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SparseArray vs HashMap
...ted on heap by JVM.
They may vary depending on the specific JVM used.
The java.lang.instrument package contains some helpful methods for advanced operations like checking the size of an object with getObjectSize(Object objectToSize).
Extra info is available from the official Oracle documentation....
How should I copy Strings in Java?
...%2fstackoverflow.com%2fquestions%2f10607990%2fhow-should-i-copy-strings-in-java%23new-answer', 'question_page');
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The case against checked exceptions
... fact, I suspect Goslings motivation for not putting operator overrides in Java comes from a similar argument - they confuse the programmer because they are often abused.
But in the end, I find it a bogus argument of Hejlsberg's and possibly a post-hoc one created to explain the lack rather than a ...
Gson - convert from Json to a typed ArrayList
...t;(){}.getType());
Documentation:
Represents a generic type T.
Java doesn't yet provide a way to represent generic types, so this class does. Forces clients to create a subclass of this class which enables retrieval the type information even at runtime.
For example, to create a type...
How to obtain Signing certificate fingerprint (SHA1) for OAuth 2.0 on Android?
... copy Key Store Path.
Now open a command prompt and go to C:\Program
Files\Java\jdk1.6.0_39\bin> (or any installed jdk version).
Type keytool -list -v -keystore and then paste your Key Store
Path (Eg. C:\Program Files\Java\jdk1.6.0_39\bin>keytool -list -v
-keystore "E:\My Projects \A...
How do I set a JLabel's background color?
...is not painted, since the default of opaque is false for JLabel.
From the JavaDocs:
If true the component paints every pixel within its bounds. Otherwise, the component may not paint some or all of its pixels, allowing the underlying pixels to show through.
For more information, read the Jav...
How do I update the element at a certain position in an ArrayList? [duplicate]
...tring, then just do:
arrList.set(5, newValue);
This can be found in the java api reference here.
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Is it possible to iterate through JSONArray? [duplicate]
...or (int i = 0; i < arr.length(); i++) {
arr.getJSONObject(i);
}
For javax.json.JsonArray, you can do:
for (int i = 0; i < arr.size(); i++) {
arr.getJsonObject(i);
}
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How to preserve insertion order in HashMap? [duplicate]
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according to java doc it says: This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map.¿¿¿¿¿ NORMALLY ????? what does it mean? the order insertion is not garantee....
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How to auto-format code in Eclipse?
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Another option is to go to Window->Preferences->Java->Editor->SaveActions and check the Format source code option. Then your source code will be formatted truly automatically each time you save it.
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