Kotlin中常量和靜態方法
阿新 • • 發佈:2022-03-07
常量
Java中:
class StaticDemoActivity {
public static final String LOAN_TYPE = "loanType";
public static final String LOAN_TITLE = "loanTitle";
}
Kotlin中:
class StaticDemoActivity {
companion object {
val LOAN_TYPE = "loanType"
val LOAN_TITLE = "loanTitle"
}
}
或者
class StaticDemoActivity {
companion object StaticParams{
val LOAN_TYPE = "loanType"
val LOAN_TITLE = "loanTitle"
}
}
或者
class StaticDemoActivity {
companion object {
const val LOAN_TYPE = "loanType"
const val LOAN_TITLE = "loanTitle"
}
}
注:
const
關鍵字用來修飾常量,且只能修飾val
,不能修飾var
,companion object
的名字可以省略,可以使用Companion
來指代
引用常量(這裡的引用只針對於java引用kotlin程式碼)
TestEntity類引用StaticDemoActivity中的常量
class TestEntity {
public TestEntity () {
String title = StaticDemoActivity.Companion.getLOAN_TITLE();
}
}
或者
class TestEntity {
public TestEntity () {
String title = StaticDemoActivity.StaticParams.getLOAN_TITLE();
}
}
或者
class TestEntity {
public TestEntity () {
String title = StaticDemoActivity.LOAN_TITLE;
String type= StaticDemoActivity.LOAN_TYPE;
}
}
靜態方法
Java程式碼:
class StaticDemoActivity {
public static void test(){
、、、
}
}
Kotlin中:
class StaticDemoActivity {
companion object {
fun test(){
、、、
}
}
}
或者
class StaticDemoActivity {
companion object StaticParams{
fun test() {
、、、
}
}
}
引用靜態方法(這裡的引用只針對於java引用kotlin程式碼)
TestEntity類引用StaticDemoActivity中的靜態方法
class TestEntity {
public TestEntity () {
StaticDemoActivity.Companion.test();
}
}
或者
class TestEntity {
public TestEntity () {
StaticDemoActivity.StaticParams.test();
}
}
companion object {}
中用來修飾靜態常量
,或者靜態方法
,單例
等等