The second process of assessment

Code cloud Address: https://gitee.com/axsj/codes/fzdtqmjv29xr853aueyib86;

First question:

Use knowledge points:

Person[] Person

for (i=n-1;i>=0;i--) {
System.out.println (Persons[i].tostring ());
}

Basic classes and methods

Code:

Import Java.util.Scanner;
Class person{
private String name;
private int age;
private Boolean gender;
private int id;
Person () {
System.out.println ("This is constructor");
System.out.printf ("%s,%d,%b,%d\n", Name,age,gender,id);
}
Public person (String A,int B,boolean c) {
Name=a;
Age=b;
Gender=c;
}
Public String toString () {
String Classname=this.getclass (). GetName ();
Return (classname+ "[name=" +name+ ", age=" +age+ ", gender=" +gender+ ", id=" +id+ "]");
}
}
public class main{
public static void Main (string[] args) {
Scanner read=new Scanner (system.in);
int N=read.nextint ();
int i;
Person[] PersonS;
Persons=new Person[n];

Read.nextline ();
for (i=0;i<n;i++) {
String Readline=read.nextline ();
String data[]=readline.split ("");
Persons[i]=new person (data[0],integer.valueof (data[1]), Boolean.parseboolean (data[2]));
}
for (i=n-1;i>=0;i--) {
System.out.println (Persons[i].tostring ());
}
Person Person1=new person ();
System.out.println (Person1.tostring ());
}

The second question:

Use knowledge points:

Classes and methods.

Code:

Import Java.util.Scanner;
public class Main {
public static void Main (string[] args) {
Scanner w = new Scanner (system.in);
int a,b,c,d,e;
A=w.nextint ();
B=w.nextint ();
C=w.nextint ();
D=w.nextint ();
E=w.nextint ();
RR rr = new RR ();
Double dd = rr.fun (a,b,c,d,e);
System.out.printf ("%.2f", DD);
W.close ();
}
}
Class rr{
Double Z;
public double Fun (int a,int b,int c,int d,int e) {
z = (a+b+c+d+e)/5;
return z;
}
}

Operation Result:

Question three:

Use knowledge points:

Simple classes and methods

constructor function

Code:

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);

System.out.println ("Son ' s Constructor without parameter"); }

public void Method () {

System.out.println ("Son ' s Method ()");

Super.method (); }

}

Operation Result:

Question Fourth:

Use of knowledge points:

Java.util.* and Java.main. *

Establish class definition properties and calculate distances between two points

Code:

Import java.util.*;
Import java.math.*;
public class main{
public static void Main (string[] args) {
Scanner input=new Scanner (system.in);
Double x1=input.nextdouble ();
Double y1=input.nextdouble ();
Double x2=input.nextdouble ();
Double y2=input.nextdouble ();
System.out.println (String.Format ("%.2f", Math.sqrt ((x1-x2) * (X1-X2) + (y1-y2) * (y1-y2)));
}
}

Operation Result:

Learning content	Number of lines of code	Blog words
Constructing methods and objects	45	200
Subclasses and inheritance, overloading	35	400
The second process of assessment	121	950

The second process of assessment