使用Java按年龄对用户进行分组
我有一个不同年龄的1000000用户列表,我想用Java进行搜索,根据年龄范围只输出组中的人数。 例如:使用Java按年龄对用户进行分组,java,Java,我有一个不同年龄的1000000用户列表,我想用Java进行搜索,根据年龄范围只输出组中的人数。 例如: Age Group Age Range 1 6 years old or younger 2 7 to 18 years old 3 19 to 26 years old 4
Age Group Age Range
1 6 years old or younger
2 7 to 18 years old
3 19 to 26 years old
4 27 to 49 years old
5 50 to 64 years old
6 65 to 79 years old
7 80 years old or older
如果我输入特定的年龄组,我希望我的输出显示属于该年龄组的人数。即:
If I enter 1
输出应为:
**** users found (total number of users that falls within the
age range 6 years old or younger)
任何类型的数据结构都是完美的
这就是我到目前为止所做的:
/**
A template used to read data lines into java.util.ArrayList data structure.
Input file: pjData.csv
Input file must be saved under the same directory/folder as the program.
Each line contains 5 fields, separated by commas. For example,
959695171, 64, AZ, M, 1
355480298, 101, TN, F, 1
**/
import java.io.*;
import java.util.*;
public class pj3Template2
{
public static void main(String args[])
{
String line;
String id, s, g;
Integer a, sa;
StringTokenizer st;
HealthDS2 records = new HealthDS2();
try {
FileReader f = new FileReader("pjData.csv");
BufferedReader in = new BufferedReader(f);
while ((line = in.readLine()) != null)
{
st = new StringTokenizer(line, ",");
id = st.nextToken(",").trim();
a = Integer.valueOf(st.nextToken(",").trim());
s = st.nextToken(",").trim().toUpperCase();
g = st.nextToken(",").trim().toUpperCase();
sa = Integer.valueOf(st.nextToken().trim());
records.add(new HealthRec2(id, a, s, g, sa));
} // loop until the end of file
in.close();
f.close();
}
catch (Exception e) { e.printStackTrace(); };
System.out.println(records.getSize() + " records processed.");
// Search by age
System.out.print("Enter 1-character age abbreviation to search: ");
String ui;
Scanner input = new Scanner(System.in);
ui = input.next().trim();
System.out.println("Searching all records in: " + ui);
ArrayList <HealthRec2> al = records.searchByAge(Integer.valueOf(ui.trim()));
System.out.println(al.size() + " records found.");
}
}
/**
Data class Sample records:
5501986, 31, WV, F, 1
1539057187, 5, UT, M, 2
**/
class HealthRec2
{
String ID;
Integer age;
String state;
String gender;
int status;
public HealthRec2() { }
public HealthRec2(String i, Integer a, String s, String g, int sa)
{ ID = i; age = a; state = s; gender = g; status = sa; }
// Reader methods
public String getID() { return ID; }
public Integer getAge() { return age; }
public String getState() { return state; }
public String getGender() { return gender; }
public int getStatus() { return status; }
// Writer methods
public void setAge(Integer a) { age = a; }
public void setState(String s) { state = s; }
public void setGender(String g) { gender = g; }
public void setStatus(int sa) { status = sa; }
public String toString()
{ return ID + " " + age + " " + state + " " + gender + " " + status; }
} // HealthRec
// Data structure used to implement the requirement
// This implementation uses java.util.ArrayList
class HealthDS2
{
ArrayList <HealthRec2> rec;
public HealthDS2()
{ rec = new ArrayList <HealthRec2>(); }
