做网站封面要怎么做,网页制作网站花店,广州全屋定制,黄页电话号码本目录 1、饿汉模式
Java 写法#xff1a;
Kotlin 写法#xff1a;
Kotlin 这段代码反编译简化后如下#xff1a;
2、懒汉模式#xff0c;静态同步方法
Java 写法#xff1a;
Kotlin 写法#xff1a;
Kotlin 这段代码反编译简化后如下#xff1a;
3、懒…目录 1、饿汉模式
Java 写法
Kotlin 写法
Kotlin 这段代码反编译简化后如下
2、懒汉模式静态同步方法
Java 写法
Kotlin 写法
Kotlin 这段代码反编译简化后如下
3、懒汉模式双重检查 同步代码块
Java 写法
Kotlin 写法
Kotlin 这段代码反编译简化后如下
4、枚举方式
Java 写法
Kotlin 写法
5、静态内部类 静态代码块
Java 写法
Kotlin 写法之一
Kotlin 这段代码反编译简化后 如下
6、其他写法
Java 的一种写法
Kotlin 的一种写法 1、饿汉模式
Java 写法
public class SingletonDemo1 {private static SingletonDemo1 INSTANCE new SingletonDemo1();private SingletonDemo1() {}public static SingletonDemo1 getInstance() {return INSTANCE;}}
Kotlin 写法
object SingletonDemo1 {}
Kotlin 这段代码反编译简化后如下
public final class SingletonDemo1 {NotNullpublic static final SingletonDemo1 INSTANCE new SingletonDemo1();private SingletonDemo1() {}
} 2、懒汉模式静态同步方法
Java 写法
public class SingletonDemo2 {private volatile static SingletonDemo2 INSTANCE;private SingletonDemo2() {}public synchronized static SingletonDemo2 getInstance() {if (INSTANCE null) {INSTANCE new SingletonDemo2();}return INSTANCE;}}
Kotlin 写法
class SingletonDemo2 private constructor() {companion object {private var INSTANCE: SingletonDemo2? nullget() {if (field null) {field SingletonDemo2()}return field}Synchronizedfun get(): SingletonDemo2 {return INSTANCE!!}}}
Kotlin 这段代码反编译简化后如下
public final class SingletonDemo2 {NotNullpublic static final Companion Companion new Companion();private static SingletonDemo2 INSTANCE;private SingletonDemo2() {}public static final class Companion {private Companion() {}NotNullpublic final synchronized SingletonDemo2 get() {if (SingletonDemo2.INSTANCE null) {SingletonDemo2.INSTANCE new SingletonDemo2();}return SingletonDemo2.INSTANCE;}}public static void main(String[] args) {//调用方式SingletonDemo2 sd SingletonDemo2.Companion.get();}
} 3、懒汉模式双重检查 同步代码块
Java 写法
public class SingletonDemo3 {private volatile static SingletonDemo3 INSTANCE;private SingletonDemo3() {}public static SingletonDemo3 getInstance() {if (INSTANCE null) {synchronized (SingletonDemo3.class) {if (INSTANCE null) {INSTANCE new SingletonDemo3();}}}return INSTANCE;}}
Kotlin 写法
这段代码涉及到高阶函数和属性委托。
Lazy 内部实现类中包含了双重判断和同步锁代码块。
class SingletonDemo3 private constructor() {companion object {val INSTANCE: SingletonDemo3 by lazy(mode LazyThreadSafetyMode.SYNCHRONIZED) {SingletonDemo3()}}}
Kotlin 这段代码反编译简化后如下
public final class SingletonDemo2 {NotNullpublic static final SingletonDemo2.Companion Companion new SingletonDemo2.Companion();NotNullprivate static final Lazy INSTANCE$delegate;private SingletonDemo2() {}static {INSTANCE$delegate LazyKt.lazy(LazyThreadSafetyMode.SYNCHRONIZED, (Function0)null.INSTANCE);}public static final class Companion {private Companion() {}NotNullpublic final SingletonDemo2 getINSTANCE() {Lazy var1 SingletonDemo2.INSTANCE$delegate;Object var2 null;return (SingletonDemo2)var1.getValue();}}
} 4、枚举方式
Java 写法
public enum SingletonDemo4 {INSTANCE;public void otherMethod() {}}
Kotlin 写法
enum class SingletonDemo4 {INSTANCE;fun otherMethod() {}
}
枚举就不反编译了没什么区别。 5、静态内部类 静态代码块
Java 写法
public class SingletonDemo5 {private static class SingletonHolder {private static final SingletonDemo5 INSTANCE new SingletonDemo5();}private SingletonDemo5() {}public static final SingletonDemo5 getInstance() {return SingletonHolder.INSTANCE;}}
Kotlin 写法之一
class SingletonDemo5 private constructor() {companion object {val INSTANCE SingletonHolder.holder}private object SingletonHolder {val holder SingletonDemo5()}}
Kotlin 这段代码反编译简化后 如下
public final class SingletonDemo100 {NotNullpublic static final SingletonDemo100.Companion Companion new SingletonDemo100.Companion();NotNullprivate static final SingletonDemo100 INSTANCE;private SingletonDemo100() {}static {INSTANCE SingletonDemo100.SingletonHolder.INSTANCE.getHolder();}public static final class Companion {private Companion() {}NotNullpublic final SingletonDemo100 getINSTANCE() {return SingletonDemo100.INSTANCE;}}private static final class SingletonHolder {NotNullpublic static final SingletonDemo100.SingletonHolder INSTANCE new SingletonDemo100.SingletonHolder();NotNullprivate static final SingletonDemo100 holder new SingletonDemo100();NotNullpublic final SingletonDemo100 getHolder() {return holder;}}
} 6、其他写法
Java 的一种写法
通过静态代码块方式借助虚拟机在类加载时创建对象。
public class SingletonDemo6 {private volatile static SingletonDemo6 INSTANCE;static {INSTANCE new SingletonDemo6();}private SingletonDemo6() {}public static SingletonDemo6 getInstance() {return INSTANCE;}}
Kotlin 的一种写法
网上看别人写的有创意但是也很奇怪无法完整反编译。
class SingletonDemo10 private constructor(private val property: Int) {companion object {Volatileprivate var INSTANCE: SingletonDemo10? nullfun getInstance(property: Int): SingletonDemo10 {return INSTANCE ?: synchronized(this) {INSTANCE ?: SingletonDemo10(property).also { INSTANCE it }}}}}
