {
@MyAnno(s...
Converting java.util.Properties to HashMap
java.util.Properties is a implementation of java.util.Map , And java.util.HashMap's constructor receives a Map type param. So, why must it be converted explicitly?
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How to convert hashmap to JSON object in Java
How to convert or cast hashmap to JSON object in Java, and again convert JSON object to JSON string?
29 Answers
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package R does not exist
...anifest.xml file.
If there are no errors in the resource XML files, the R.java source
will be generated in a package subdirectory below gen/ and compiled.
There is another R class located in the android package. This android.R class contains some nested classes, which in turn contain ids and oth...
Mockito match any class argument
...using the second version here. The first version did not cut it for me (on Java 8 that is).
– Patru
Apr 25 '19 at 8:18
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Concatenating null strings in Java [duplicate]
...m.out.println(s); // prints "nullhello"
(You can do so yourself by using javap -c)
The append methods of StringBuilder all handle null just fine. In this case because null is the first argument, String.valueOf() is invoked instead since StringBuilder does not have a constructor that takes any ar...
How to quickly and conveniently create a one element arraylist [duplicate]
...List like
return new ArrayList<String>(Arrays.asList(s));
and (in Java 7+) you can use the diamond operator <> to make it
return new ArrayList<>(Arrays.asList(s));
Single Element List
Collections can return a list with a single element with list being immutable:
Collection...