【shape】

package se;
import java.util.Scanner;
import java.util.*;

public class sdf {

    public static class Shape extends Object {
        protected double area;
        protected int c;
        public Shape(double s,int c2)
        {
            area=s;
            c=c2;
        }
        public double getarea()
        {
            return area;
        }
        public int getcc()
        {
            return c;
        }
    }
    public static class TwoDimensional extends Shape {
        protected int x;
        protected int y;
        public TwoDimensional(double s,int cc,int x,int y)
        {
            super(s,cc);
            this.x=x;
            this.y=y;
        }
        public int getx()
        {
            return x;
        }
        public int gety()
        {
            return y;
        }
    }
    public static class ThreeDimensional extends Shape {
        protected int x,y,z;
        public ThreeDimensional(double s,int cc,int x,int y,int z)
        {
            super(s,cc);
            this.x=x;
            this.y=y;
            this.z=z;
        }
        public int getx()
        {
            return x;
        }
        public int gety()
        {
            return y;
        }
        public int getz()
        {
            return z;
        }
    }
    public static class rect extends TwoDimensional {
        private int a,b;
        public rect(int a,int b)
        {
            super(0,0,0,0);
            this.a=a;
            this.b=b;
        }
        @Override
        public double getarea()
        {
            return area=a*b;
        }
        @Override
        public int getcc()
        {
            return c=2*(a+b);
        }
    }
    public static class tri extends TwoDimensional {
        public int h,d;
        public int a,b,e;
        public tri(int h,int d,int a,int b,int e)
        {
            super(0,0,0,0);
            this.h=h;
            this.d=d;
            this.a=a;
            this.b=b;
            this.e=e;
        }
        @Override
        public double getarea()
        {
            return area=h*d/2;
        }
        @Override
        public int getcc()
        {
            return c=a+b+e;
        }
        public void setx(int x)
        {
            this.x=x;
        }
        public void sety(int y)
        {
            this.y=y;
        }
    }

    public static class circle extends TwoDimensional {
        public double r;
        public double ci;
        public circle(double r)
        {
            super(0,0,0,0);
            this.r = r;
        }
        @Override
        public double getarea()
        {
            return area=r*r*3.14;
        }

        public double getc()
        {
            return ci=r*2*3.14;
        }
    }
    public static class cube extends ThreeDimensional {
        private int  a,b,h;
        public cube(int a,int b,int h)
        {
            super(0,0,0,0,0);
            this.a=a;
            this.b=b;
            this.h=h;
        }
        @Override
        public double getarea()
        {
            return area=a*b*2+a*h*2+b*h*2;
        }
        public double getc2()
        {
            return c=4*(a+b+h);
        }
        public void setx(int x)
        {
            this.x=x;
        }
        public void sety(int y)
        {
            this.y=y;
        }
        public void setz(int z)
        {
            this.z=z;
        }
    }
    public static void main(String arg[])
    {
        tri s= new tri(3,4,3,4,5);
        double area=s.getarea();
        int c=s.getcc();
        System.out.println("Triangle ");
        System.out.println("the Area is "+area);
        System.out.println("the circumference is "+c);
        System.out.println("the position of tri is (x,y) = ("+s.x+","+s.y+")");
        s.setx(10);
        s.sety(20);
        System.out.println("the position of tri is (x,y) = ("+s.x+","+s.y+")");
        System.out.println("Rectangle ");
        rect r=new rect(10,15);
        double rarea=r.getarea();
        int rc=r.getcc();
        System.out.println("the Area is "+rarea);
        System.out.println("the circumference is "+rc);
        System.out.println("Cube ");
        cube t=new cube(3,5,7);
        System.out.println("the Area is "+t.getarea());
        System.out.println("the circumference is "+t.getc2());


