64216F77-06E0-4505-8EEC-2748542DAAF8.png

public class Person
{
    String name;
    int age;
    Person()
    {

    }
    Person(String name,int age)
    {
        this.name=name;
        this.age=age;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }
    public void showMsg()
    {
        System.out.println("姓名："+name+",年齡"+age);
    }
}

public class Teacher1 extends Person
{
    String xk;//學(xué)科
    Teacher1()  //無(wú)參構(gòu)造方法
    {

    }
    Teacher1(String xk)   //有參構(gòu)造方法
    {
        this.xk=xk;
    }

    public String getXk()
    {
        return xk;
    }

    public void setXk(String xk)
    {
        this.xk = xk;
    }
    public void jk()     //講課方法
    {
        System.out.println(name+"老師，講授"+xk+"課");
    }
}

public class Student1 extends Person
{
    int score;//分?jǐn)?shù)
    Student1()
    {

    }
    Student1(int score)
    {
        this.score=score;
    }

    public int getScore()
    {
        return score;
    }

    public void setScore(int score)
    {
        this.score = score;
    }
    public void ks()  //考試方法
    {
        System.out.println(name+"同學(xué),考試得了"+score+"分");
    }
}

public class TestTeacherStudent
{
    public static void main(String[] args)
    {
        Teacher1 teacher1 = new Teacher1();
        teacher1.name="王小平";
        teacher1.xk="Java";
        teacher1.jk();
        Student1 student1 = new Student1();
        student1.name="李小樂(lè)";
        student1.score=90;
        student1.ks();
    }
}

批注 2020-07-22 141300.png

97F7A451-5BFE-4b64-9D19-E14875A73ED8.png

public class Auto
{
    private String brands;//品牌
    private double length;    //車長(zhǎng)
    private double price;   //價(jià)格
    public Auto()
    {

    }
    public Auto(String brands,double length,double price)
    {
        this.brands=brands;
        this.length=length;
        this.price=price;
    }

    public String getBrands()
    {
        return brands;
    }

    public void setBrands(String brands)
    {
        this.brands = brands;
    }

    public double getLength()
    {
        return length;
    }

    public void setLength(double length)
    {
        this.length = length;
    }

    public double getPrice()
    {
        return price;
    }

    public void setPrice(double price)
    {
        this.price = price;
    }

    public void showcar()
    {
        System.out.println("車型："+brands);
        System.out.println("\t價(jià)格："+price);
        System.out.println("\t車長(zhǎng)："+length);
    }
}

public class SUV extends Auto
{
    private int miniLength=4295;
    private int midLength=5070;
    public SUV(double length,double price)
    {
        super("SUV",length,price);
    }
    public boolean smallSUV()
    {
        return getLength()<=miniLength;
    }
    public boolean largeSUV()
    {
        return getLength()>midLength;
    }
    public boolean midSUV()
    {
        return getLength()>miniLength&&getLength()<=midLength;
    }
}

import java.util.ArrayList;

public class TestAutoSUV
{
    public static void main(String[] args)
    {
//        SUV[] suv=new SUV[3];
        SUV suv1 = new SUV(5079,750000);//創(chuàng)建對(duì)象
        SUV suv2 = new SUV(4813,760000);
        SUV suv3 = new SUV(4526,770000);
        ArrayList<SUV> list=new ArrayList<>();//對(duì)象添加到集合中
        list.add(suv1);
        list.add(suv2);
        list.add(suv3);                 //遍歷集合宰翅，查詢中型SUV
        for (int i = 0; i <list.size(); i++) {
            SUV suv=list.get(i);
            if(suv.midSUV())
            {
                suv.showcar();
            }
        }
    }
}

批注 2020-07-22 192958.png