/ **
* lazy simple interest thread-safe mode
* @author 15,735,400,536
* /
public class the Singleton {
/ **
* instance of the object
* /
Private the Singleton static Singleton;
/ **
* constructor privatization, external objects can not be created
* /
the Singleton Private () {
}
/ **
* Get example method
* @return
* /
public static the Singleton the getInstance () {
IF (Singleton == null) {
Singleton the Singleton new new = ();
}
return Singleton;
}
}
solution:
/ **
* Example lazy single thread safe
* @author 15,735,400,536
*
* /
public class IdlerSingleton {
/ **
* instance of the object
* /
Private static IdlerSingleton idlerSingleton;
/ **
* privatization constructor
* /
Private IdlerSingleton () {
}
/ **
* plus synchronized keyword
* @return
* /
public static synchronized idlerSingleton the getInstance () {
IF (idlerSingleton == null) {
idlerSingleton new new idlerSingleton = ();
}
return idlerSingleton;
}
// add sync block:
/ / public static IdlerSingleton getNewInstance () {
/ / if (null == idlerSingleton) {
// synchronized (IdlerSingleton.class) {
// idlerSingleton = new IdlerSingleton();
// }
// }
// return idlerSingleton;
// }
}
/ **
* single double-check mode insecurity in lazy interest simple interest occurs in multithreading solution
* @author 15,735,400,536
*
* /
public class DoubleCheckSingleton {
Private static volatile DoubleCheckSingleton doubleCheckSingleton;
Private DoubleCheckSingleton () {}
public static DoubleCheckSingleton the getInstance () {
IF (doubleCheckSingleton == null) {
the synchronized (DoubleCheckSingleton.class) {
IF (doubleCheckSingleton == null) {
doubleCheckSingleton new new DoubleCheckSingleton = ();
}
}
}
return doubleCheckSingleton;
}
}
/**
* 饿汉单例 线程安全
* @author 15735400536
*
*/
public class HungrySingleton {
/**
* 静态代码块
*/
static {
hungrySingleton = new HungrySingleton();
}
private static HungrySingleton hungrySingleton;
private HungrySingleton() {}
public static HungrySingleton getInstance() {
return hungrySingleton;
}
}
/ **
* starving simple interest thread safe
* @author 15,735,400,536
*
* /
public class NewHungrySingleton {
/ **
* Constant static instance of the object
* /
Private Final static NewHungrySingleton newHungrySingleton new new NewHungrySingleton = ();
Private NewHungrySingleton () {}
/ * *
* when starving NewHungrySingleton class loader, it is an object instance has been created
* @return
* /
public static NewHungrySingleton the getInstance () {
return newHungrySingleton;
}
}