java类和对象基础题2

import java.util.*;
public class Sanjiao {
    private double a,b,c;
    private double n=a+b+c;
    public Sanjiao(double a, double b, double c) {
        super();
        this.a = a;
        this.b = b;
        this.c = c;
        
    }

    public double getA() {
        return a;
    }

    public void setA(double a) {
        this.a = a;
    }

    public double getB() {
        return b;
    }

    public void setB(double b) {
        this.b = b;
    }

    public double getC() {
        return c;
    }

    public void setC(double c) {
        this.c = c;
    }
    
    double doZhouChang()
    {
        if(a+b>c&&a+c>b&&b+c>a&&a-b<c&&b-c<a&&a-c<b&&a!=0&&b!=0&&c!=0)
        {
            
            return this.n=a+b+c;
        }
        else
        {
            System.out.println("这不是一个三角形");
        }
        return this.n;
    }
    
        
    
    public static void main(String[] args) {
        Sanjiao san=new Sanjiao(3,4,5);
        Scanner sc=new Scanner(System.in);
        System.out.println("输入第一条边长：");
        san.a=sc.nextDouble();
        System.out.println("输入第二条边长：");
        san.b=sc.nextDouble();
        System.out.println("输入第三条边长：");
        san.c=sc.nextDouble();
        System.out.println("三角形的周长是"+san.doZhouChang());
        
        
    }

}

public class People {
    private String name;
    private int age;
    private String sex;
    private double high;
    public People(String name, int age, String sex, double high) {
        super();
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.high = high;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    void Say()
    {
        System.out.println(this.name+"说：你好");
    }
    public int doAddition(int a,int b)
    {
        return a+b;
    }
    public static void main(String[]args)
    {
        People peo=new People("张三",18,"男",1.80);
        peo.Say();
        System.out.println("23+45="+peo.doAddition(23, 45));
        peo.setName("李四");
        System.out.println("改名叫："+peo.name);
        
        System.out.println(peo.toString());
    }
    
    @Override
    public String toString() {
        return "People [name=" + name + ", age=" + age + ", sex=" + sex + ", high=" + high + "]";
    }


}

public class Car {
    private String chepai;
    private int chesu;
    private double zaizhong;
    public int getJiaSu(int n)
    {
        
        return this.chesu+=n;
    }
    public int getJianSu(int n)
    {
        return this.chesu-=n;
    }
    public Car()
    {
        chepai="XX1234";
        chesu=100;
        zaizhong=100;
    }
    public Car(String chepai, int chesu, double zaizhong) {
        super();
        this.chepai = chepai;
        this.chesu = chesu;
        this.zaizhong = zaizhong;
    }

    public double getZaizhong() {
        return zaizhong;
    }
    public void setZaizhong(double zaizhong) {
        this.zaizhong = zaizhong;
    }
    public int getChesu() {
        return chesu;
    }
    public void setChesu(int chesu) {
        this.chesu = chesu;
    }
    public String getChepai() {
        return chepai;
    }
    public void setChepai(String chepai) {
        this.chepai = chepai;
    }
    
    public static void main(String[]args)
    {
        
        Car car1=new Car();
        car1.chepai="辽A9752";
        
        System.out.println("车牌为"+car1.getChepai()+"载重"+car1.getZaizhong()+"车速"+car1.getJiaSu(15));
        Car car2=new Car("辽B5086",150,200);
        System.out.println("车牌为"+car2.getChepai()+"载重"+car2.getZaizhong()+"车速"+car2.getJianSu(10));
        System.out.println(car1.toString());
        System.out.println(car2.toString());
    }
    @Override
    public String toString() {
        return "Car [chepai=" + chepai + ", chesu=" + chesu + ", zaizhong=" + zaizhong + "]";
    }
    
    

}

public class Point {
    private int x;
    private int y;
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    public Point(int x, int y) {
        super();
        this.x = x;
        this.y = y;
    }
    

}

public class A {

    public static void main(String[] args) {
        Point p=new Point(3,2);
        System.out.println(p.getX());
        System.out.println(p.getY());
        p.setX(5);
        System.out.println(p.getX());
        p.setY(8);
        System.out.println(p.getY());
        
    }

}

public class ChongZai {
    public void print(int a,int b)
    {
        System.out.println(a-b);
    }
    public void print(double a,double b)
    {
        System.out.println(a-b);
    }
    public void print(int a,int b,int c)
    {
        System.out.println(a-b-c);
    }
    public static void main (String[]args)
    {
        ChongZai n=new ChongZai();
        n.print(5, 6);
        n.print(3.2, 5.6);
        n.print(98, 32, 10);
    }

}