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Several ways to instantiate a new instance
package com.fish.study.instance; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; /** * Created by Gan on 2017/7/1 0001. */ public class PersonBeanInstantiate { public static void main(String[] args){ PersonBean personBean = null; // Use new personBean = newBean(); // Use Constructor constructorBean(); // Use classForname(Reflect) fornameBean(); // Use Clone cloneBean(personBean); // Use Serializable serializableBean(personBean); } private static PersonBean newBean(){ PersonBean personBean = null; try { printStatus(InstantiateType.NEW, Status.BEGIN); personBean = new PersonBean(); printStatus(InstantiateType.NEW,Status.FINISHED); }catch (Exception e){ }finally { return personBean; } } private static void constructorBean() { try { printStatus(InstantiateType.CONSTRUR,Status.BEGIN); ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); Class clazz = classLoader.loadClass(PersonBean.class.getName()); Constructor constructor = clazz.getConstructors()[0]; constructor.newInstance(); printStatus(InstantiateType.CONSTRUR,Status.FINISHED); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } private static void serializableBean(PersonBean personBean) { try { File file = new File("PersonBean.out"); ObjectOutputStream oout = new ObjectOutputStream(new FileOutputStream(file)); oout.writeObject(personBean); oout.close(); printStatus(InstantiateType.SERIALIZE,Status.BEGIN); ObjectInputStream oin = new ObjectInputStream(new FileInputStream(file)); Object newPerson = oin.readObject(); oin.close(); printStatus(InstantiateType.SERIALIZE,Status.FINISHED); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } private static void cloneBean(PersonBean personBean) { try { printStatus(InstantiateType.CLONE,Status.BEGIN); PersonBean personBeanClone = (PersonBean) personBean.clone(); printStatus(InstantiateType.CLONE,Status.FINISHED); } catch (CloneNotSupportedException e) { e.printStackTrace(); } } private static void fornameBean() { try { printStatus(InstantiateType.FORNAME,Status.BEGIN); PersonBean personBean = (PersonBean)Class.forName(PersonBean.class.getName()).newInstance(); printStatus(InstantiateType.FORNAME,Status.FINISHED); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } } /** * Created by Administrator on 2017/7/1 0001. */ public static class PersonBean implements java.io.Serializable,Cloneable { public PersonBean(){ System.out.println("invoke constructor"); } @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getWeight() { return weight; } public void setWeight(String weight) { this.weight = weight; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } private String name; private String weight; private String address; } private static void printStatus(InstantiateType instantiateType,Status status){ System.out.println(String.format("Use %-9s to instatiate new instance..... %-9s .....",instantiateType.toString(),status.toString())); } private enum Status{ BEGIN,FINISHED; } private enum InstantiateType{ NEW,CONSTRUR,FORNAME,CLONE,SERIALIZE; } }
Several ways to instantiate a new instance
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