public HealthDS2(HealthRec2 r)
{
rec = new ArrayList <HealthRec2>();
rec.add(r);
}
public int getSize() { return rec.size(); }
public void add(HealthRec2 r) { rec.add(r); }
// Search by age
// No data validation is needed -- assuming the 1-character age is valid
// Returns an ArrayList of records
public ArrayList <HealthRec2> searchByAge(Integer a)
{
ArrayList <HealthRec2> temp = new ArrayList <HealthRec2>();
for (int k=0; k < rec.size(); ++k)
{
if (rec.get(k).getAge().equals(a))
temp.add(rec.get(k));
}
return temp;
} // searchByAge
} // HealthDS
/**
用于将数据行读入java.util.ArrayList数据结构的模板。
输入文件:pjData.csv
输入文件必须保存在与程序相同的目录/文件夹下。
每行包含5个字段,用逗号分隔。例如
959695171,64,亚利桑那州,M,1
355480298101,田纳西州,F,1
**/
导入java.io.*;
导入java.util.*;
公共类PJ3模板2
{
公共静态void main(字符串参数[])
{
弦线;
字符串id,s,g;
整数a,sa;
StringTokenizer st;
HealthDS2记录=新的HealthDS2();
试一试{
FileReader f=新的FileReader(“pjData.csv”);
BufferedReader in=新的BufferedReader(f);
而((line=in.readLine())!=null)
{
st=新的StringTokenizer(行“,”);
id=st.nextToken(“,”).trim();
a=整数.valueOf(st.nextToken(“,”).trim());
s=st.nextToken(“,”).trim().toUpperCase();
g=st.nextToken(“,”).trim().toUpperCase();
sa=整数.valueOf(st.nextToken().trim());
添加(新的HealthRec2(id、a、s、g、sa));
}//循环直到文件结束
in.close();
f、 close();
}
catch(异常e){e.printStackTrace();};
System.out.println(records.getSize()+“记录已处理”);
//按年龄搜索
System.out.print(“输入要搜索的1个字符的年龄缩写:”);
字符串用户界面;
扫描仪输入=新扫描仪(System.in);
ui=input.next().trim();
System.out.println(“在“+ui”中搜索所有记录);
ArrayList al=records.searchByAge(Integer.valueOf(ui.trim());
System.out.println(al.size()+“找到记录”);
}
}
/**
数据类示例记录:
5501986,31,西弗吉尼亚州,F,1
1539057187,5,UT,M,2
**/
HealthRec2类
{
字符串ID;
整数年龄;
字符串状态;
字符串性别;
智力状态;
公共卫生REC2(){}
public HealthRec2(字符串i、整数a、字符串s、字符串g、整数sa)
{ID=i;年龄=a;状态=s;性别=g;状态=sa;}
//读者方法
公共字符串getID(){return ID;}
公共整数getAge(){return age;}
公共字符串getState(){return state;}
公共字符串getGender(){返回性别;}
public int getStatus(){return status;}
//作者方法
公共无效设置(整数a){age=a;}
public void setState(字符串s){state=s;}
public void setGender(字符串g){gender=g;}
public void setStatus(int sa){status=sa;}
公共字符串toString()
{返回ID+“”+年龄+“”+状态+“”+性别+“”+状态;}
}//HealthRec
//用于实现需求的数据结构
//此实现使用java.util.ArrayList
类HealthDS2
{
ArrayList rec;
公共卫生2()
{rec=newarraylist();}
公共卫生DS2(HealthRec2 r)
{
rec=newarraylist();
建议增补(r);
}
public int getSize(){return rec.size();}
公共无效添加(healthrec2r){rec.add(r);}
//按年龄搜索
//不需要数据验证——假设1个字符的年龄有效
//返回记录的ArrayList
公共ArrayList searchByAge(整数a)
{
ArrayList temp=新的ArrayList();
对于(int k=0;k
我的目标是根据状态
、状态
、性别
和年龄
组进行搜索。我已经为其他人这样做了,但我只是对年龄组有一点问题,因为它是分组的,而不仅仅是在数据文件中搜索特定的年龄。我尝试为每个组创建七个ArrayList,但在组之间切换时仍有一点问题。此代码执行以下操作:
public static void main (String[] args) throws java.lang.Exception
{
int[] groupMin = new int[]{0, 10, 20};
int[] groupMax = new int[]{10, 20, 9999};
int[] ages = new int[]{ 1, 2, 3, 10, 12, 76, 56, 89 };
int targetGroup = 1;
int count = 0;
for( int age : ages ){
if( age >= groupMin[targetGroup] && age < groupMax[targetGroup] ){
count++;
}
}
System.out.println("Group " + targetGroup + " range is " +
groupMin[targetGroup] + " - " + groupMax[targetGroup]);
System.out.println("Count: " + count);
}
