To disable the restriction to clone files with very long name (i.e. include path and filename) use the following command:
git config --global core.longPaths true
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To provide which ssl backend to use with git use the following syntax:
git config --global http.sslBackend <SSL_BACKEND>
The SSL_BACKEND token can potentially be openssl or schannel.
schannel uses the windows certicate store.
Example
git config --global http.sslBackend schannel
A double quoted string prefixed with an at (@) sign symbol will be interpreted verbatim.
Syntax
@"<STRING>"
The STRING token can have simple escaped sequences (e.g. \\ for backslash), hexadecimal escape sequence (i.e. \x<HEX_NUMBER>) and unicode escape sequences (i.e. \u<HEX_NUMBER>) that are interpreted literally. However, the "" will still be escaped an will produce a single double quote mark.
Verbatim string literal and string interpolation can be combined with the syntax as $@"<STRING>". Moreover, the {{ or }} will still be escaped.
Example
var string1 = "C:\\Windows\\System32" var string2 = @"C:\Windows\System32" Console.WriteLine(string1) Console.WriteLine(string2)
The writelines will produce the same output.
A double quoted string prefixed with a dollar ($) sign symbol can includes interpolation expression.
Syntax
$"<STRING>"
The STRING token can have interpolation expression and has the following syntax:
{<INTERPOLATION_EXPRESSION>[,<ALIGNMENT>][:<FORMAT_STRING>]}
| Token | Description |
| INTERPOLATION_EXPRESSION | The part that will produce a formatted output. |
| ALIGNMENT | Imposed a minimum number of character. If positive it is right-aligned and if negative it is left-aligned. |
| FORMAT_STRING | A format that is supported by the expression. Find more on here. |
If you needed to include { or } in your string output, escape it as {{ or }} respectively on which ever you need.
Example
var name = "World"
var greeting = $"Hello {name}"
//A Stream of Integers
var ints = Stream.of(10, 20, 30 , 40);
//Calculate the average using the Collectors.teeing method.
long average = ints.collect(
Collectors.teeing(
//Sum all of the integers in the stream.
Collectors.summingInt(Integer::valueOf),
//Count the content of the stream.
Collectors.counting(),
//Calculate the average.
( sum, count) -> sum / count
)
);
System.out.println(average);
//Create an instance of HttpClient using its builder.
HttpClient httpClient = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_2)
.build();
//Create an instance of HttpRequest using its builder.
HttpRequest req = HttpRequest.newBuilder(URI.create("https://www.google.com"))
.GET()
.build();
/* Use the httpClient.sendAsync() method and encapsulate the response
in the CompletableFuture. */
CompletableFuture<HttpResponse> resFuture =
httpClient.sendAsync(req, HttpResponse.BodyHandlers.ofString());
//Use the resFuture.thenAccept to wait for the async response.
resFuture.thenAccept(res -> System.out.println(res.version()));
//Wait for the resFuture to to complete.
resFuture.join();
Syntax
var VARIABLE = TYPED_VALUE;
| Token | Description |
| VARIABLE | An identifier the can hold a value. |
| TYPED_VALUE | The value that has an identifiable type. |
Syntax
switch(VARIABLE) {
case MATCH_1 [, MATCH_2][, MATCH_N] -> EXPRESSION; | THROW-STATEMENT; | BLOCK
default -> EXPRESSION; | THROW-STATEMENT; | BLOCK
}
| Token | Description |
| VARIABLE | The variable to test. |
| MATCH_1, MATCH_2, MATCH_N | The value or values that can match the VARIABLE. |
| EXPRESSION | A expression to execute. |
| THROW-STATEMENT | A expression that throws an exception. |
| BLOCK | A block of statements to execute.
If a return value is required use the yield keyword instead of return. |
Example
public enum Day {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY;
}
Day day = Day.WEDNESDAY;
int numLetters = switch (day) {
case MONDAY, FRIDAY, SUNDAY -> 6;
case TUESDAY -> 7;
case THURSDAY, SATURDAY -> {
System.out.println(8);
yield 8;
}
case WEDNESDAY -> {
System.out.println(9);
yield 9;
}
default -> {
throw new IllegalStateException("Invalid day: " + day);
}
};
System.out.println(numLetters);
- Favor composition over inheritance.
- Block of codes must not be more than 60 lines.
- Cyclomatic complexity of 1 to 10 as long as you can still write unit tests.
- Idempotent implementation.
Use the following java option to have a more verbose exception message especially for NullPointerException:
-XX:+ShowCodeDetailsInExceptionMessages
For example, if we have the following snippet:
var a = null; a.b = 1;
Running the above snippet will have the following exception:
Exception in thread "main" java.lang.NullPointerException: Cannot assign field "b" because "a" is null
Note: This is more useful if the classes were compiled with debugging info (i.e. javac -g )
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