[Java] BigData achieve universal basic _ sort of tools

Brief introduction

Implement a generic sorting tools, sorted according to the sort of objects selected by a user; e.g., by use of age Age sort sorting, sorting by the wages or salary case of equal

Code

FIG code structure:

 

 

package cn.test.logan.day08;

import java.util.ArrayList;

public class SortUtilTest {
    public static void main(String[] args) {
        User u1 = new User("001","张三",30,1000);
        User u2 = new User("002","李四",29,1200);
        User u3 = new User("003","王五",27,1000);
        User u4 = new User("004","狗蛋",24,1400);
        
        ArrayList<User> list = new ArrayList<>();
        list.add(u1);
        list.add(u2);
        list.add(u3);
        list.add(u4);
        
        // age sort
         // SortUtil.sort (List, new new AgeCompare ());
        
        // According to the sort of wages
         // SortUtil.sort (List, new new SalaryCompare ());
        
        //   first based on salary, wages are equal according to age 
        SortUtil.sort (List, new new SalaryAgeCompare ());
        
        
        
        for(User u:list) {
            System.out.println(u);
        }
    }
}

SortUtilTest.java

package cn.test.logan.day08;

import java.util.ArrayList;

public class SortUtil {
    public static void sort(ArrayList<User> uList,Compare com) {
        for(int i=0;i<uList.size()-1;i++) {
            for(int j=0;j<uList.size()-1-i;j++) {
                // 判断大小
                boolean res = com.compare(uList.get(j), uList.get(j+1));
                if(res) {
                    User tmp = uList.get(j);
                    uList.set(j,uList.get(j+1));
                    uList.set(j+1, tmp);
                }
            }
        }
    }
}

SortUtil.java

package cn.test.logan.day08;

public interface Compare {
    public boolean compare(User u1,User u2);
}

Compare.java

package cn.test.logan.day08;
/**
 * Define a User class
 * Include: ID, name, age, salary
 * @author QIN
 *
 */
public class User {


    private String id;
    private String name;
    private int age;
    private float salary;
    
    public User() {
        
    }
    
    public User(String id, String name, int age, float salary) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.salary = salary;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public float getSalary() {
        return salary;
    }

    public void setSalary(float salary) {
        this.salary = salary;
    }
    
    // 定义toString方法
    @Override
    public String toString() {
        return this.id + "," + this.name + "," + this.age + "," + this.salary;
    }
    
    
}

User.java

The following are the three after age, salary, age, sort of like the first wage

package cn.test.logan.day08;

public class AgeCompare implements Compare{

    @Override
    public boolean compare(User u1, User u2) {
        if(u1.getAge() > u2.getAge()) {
            return true;
        }
        return false;
    }

}

AgeCompare .java

package cn.test.logan.day08;

public class SalaryCompare implements Compare{
    @Override
    public boolean compare(User u1, User u2) {
        if(u1.getSalary() > u2.getSalary()) {
            return true;
        }
        return false;
    }

}

SalaryCompare.java

 

package cn.test.logan.day08;

public class SalaryAgeCompare implements Compare{

    @Override
    public  Boolean Compare (the User U1, the User U2) {
         // first sorted according to wages, salaries if they are the same age ordered 
        IF (u1.getSalary ()> u2.getSalary ()) {
             return  to true ;
        }
        if(u1.getSalary() == u2.getSalary()) {
            if(u1.getAge() > u2.getAge() ) {
                return true;
            }
        }
        return false;
        
    }

}

SalaryAgeCompare.java