标签：this practice java 对象 space 实例化 out ack static
package practice;
class Person { private String name; private static int count; public Person(){ count++; this.name="NONAME - " + count; } public Person(String name){ this.name=name; } public String getInfo(){ return "姓名:"+this.name; } } public class DemoOutput { public static void main(String args[]) { System.out.println(newPerson().getInfo()); System.out.println(newPerson("A").getInfo()); System.out.println(newPerson("B").getInfo()); System.out.println(newPerson().getInfo()); }};
package practice;
class Person1{ private String name; private static int count; public Person1(){ count++; System.out.println("产生了"+count+"个实例化对象。"); } public String getInfo(){ return "姓名:"+this.name; }};public class DemoOutputA { public static void main(String args[]){ new Person1(); new Person1(); new Person1(); new Person1(); new Person1(); }};
package practice;
class Person2{ private String name; private int age; static String city="A城"; public Person2(String name,int age){ this.name=name; this.age=age; } public String getInfo(){ return"姓名:"+this.name+",年龄:"+this.age+",城市:"+city; }};public class DemoOutputB { public static void main(String args[]){ Person2 per1=new Person2("张三",30); Person2 per2=new Person2("李四",31); Person2 per3=new Person2("王五",30); System.out.println("==========信息修改之前=========="); System.out.println(per1.getInfo()); System.out.println(per2.getInfo()); System.out.println(per3.getInfo()); System.out.println("==========信息修改之前=========="); Person2.city="B城"; System.out.println(per1.getInfo()); System.out.println(per2.getInfo()); System.out.println(per3.getInfo()); }};
package practice;
class Single{ private static Single instance=newSingle(); private Single(){//将构造方法私有化 } public static Single getInstance(){ return instance; } public void print(){ System.out.println("hello world!!!"); }};public class DemoOutputC { public static void main(String args[]){ Single s=null; s=Single.getInstance(); s.print(); }}
标签：this practice java 对象 space 实例化 out ack static
原文地址：http://www.cnblogs.com/kally004/p/7792824.html
