如何在安卓中将kotlin集转换为java

Question

kotlin设置代码如下：

val CITIES_WITH_LOGIN_ENABLED =
 setOf<CustomCity>(CustomCity.MUNICH, CustomCity.BERLIN, CustomCity.SAIGON, 
 CustomCity.TESTMUNICH, CustomCity.TBILISI)

我想把那个代码转换成java，它的等价java代码是什么

Answer 1

如果查看setOf()的定义，它相当于Java Set，它的不可变集只包含指定的对象，并且该集是可序列化的

您可以选中Menu > Tools > Kotlin > Show Kotlin Bytecode > Decompile

您可以使用HashSet将其序列化（注意类型）

Set<CustomCity> set = new HashSet<>(Arrays.asList(CustomCity.MUNICH,CustomCity.TBILISI));

Answer 2

您可以直接使用构造函数

Set<CustomCity> CITIES_WITH_LOGIN_ENABLES = new HashSet<>(Arrays.asList(CustomCity.MUNICH, CustomCity.BERLIN, CustomCity.SAIGON, CustomCity.TESTMUNICH, CustomCity.TBILISI));

Answer 3

Set<CustomCity> CITIES_WITH_LOGIN_ENABLED = new HashSet<CustomCity>

CITIES_WITH_LOGIN_ENABLED.add(CustomCity.MUNICH);
CITIES_WITH_LOGIN_ENABLED.add(CustomCity.BERLIN);
CITIES_WITH_LOGIN_ENABLED.add(CustomCity.TESTMUNICH);
CITIES_WITH_LOGIN_ENABLED.add( CustomCity.TBILISI);
 //TO print your set:
SYstem.out.println(CITIES_WITH_LOGIN_ENABLED);

Answer 4

Set<CustomCity> CITIES_WITH_LOGIN_ENABLED = new HashSet<>(
    Arrays.asList(
        CustomCity.MUNICH, 
        CustomCity.BERLIN,
        CustomCity.SAIGON,
        CustomCity.TESTMUNICH,
        CustomCity.TBILISI
    )
);