JAVA类与对象相关编程

追问：public class Number,public class test 有2个啊  应该只一个公共类把

答案：
public class Number {
    private int n1;
    private int n2;
    public Number(){}
    public Number(int n1, int n2) {
        this.n1 = n1;
        this.n2 = n2;
    }
    public int getN1() {
        return n1;
    }
    public void setN1(int n1) {
        this.n1 = n1;
    }
    public int getN2() {
        return n2;
    }
    public void setN2(int n2) {
        this.n2 = n2;
    }
    
    /**
     * 加方法
     * @return
     */
    public static int addition(Number n){
        int i=0;
        i=n.getN1()+n.getN2();
        return i;
    }
    
    public static int subtration(Number n){
        int i=0;
        i=n.getN1()-n.getN2();
        return i;
    }
    public static int multiplication(Number n){
        int i=0;
        i=n.getN1()*n.getN2();
        return i;
    }
    public static double division(Number n){
        double i=0;
        if(n.getN1()!=0){
            i=n.getN1()/n.getN2();
        }else{
            System.out.println("被除数不可以为0");
        }
        return i;
    }
    
    
    

}







public class test {
 public static void main(String[] args) {
    Number n=new Number(10,5);
    System.out.println("加法："+Number.addition(n));
    System.out.println("减法："+Number.subtration(n));
    System.out.println("乘法："+Number.multiplication(n));
    System.out.println("除法："+Number.division(n));
    
    
}
}

public class Phone {  private String phoneCode;


 //电话号码  private String answerPhone;

  //接电话
private String call;




//打电话
 public Phone() {
super();  }
 public Phone(String phoneCode, String answerPhone, String call) {
super();
this.phoneCode = phoneCode;
this.answerPhone = answerPhone;
this.call = call;  }
 public String getPhoneCode() {
return phoneCode;  }  public void setPhoneCode(String phoneCode) {
this.phoneCode = phoneCode;  }  public String getAnswerPhone() {
return answerPhone;  }  public void setAnswerPhone(String answerPhone) {
this.answerPhone = answerPhone;  }  public String getCall() {
return call;  }  public void setCall(String call) {
this.call = call;  }
 /*
* 输出电话类型
*/  public void phoneType(){
System.out.println("这是电话");  } }

 /*  * 定义接口  */ public interface Moveable {  public void way();



 //移动方式 }  public class Mobilephone extends Phone implements Moveable {
  private String mp3;


 //带mp3
 public Mobilephone() {
super();  }
 public Mobilephone(String phoneCode, String answerPhone, String call,String mp3)  {
super(phoneCode,answerPhone,call);


//调用父类代参的构造方法
this.mp3 = mp3;  }
 public String getMp3() {
return mp3;  }
 public void setMp3(String mp3) {
this.mp3 = mp3;  }

 /*
* 实现Moveable 接口中的方法
*/  public void way() {
System.out.println("这是可移动的Mobilephone");  }
 /*
* 重写Phone 父类中的方法
*/  public void phoneType(){
System.out.println("这是移动电话");  } }
  public class Fixedphone extends Phone {  private String leaveWord;



//留言
 public Fixedphone() {
super();  }
 public Fixedphone(String leaveWord) {
super();






 //调用父类无参的构造方法
this.leaveWord = leaveWord;  }
 /*
* 重写Phone 父类中的方法
*/  public void phoneType(){
System.out.println("这是固定电话");  } }
  public class Cordlessphone extends Fixedphone {  private String dect;


 //数字无绳电话
  public Cordlessphone() {
super();  }
 public Cordlessphone(String dect) {
super();
this.dect = dect;  }
 public String getDect() {
return dect;  }
 public void setDect(String dect) {
this.dect = dect;  }
 /*
* 重写父类Fixedphone 中的方法
*/  public void phoneType(){
System.out.println("这是无绳电话");  } }
  public class TestPhone {
 public static void main(String[] args) {
Phone[] phones = new Phone[5];
Phone phone1 = new Phone("4213264","使用phone1接电话","使用phone1打电话");
Phone phone2 = new Phone("3413436","使用phone1接电话","使用phone1打电话");
Phone mobilephone = new Mobilephone("13254742215","使用mobilephone接电话","使用mobilephone打电话","收听mp3");
Phone fixedphone = new Fixedphone("这是固定电话fixedphone");
Phone cordlessphone = new Cordlessphone("这是无绳电话cordlessphone");

phones[0] = phone1;

phones[1] = phone2;

phones[2] = mobilephone;

phones[3] = fixedphone;

phones[4] = cordlessphone;

for(int i=0;i<phones.length; i++){

 System.out.println("这是电话的一个变量值:"+phones[i].getCall());

 phones[i].phoneType();

}  } }

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