Commit b56368f

author

deeper

committed

添加单例模式

1 parent 238a2af commit b56368fCopy full SHA for b56368f

File tree

+77

-0

lines changed

+77

-0

lines changed

Lines changed: 24 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,24 @@`
	`1`	`+package com.ruoxu.pattern.singleton;`
	`2`	`+`
	`3`	`+public class Demo {`
	`4`	`+ public static void main(String[] args) {`
	`5`	`+ Singleton1 instance11 = Singleton1.getInstance();`
	`6`	`+ Singleton1 instance12 = Singleton1.getInstance();`
	`7`	`+`
	`8`	`+ Singleton2 instance21 = Singleton2.getInstance();`
	`9`	`+ Singleton2 instance22 = Singleton2.getInstance();`
	`10`	`+`
	`11`	`+ Singleton3 instance31 = Singleton3.getInstance();`
	`12`	`+ Singleton3 instance32 = Singleton3.getInstance();`
	`13`	`+`
	`14`	`+ Singleton4 instance41 = Singleton4.getInstance();`
	`15`	`+ Singleton4 instance42 = Singleton4.getInstance();`
	`16`	`+`
	`17`	`+ System.out.println(instance11==instance12);`
	`18`	`+ System.out.println(instance21==instance22);`
	`19`	`+ System.out.println(instance31==instance32);`
	`20`	`+ System.out.println(instance41==instance42);`
	`21`	`+`
	`22`	`+`
	`23`	`+ }`
	`24`	`+}`

Lines changed: 10 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,10 @@`
	`1`	`+package com.ruoxu.pattern.singleton;`
	`2`	`+`
	`3`	`+public class Singleton1 {`
	`4`	`+ // 饿汉模式`
	`5`	`+ private static final Singleton1 singleton = new Singleton1();`
	`6`	`+`
	`7`	`+ public static Singleton1 getInstance(){`
	`8`	`+ return singleton;`
	`9`	`+ }`
	`10`	`+}`

Lines changed: 13 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,13 @@`
	`1`	`+package com.ruoxu.pattern.singleton;`
	`2`	`+`
	`3`	`+public class Singleton2 {`
	`4`	`+ // 懒汉模式`
	`5`	`+ private static Singleton2 instance;`
	`6`	`+`
	`7`	`+ public static synchronized Singleton2 getInstance(){//synchronized在此处导致速度略慢`
	`8`	`+ if(instance == null){`
	`9`	`+ instance = new Singleton2();`
	`10`	`+ }`
	`11`	`+ return instance;`
	`12`	`+ }`
	`13`	`+}`

Lines changed: 17 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,17 @@`
	`1`	`+package com.ruoxu.pattern.singleton;`
	`2`	`+`
	`3`	`+public class Singleton3 {`
	`4`	`+ // Double Check Lock(DCL) 推荐1`
	`5`	`+ private static Singleton3 instance = null;`
	`6`	`+`
	`7`	`+ public static Singleton3 getInstance(){`
	`8`	`+ if(instance == null){`
	`9`	`+ synchronized (Singleton3.class) {`
	`10`	`+ if(instance==null){`
	`11`	`+ instance = new Singleton3();`
	`12`	`+ }`
	`13`	`+ }`
	`14`	`+ }`
	`15`	`+ return instance;`
	`16`	`+ }`
	`17`	`+}`

Lines changed: 13 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,13 @@`
	`1`	`+package com.ruoxu.pattern.singleton;`
	`2`	`+`
	`3`	`+public class Singleton4 {`
	`4`	`+ // 静态内部类推荐2`
	`5`	`+ public static Singleton4 getInstance(){`
	`6`	`+ return Holder.instance;`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ private static class Holder{`
	`10`	`+ private static final Singleton4 instance = new Singleton4();`
	`11`	`+ }`
	`12`	`+`
	`13`	`+}`

Comments

(0)