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  • java练习---11

    package cn.lyhh;
    class Person{
        private String name;
        private int age;
        static String city =  "A城";
        public Person(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 L {
        public static void main(String[] args) {
            Person per1 = new Person("张三",30);
            Person per2 = new Person("李四",31);
            Person per3 = new Person("王五",30);
            System.out.println("======修改信息之前======");
            System.out.println(per1.getInfo());
            System.out.println(per2.getInfo());
            System.out.println(per3.getInfo());
            System.out.println("======修改信息之后======");
            Person.city = "B城";
            System.out.println(per1.getInfo());
            System.out.println(per2.getInfo());
            System.out.println(per3.getInfo());
            
        }
    
    }
    
    
    package cn.lyhh;
    class La{
        private static La instance = new La();
        private La() {
        }
        public static La getInstance() {
            return instance;
        }
        public void print() {
            System.out.println("hello world!!!");
        }
    }
    public class L {
        public static void main(String[] args) {
            La s = null;
            s = La.getInstance();
            s.print();
        }
    
    }
    
    
    
     
    package cn.lyh;
    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 Ly{
        public static void main(String[] args) {
            System.out.println(new Person().getInfo());
            System.out.println(new Person("A").getInfo());
            System.out.println(new Person("B").getInfo());
            System.out.println(new Person().getInfo());
        }
    
    }
    package cn.lyh;
    class Person{
        private String name;
        private static int count;
        public Person() {
            count++;
            System.out.println("产生了" + count + "个实例化");
        }
        public String getInfo() {
            return "姓名:" + this.name;
        }
    }
    public class Y {
        public static void main(String[] args) {
            new Person();
            new Person();
            new Person();
            new Person();
            new Person();
        }
    }
    package cn.lyh;
    
    public class LYH {
        public static void main(String[] args) {
            for (int x=0;x<args.length;x++) {
                System.out.println(args[x] + "、");
            }
        }
    }

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  • 原文地址:https://www.cnblogs.com/xiaoluohao/p/7788662.html
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