第二次过程性考核

Posted 2021-01-12 hlxwzyyyyzyq

7-5 jmu-Java-03面向对象基础-01-构造函数与toString

import java.util.Scanner;

class Person{  private String name = null;  private int age = 0;  private boolean gender = false;  private int id = 0;    public Person() {   System.out.println("This is constructor");   System.out.println(name+","+age+","+gender+","+id);   System.out.println("Person [name="+name+", age="+age+", gender="+gender+", id="+id+"]");  }    public Person(String n, int a, boolean g) {   this.name = n;   this.age = a;   this.gender = g;  }    public String toString() {   System.out.println("Person [name="+this.name

+", age="+this.age+", gender="+this.gender+", id="+0+"]");   return name;  } }

public class Main {

 public static void main(String[] args) {   // TODO Auto-generated method stub   Scanner reader = new Scanner(System.in

);   int number = reader.nextInt();   Person[] per = new Person[number]; //初始化对象数组   for(int i=0; i<per.length; i++) { //通过循环从键盘输入    String name = reader.next();    int age = reader.nextInt();    boolean genter = reader.nextBoolean();    per[i] = new Person(name,age,genter);   }   for(int x=per.length-1; x>=0;x--){ //通过循环从后往前输出    per[x].toString();   }      per.toString();   @SuppressWarnings("unused")   Person s = new Person();  }｝

7-6 集体评分

import java.util.Scanner;
import java.util.Arrays; 
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int[] grade = new int[5];  //声明数组
        for(int i=0; i<grade.length; i++){
      grade[i] = in.nextInt();
  }       
        RR rr = new RT(grade);
        double dd = rr.mark();
        System.out.printf("%.2f",dd);
    }
}
abstract class RR{
 int[] grade;
 public RR(int[] grade){
  this.grade = grade;
 }
 public abstract double mark();
}
class RT extends RR{
 RT(int[] grade){
  super(grade); //调用父类有参构造函数
 }
 public double mark(){
  Arrays.sort(grade);   //将数组 升序排序
  return (double)(grade[1]+grade[2]+grade[3])/3; //求平均值
 }
}

7-7 程序填空题3

public class Main {
    public static void main(String[] args) {
        Son son = new Son();
        son.method();
    }
}
class Parent {
    Parent() {
        System.out.println("Parent‘s Constructor without parameter");
    }
    Parent(boolean b) {
        System.out.println("Parent‘s Constructor with a boolean parameter");
    }
    public void method() {
        System.out.println("Parent‘s method()");
    }
}
class Son extends Parent {
    Son() {
        super(true);    //调用父类有参构造 ()内true或false都可以
        System.out.println("Son‘s Constructor without parameter");
    }
    public void method() {
        System.out.println("Son‘s method()");
        super.method();
    }
}

7-8 求两点之间距离

import java.util.Scanner;
class Point{
    double x;    //x坐标
    double y;    //y坐标
    Point(double x,double y){
        this.x=x;
        this.y=y;
    }
    public double distance(Point a){
        //和另一个点的距离
        //math.abs 绝对值,sqrt 根号,pow 幂
        return Math.abs(Math.sqrt(Math.pow((this.x-a.x),2)+Math.pow((this.y-a.y),2)));
    }
}
public class Main{
    public static void main(String[] args){
        Scanner read=new Scanner(System.in); //题目只输入两个点，所以未用for循环
        String readLine=read.nextLine();    //获取控制台一行 赋值给字符串readLine
        String[] data=readLine.split(" ");    //将字符串readLine以空格为分隔 赋值给字符串组data
        Point pointA=new Point(Integer.valueOf(data[0]),Integer.valueOf(data[1]));    //创建对象 点A
        readLine=read.nextLine();
        data=readLine.split(" ");    //之前有声明 所以不用String
        Point pointB=new Point(Integer.valueOf(data[0]),Integer.valueOf(data[1]));    //创建对象 点B
        System.out.printf("%.2f",pointA.distance(pointB));    //保留两位输出
    }
}

学习内容	代码行	博客字
类与对象，子类和继承	132	850

 

 

总结：上课溜号 平时练习少 导致过程性考核的不会  以后课堂练习时间要充分利用好

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