    }


}

【fraction】

package se;
import java.util.Scanner;
public class fraction {
    public static class frac{
        private int a,b;

        public frac()
        {
            int a=1;
            int b=1;
        }
        public frac(int a,int b)
        {
            this.a=a;
            this.b=b;
            if(this.b==0)
            {
                System.out.println("error! the denominator can not be 0!\n");
            }
        }
        public void add(int c,int d)
        {
            this.a=a+c;
            this.b=b+d;
        }
        public void sub(int c,int d)
        {
            this.a=a-c;
            this.b=b-d;
            if(this.b==0)
            {
                System.out.println("error! the denominator can not be 0!\n");
            }
        }
        public void mul(int c,int d)
        {
            this.a=a*c;
            this.b=b*d;
            if(this.b==0)
            {
                System.out.println("error! the denominator can not be 0!\n");
            }
        }
        public void div(int c,int d)
        {
            if(d==0)
            {
                System.out.println("error! the denominator can not be 0!\n");
                return;
            }
            this.a=a/c;
            this.b=b/d;
            if(this.b==0)
            {
                System.out.println("error! the denominator can not be 0!\n");
            }
        }
        public int gcd(int a,int b)
        {
            if(b==0)return a;
            else return gcd(b,a%b);
        }
        public void pr()
        {
            int d=gcd(a,b);
            System.out.printf("%d/%d\n",a/d,b/d);
        }
        public void pr2()
        {
            int d=gcd(a,b);
            double kk=(a/d*1.0) / (b/d*1.0);
            System.out.println(kk);
        }

    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        frac a = new frac(45,15);
        System.out.println("output orignal fraction in the form a/b");
        a.pr();
        System.out.println("output in floating-point format");
        a.pr2();
        System.out.println(" Add two Rational numbers");
        a.add(4, 3);
        System.out.println("output fraction in the form a/b");
        a.pr();
        System.out.println("output in floating-point format");
        a.pr2();
        a.sub(4, 3);
        System.out.println("output fraction in the form a/b");
        a.pr();
        System.out.println("output in floating-point format");
        a.pr2();
        a.mul(2, 10);
        System.out.println("output fraction in the form a/b");
        a.pr();
        System.out.println("output in floating-point format");
        a.pr2();
        a.div(3, 5);
        System.out.println("output fraction in the form a/b");
        a.pr();
        System.out.println("output in floating-point format");
        a.pr2();
        frac b=new frac();
        b.add(1, 3);
        System.out.println("output fraction in the form a/b");
        b.pr();
        System.out.println("output in floating-point format");
        b.pr2();
    }
}

【student】

package se;

public class student {
    public static class Student {
        protected String name;
        protected int age;
        public Student(String s,int age)
        {
            name=s;
            this.age=age;
        }
        public String getname()
        {
            return name;
        }
        public int getage()
        {
            return age;
        }
    }
    public static class GraduatedStudent extends Student {
        private int graduateyear;
        private String Organization;
        public GraduatedStudent(String n,int a,int y,String s)
        {
            super(n,a);
            graduateyear=y;
            Organization = s;
        }
        public int getyear()
        {
            return graduateyear;
        }
        public String getorg()
        {
            return Organization;
        }
        public String toString()
        {
            return String.format("%s:%s %s:%d %s:%s %s:%d","name",super.name,"age",super.age,"Organization",Organization,"graduateyear",graduateyear);
        }
    }
    public static class underGraduateStudent extends Student {
        private int Grade;
        private String major;
        public underGraduateStudent(String n,int a,int y,String s)
        {
            super(n,a);
            Grade=y;
            major = s;
        }
        public int getGrade()
        {
            return Grade;
        }
        public String getmajor()
        {
            return major;
        }
        public String toString()
        {
            return String.format("%s:%s %s:%d %s:%s %s:%d","name",super.name,"age",super.age,"major",major,"Grade",Grade);
        }
    }
    public static void main(String[] args) {

        GraduatedStudent a=new GraduatedStudent("cc",28,2017,"中国银行");
        System.out.printf(a.toString());
        System.out.println();
        underGraduateStudent b =new underGraduateStudent("kk",20,3,"计算机科学与技术");

        System.out.printf(b.toString());
    }

}