publicstaticvoidmain(字符串[]args)抛出java.lang.Exception
{
int[]groupMin=newint[]{0,10,20};
int[]groupMax=newint[]{10,20,9999};
int[]年龄=新的int[]{1,2,3,10,12,76,56,89};
int targetGroup=1;
整数计数=0;
for(整数年龄:年龄){
如果(年龄>=groupMin[targetGroup]&&age
您可以在这里使用它:想法一:排序并使用二进制搜索
想法二:使用区间树您可以使用某种方法初始化1000000个用户,甚至下面的代码都会为用户生成随机年龄:
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
public class UserListDemo {
int age;
class Users{
int age=0;
public Users(int a)
{
age=a;
}
public void setAge(int age)
{
this.age=age;
}
public int getAge()
{
return this.age;
}
}
public static void main(String a[])
{
UserListDemo uld=new UserListDemo();
ArrayList<Users> data=new ArrayList<Users>();
uld.initializeUsers(data);
System.out.println("Enter age group choice");
System.out.println("Enter 1 for age group 1-6");
System.out.println("Enter 2 for age group 7-18");
System.out.println("Enter 3 for age group 19-26");
System.out.println("Enter 4 for age group 27-49");
System.out.println("Enter 5 for age group 50-64");
System.out.println("Enter 6 for age group 65-79");
System.out.println("Enter 7 for age group 80-Older");
Scanner sc=new Scanner(System.in);
String choice=sc.nextLine();
int ch=Integer.valueOf(choice);
long result=0;
switch(ch)
{
case 1:
for(Users us:data)
{
if(us.age<=6)
result++;
}
case 2:
for(Users us:data)
{
if( us.age>=7 && us.age<=18 )
result++;
}
case 3:
for(Users us:data)
{
if( us.age>=19 && us.age<=26 )
result++;
}
case 4:
for(Users us:data)
{
if( us.age>=27 && us.age<=49 )
result++;
}
case 5:
for(Users us:data)
{
if( us.age>=50 && us.age<=64 )
result++;
}
case 6:
for(Users us:data)
{
if( us.age>=65 && us.age<=79 )
result++;
}
case 7:
for(Users us:data)
{
if( us.age>=80)
result++;
}
}
System.out.println("For the entered age group :"+ch+" ::"+result+" user has been found");
}
public void initializeUsers(ArrayList<Users> data)
{
Users us;
Random rand=new Random();
for(long l=0;l<1000000L;l++)
{
us=new Users(rand.nextInt(100));
data.add(us);
}
}
}
import java.util.ArrayList;
导入java.util.Random;
导入java.util.Scanner;
公共类UserListDemo{
智力年龄;
类用户{
int年龄=0;
公共用户(INTA)
{
年龄=a;
}
公共无效设置(整数)
{
这个。年龄=年龄;
}
公共整数getAge()
{
返回这个年龄;
}
}
公共静态void main(字符串a[]
{
UserListDemo uld=新的UserListDemo();
ArrayList数据=新的ArrayList();
uld.初始化用户(数据);
System.out.println(“输入年龄组选择”);
System.out.println(“为年龄组输入1
// within HealthRec2
int group; // stores group number as an attribute
private static final int[] ageGroups = // age limits for each group
new int[]{6, 18, 26, 49, 64, 79};
private void updateGroup() { // <-- called from constructor and from setAge()
int currentGroup = 0;
for (int limit : ageGroups) {
currentGroup ++; // advance to next group
if (age <= limit) break; // stop looking at limits once we reach one
}
group = currentGroup;
}
private int getGroup() { return group; }
// within HealthRec2
private static final int[] ageGroups = // age limits for each group
new int[]{6, 18, 26, 49, 64, 79};
public int getGroup() {
int currentGroup = 0;
for (int limit : ageGroups) {
currentGroup ++; // advance to next group
if (age <= limit) break; // stop looking at limits once we reach one
}
return currentGroup;
}