10.30 作业

package zuoye;

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 StaticDemo02 {

    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 zuoye;

class Single{

    private static Single instance = new Single();

    private Single() {

    }

    public static Single getInstance() {

        return instance;

    }

    public void print() {

        System.out.println("hello world!!!");

    }

}

public class SingleDemo {

    public static void main(String[] args) {

        Single s = null;

        s = Single.getInstance();

        s.print();

    }

}

 

package zuoye;
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 StaticDemo08 {
    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 zuoye;
class Person{
    private String name;
    private static int count;
    public Person() {
        count++;
        System.out.println("产生了" + count + "个实例化对象");
    }
    public String getInfo() {
        return "姓名:" + this.name;
    }
}
public class StaticDemo07 {
    public static void main(String[] args) {
        new Person();
        new Person();
        new Person();
        new Person();
        new Person();
    }
}

package zuoye;

public class StaticDemo06 {
    public static void main(String[] args) {
        for (int x=0;x<args.length;x++) {
            System.out.println(args[x] + "、");
        }
    }
}