package com.aaa.demo;
public class JavaStudy implements ISoftwareStudy{
@Override
public void study() {
System.out.println("JAVA study");
}
}
package com.aaa.demo;
public class PhthonStudy implements ISoftwareStudy {
@Override
public void study() {
System.out.println("Phonth study");
}
}
package com.aaa.demo;
public class UIStudy implements ISoftwareStudy {
@Override
public void study() {
System.out.println("UI study");
}
}
package com.aaa.demo;
public interface ISoftwareStudy {
void study();
}
package com.aaa.demo;
public class AFactory {
public ISoftwareStudy getStudy(int num){
ISoftwareStudy s=null;
if (num==1){
s=new JavaStudy();
}else if(num==2){
s=new PhthonStudy();
}else if(num==3){
s=new UIStudy();
}
return s;
/**
*
* */
}
}
package com.aaa.demo;
/*
* 饿汉单例模式
* */
public class HungryDemo {
private HungryDemo(){
}
//静态的：在内存中只存在一个全局
private static HungryDemo s= new HungryDemo();
private static HungryDemo y=new HungryDemo();
public static HungryDemo getInstance(){
System.out.println("this change has come into effect!");
return s;
}
public static HungryDemo getInstances(){
System.out.println("This change has come into effect!");
return y;
}
}
package com.aaa.demo;
/*
* 饿汉单例模式
* */
public class HungryDemo {
private HungryDemo(){
}
//静态的：在内存中只存在一个全局
private static HungryDemo s= new HungryDemo();
private static HungryDemo y=new HungryDemo();
public static HungryDemo getInstance(){
System.out.println("this change has come into effect!");
return s;
}
public static HungryDemo getInstances(){
System.out.println("This change has come into effect!");
return y;
}
}
package com.aaa.demo;
public class StarvingDemp {
private StarvingDemp(){
}
private static StarvingDemp s=null;
public static StarvingDemp getInstance(){
if(null==s){
s=new StarvingDemp();
}else {
System.out.println("this ok");
}
return s;
}
}
