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目录一、饿汉式(静态常量)二、饿汉式(静态代码块)三、懒汉式(线程不安全)四、懒汉式(线程安全，同步方法)五、懒汉式(线程不安全，同步代码块)六、双重检查( DCL )七、静态内部类
public class Face {
private static final Face instance = new Face();
static Face getInstance() {
return instance;
}
private Face() {
}
}
public class Face {
private static Face instance;
static {
instance = new Face();
}
private Face() {
}
public static Face getInstance() {
return instance;
}
}
public class Face {
private static Face instance;
private Face() {
}
public static Face getInstance() {
if (null == instance) {
instance = new Face();
}
return instance;
}
}
public class Face {
private static Face instance;
private Face() {
}
public static synchronized Face getInstance() {
if (null == instance) {
instance = new Face();
}
return instance;
}
}
public class Face {
private static Face instance;
private Face() {
}
public static Face getInstance() {
if (null == instance) {
synchronized (Face.class) {
instance = new Face();
}
}
return instance;
}
}
public class Face {
private static volatile Face instance;
private Face() {
}
public static Face getInstance() {
if (null == instance) {
synchronized (Face.class) {
if (null == instance) {
instance = new Face();
}
}
}
return instance;
}
}
public class Face {
private static volatile Face instance;
private Face() {
}
private static class FaceInstance {
private static final Face faceInstance = new Face();
}
public static Face getInstance() {
return FaceInstance.faceInstance;
}
}
可以减少系统内存开支，减少系统性能开销，避免对资源的多重占用、同时操作
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