Created
March 14, 2019 18:21
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Export of my JShell session for the Writing clean code with modern Java session at ConFoo 2019.
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List<Integer> list = new ArrayList<Integer>() | |
list.add(1) | |
list.add(2) | |
list.add(3) | |
list = Collections.unmodifiableList(list) | |
List<Integer> list2 = new ArrayList<Integer>(list) | |
List<Integer> list2 = Collections.unmodifiableList(new ArrayList<Integer>(list)) | |
List<Integer> list = List.of(1,2,3) | |
list.add(4) | |
list.getClass() | |
Map.ofEntries(entry(1, "hello")) | |
List<Integer> list2 = List.copyOf(list) | |
list2.add(4) | |
Set.copyOf(list) | |
list.stream().collect(toUnmodifiableSet()) | |
interface MyInterface {} | |
class MyClass implements MyInterface {} | |
new MyClass() | |
interface MyInterface { | |
default void defaultMethod() { | |
System.out.println("default method"); | |
} | |
} | |
new MyClass().defaultMethod() | |
interface MyInterface { | |
default void defaultMethod() { | |
privateMethod(): | |
System.out.println("default method"); | |
} | |
private void privateMethod(){ | |
System.out.println("private method"); | |
} | |
} | |
interface MyInterface { | |
default void defaultMethod() { | |
privateMethod(); | |
System.out.println("default method"); | |
} | |
private void privateMethod(){ | |
System.out.println("private method"); | |
} | |
} | |
new MyClass().defaultMethod() | |
new MyClass().privateMethod() | |
/env | |
int x = 0 | |
switch (x) { case 0 -> 0; default -> 1; } | |
switch (x) { case 0,1 -> 0; default -> 1; } | |
switch (x) { default -> System.out.println(x); } | |
switch (x) { default -> { System.out.println(x); break x; }} | |
var x = "hello" | |
/v x | |
int x | |
var x | |
var x = null | |
var x = (Integer) null | |
var x=0, y=0 | |
int inc(int x) { return x+1; } | |
int inc(var x) { return x+1; } | |
var inc(int x) { return x+1; } | |
class MyClass { var x = 1; } | |
try {} catch (var ex) {} | |
var x = new int[]{1,2} | |
var x = {1,2} | |
var[] x = {1,2} | |
short x =1 | |
var x =1 | |
/v x | |
Consumer c = (var x) -> System.out.println(x) | |
var c = (var x) -> System.out.println(x) | |
var list = new ArrayList<String>() | |
/v list | |
var list = new ArrayList<>() | |
/v list | |
List<?> list = List.of(1) | |
/v list | |
var x = list.get(0) | |
list.add(x) | |
/v x | |
var x = new Object() { int a=1; int b=2; } | |
x.a | |
/v x | |
Object x = new Object() { int a=1; int b=2; } | |
x.a | |
var var = 1 | |
; | |
void var() {} | |
class var{} |
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