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Q&A Tips for golfing in Java

Use higher versions of Java Seriously, it's crazy what sort of features have been added since Java 8. I hardly recognize the language anymore... Examples: Constructing Lists Before, you had to ...

posted 3y ago by Quintec‭

Answer
#1: Initial revision by user avatar Quintec‭ · 2021-10-13T13:23:20Z (about 3 years ago)
# Use higher versions of Java

Seriously, it's crazy what sort of features have been added since Java 8. I hardly recognize the language anymore...

Examples:

## Constructing Lists

Before, you had to do something like `Arrays.asList(new String[]{"a", "b", "c"})`, but in Java 9+ you have `List.of("a", "b", "c")`, some huge savings.

## `var` keyword

Self explanatory - since Java 10, instead of `ReallyLongTypeName a = x();`, you now can just do `var a = x();`.

## Strings

In Java 11, some cool stuff for Strings was added that could potentially be useful - for example, `.lines()` returns the String separated by newlines as a Stream (saving over `.split("\n")`).

## Fancy switch statements

Before:

```java
switch(thing){case A:return "a";case B:return "b";default:return "x";}
```

Java 13+:

```java
return switch(thing){case A->"a";case B->"b";default->"x";}
```

You can even have blocks of statements in any of the cases using `{}`.

There are many other new features that I did not think are relavant to golf, and many many others that I'm sure I missed - there is just so much stuff to unpack. Please contribute if you find something I missed!