- 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;
- }
- }
来源: http://www.bubuko.com/infodetail-3117089.html