public class Lazy Singleton
private static LazySingleton newInstance = null;
if (newInstance == null)
newInstance = new LazySingleton ();
}
return newInstance;
}
singleton 限制了实例个数，有利于gc的回收。
实例一:浅拷贝
public class Prototype implements Cloneable {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
return null;
}
}
}
public class TestMain {
public static void main(String[] args) {
testPrototype();
}
private static void testPrototype(){
Prototype pro = new Prototype();
pro.setName("original object");
Prototype pro1 = (Prototype)pro.clone();
pro.setName("changed object1");
System.out.println("original object:" + pro.getName());
System.out.println("cloned object:" + pro1.getName());
}
}
结果:
original object:changed object1
cloned object:original object
public
class
ModuleA {
//
示意方法
public
void
testA(){
System.out.println(
"调用ModuleA中的testA方法"
);
}
}
public
class
ModuleB {
//
示意方法
public
void
testB(){
System.out.println(
"调用ModuleB中的testB方法"
);
}
}
public
class
ModuleC {
//
示意方法
public
void
testC(){
System.out.println(
"调用ModuleC中的testC方法"
);
}
}
门面角色类：
public
class
Facade {
//
示意方法，满足客户端需要的功能
public
void
test(){
ModuleA a
=
new
ModuleA();
a.testA();
ModuleB b
=
new
ModuleB();
b.testB();
ModuleC c
=
new
ModuleC();
c.testC();
}
}
