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Why doesn't java.lang.Number implement Comparable? [duplicate]
Does anyone know why java.lang.Number does not implement Comparable ? This means that you cannot sort Number s with Collections.sort which seems to me a little strange.
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Java 8 stream's .min() and .max(): why does this compile?
...ator!
The answer is in the way that the new lambda functionality works in Java 8. It relies on a concept which is informally known as "single abstract method" interfaces, or "SAM" interfaces. The idea is that any interface with one abstract method can be automatically implemented by any lambda - ...
Format in kotlin string templates
...n stdlib function that can be used in a nice way and fully compatible with Java's String format (it's only a wrapper around Java's String.format())
See Kotlin's documentation
Your code would be:
val pi = 3.14159265358979323
val s = "pi = %.2f".format(pi)
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How to properly compare two Integers in Java?
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As of Java 1.6.27+ there an overload on equals in the Integer class, so it should be as efficient as calling .intValue(). It compares the values as primitive int.
– otterslide
Sep 22 '16 at 17...
How to print a float with 2 decimal places in Java?
...ike so:
System.out.printf("%.2f", val);
In short, the %.2f syntax tells Java to return your variable (val) with 2 decimal places (.2) in decimal representation of a floating-point number (f) from the start of the format specifier (%).
There are other conversion characters you can use besides f:
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What is the best way to implement constants in Java? [closed]
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The previous comment about import static only applies to Java 5+. Some feel the shorthand isn't worth the possible confusion as to where the constant came from, when reading long code, MaxSeconds.MAX_SECONDS may be easier to follow then going up and looking at the imports.
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Should I use string.isEmpty() or “”.equals(string)?
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source code to the String class is available java2s.com/Open-Source/Java-Document/6.0-JDK-Core/lang/java/…
– David Young
Jul 24 '10 at 5:22
1
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“R cannot be resolved to a variable”? [duplicate]
...is the best way to solve this problem: [Android Development- Where is my R.Java file?][2]
R.java not regenerating
R cannot be resolved - Android error
R cannot be resolved to a variable
R cannot be resolved to a variable -- mailing list entry
Fixed: R cannot be resolved to a variable
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Is passing 'this' in a method call accepted practice in java
...estion is always easier to argument), I just opened one of the most common java.lang classes, the String one, and of course I found instances of this use, for example
1084 // Argument is a String
1085 if (cs.equals(this))
1086 return true;
Look for (this in big "accepted"...
UnmodifiableMap (Java Collections) vs ImmutableMap (Google) [duplicate]
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Now with Java 9, you can use: Map<String,String> unmodifiableMap = Map.ofEntries(entry("A","B"), entry("C","D"), entry("E","F")); which is more beautiful to my mind
– Steph
Sep 11 '18 at 13...