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10.30作业

时间:2017-11-06 14:54:31      阅读:126      评论:0      收藏:0      [点我收藏+]

标签:name   print   ==   修改   ges   img   []   static   pre   

//1
package lf; 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()); } }

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//2
package lf;
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();
    }

}

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//3
package lf;
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());
    }

}

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//4
package lf;
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();
    }
}

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//5
package lf;

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

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10.30作业

标签:name   print   ==   修改   ges   img   []   static   pre   

原文地址:http://www.cnblogs.com/linfenglf/p/7792731.html

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