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最新推荐文章于 2023-08-04 09:24:44 发布

dyb1296

最新推荐文章于 2023-08-04 09:24:44 发布

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分类专栏：经验

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本文通过具体的Java代码示例介绍了如何定义和使用类与对象，包括学生类的属性和方法，以及圆和圆柱的几何类，展示了构造函数、方法重载及继承等概念。

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import java.util.*;
class Student{
    int sNO;
    String sName;;
    char sSex;
    char sAge;
    double sJava;
    Student(int a,String b,char c,char d,double e){
        sNO=a;
        sName=b;
        sSex=c;
        sAge=d;
        sJava=e;
    }
    double[] q=new double[5];
    Student(){}
    int getNo(){
        return sNO;
    }
    String getName(){
        return sName;
    }
    char getSex(){
        return sSex;
    }
    double getJava(){
        return sJava;
    }
void print(double s){
    System.out.println("平均成绩是"+s);
}
void print1(double s){
    System.out.println("最高时"+s);
}
void print2(double s){
    System.out.println("最低是"+s);
}
double come(double f,double g,double h,double j,double k){

    q[0]=f;
        q[1]=g;
            q[2]=h;
                q[3]=j;
                    q[4]=k;
                    return 0;
    }


}
class ch8{
    public static void main(String[] args){

        Student s=new Student();
        Student s1=new Student(14156,"lisi",'v','r',89);
        Student s2=new Student(14556,"lisan",'r','t',90);
        s.print((s1.sJava+s2.sJava)/2);

        Student s3=new Student(14556,"lisan",'r','t',35);
        Student s4=new Student(14556,"lisan",'r','t',69);
        Student s5=new Student(14556,"lisan",'r','t',92);
        Student s6=new Student(14556,"lisan",'r','t',87);
        Student s7=new Student(14556,"lisan",'r','t',73);
        s.come(s3.sJava,s4.sJava,s5.sJava,s6.sJava,s7.sJava);

        Arrays.sort(s.q);
        s.print2(+s.q[0]);
        s.print1(+s.q[4]);

    }
}


import java.util.*;
class Circle{
    double radius;
    Circle(){
        radius=0;
    }
    Circle(double r){   
        radius=r;
    }

    double getArea(double r){
        return Math.PI*radius*radius;
    }
double getPerimeter(double r){
        return 2*Math.PI*radius;
    }
    void disp(){
        System.out.println("半径是"+radius);
        System.out.println("周长是"+getPerimeter(radius));
        System.out.println("面积是"+getArea(radius));
    }
}
class Cylinder extends Circle{
    double height;
    Cylinder(double r,double h){
        super(r);
        this.height=h;
    }
    double getVol(){
        return Math.PI*this.radius*this.radius*height;
    }
    void dispVol(){
        System.out.println("体积是"+getVol());
    }
}
class ch5{
    public static void main(String[] args){
         Scanner input=new Scanner(System.in);
        Circle R= new Circle(input.nextDouble());
        R.disp();
    Cylinder p=new Cylinder(R.radius,input.nextDouble());
    p.getVol();
    p.dispVol();

    }
}