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  1. Prepare
  2. Java
  3. Data Structures
  4. Java Sort
  5. Discussions

Java Sort

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347 Discussions

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  • muthusamysundar1
     + 0 comments

    Using Java 8

    import java.util.*;

    class Student{ private int id; private String fname; private double cgpa; public Student(int id, String fname, double cgpa) { super(); this.id = id; this.fname = fname; this.cgpa = cgpa; } public int getId() { return id; } public String getFname() { return fname; } public double getCgpa() { return cgpa; } }

    //Complete the code public class Solution { public static void main(String[] args){ Scanner in = new Scanner(System.in); int testCases = Integer.parseInt(in.nextLine());

        List<Student> studentList = new ArrayList<Student>();
    while(testCases>0){
        int id = in.nextInt();
        String fname = in.next();
        double cgpa = in.nextDouble();

        Student st = new Student(id, fname, cgpa);
        studentList.add(st);

        testCases--;
    }
   Collections.sort(studentList,
    Comparator.comparing(Student::getCgpa).reversed()
    .thenComparing(Student::getFname)
    .thenComparing(Student::getId));

    for(Student st: studentList){
        System.out.println(st.getFname());
    }
}

    }

  • Damian_GDO_92
     + 0 comments
    import java.util.*;

class Student implements Comparable<Student>{
    private int id;
    private String fname;
    private double cgpa;
    
    public Student(int id, String fname, double cgpa) {
        super();
        this.id = id;
        this.fname = fname;
        this.cgpa = cgpa;
    }
    
    public int getId() {
        return id;
    }
    
    public String getFname() {
        return fname;
    }
    
    public double getCgpa() {
        return cgpa;
    }

    @Override
    public int compareTo(Student anotherStudent) {
        if (Double.compare(anotherStudent.getCgpa(), this.getCgpa()) != 0) {
            return Double.compare(anotherStudent.getCgpa(), this.getCgpa());
        } else if (!this.getFname().equals(anotherStudent.getFname())) {
            return this.getFname().compareTo(anotherStudent.getFname());
        } else {
            return this.getId() - anotherStudent.getId();
        }
    }
}

//Complete the code
public class Solution {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int testCases = Integer.parseInt(in.nextLine());
        
        List<Student> studentList = new ArrayList<Student>();
        
        while (testCases>0) {
            int id = in.nextInt();
            String fname = in.next();
            double cgpa = in.nextDouble();
            
            Student st = new Student(id, fname, cgpa);
            studentList.add(st);
            
            testCases--;
        }
      
        in.close();

        Collections.sort(studentList);
      
          for (Student st: studentList) {
            System.out.println(st.getFname());
        }
    }
}

  • spriyamalar
     + 0 comments
        Comparator<Student> cgpaComp = (s1, s2) -> Double.valueOf(s2.getCgpa()).compareTo(Double.valueOf(s1.getCgpa()));
    Comparator<Student> nameComp = (s1, s2) -> s1.getFname().compareTo(s2.getFname());
    Comparator<Student> idComp = (s1, s2) -> Integer.valueOf(s1.getId()).compareTo(Integer.valueOf(s2.getId()));

    studentList = studentList.
            stream().
            sorted(cgpaComp.thenComparing(nameComp).thenComparing(idComp)).
            collect(Collectors.toList());

  • vijayanandutrak1
     + 0 comments

    import java.util.*;

    class Student{ private int id; private String fname; private double cgpa; public Student(int id, String fname, double cgpa) { super(); this.id = id; this.fname = fname; this.cgpa = cgpa; } public int getId() { return id; } public String getFname() { return fname; } public double getCgpa() { return cgpa; } }

    //Complete the code public class Solution { public static void main(String[] args){ Scanner in = new Scanner(System.in); int testCases = Integer.parseInt(in.nextLine());

        List<Student> studentList = new ArrayList<Student>();
    while(testCases>0){
        int id = in.nextInt();
        String fname = in.next();
        double cgpa = in.nextDouble();

        Student st = new Student(id, fname, cgpa);
        studentList.add(st);

        testCases--;
    }
    //String [] a=new String[testCases];
    for(int i=0;i<studentList.size()-1;i++){
        for(int j=0;j<studentList.size()-1;j++){
            if(studentList.get(j).getCgpa()<studentList.get(j+1).getCgpa()){
                Student sl=studentList.get(j);
                studentList.set(j, studentList.get(j+1));
                studentList.set(j+1, sl);
            }
            else if(studentList.get(j).getCgpa()==studentList.get(j+1).getCgpa()){
                if(studentList.get(j).getFname().compareTo(studentList.get(j+1).getFname())>0){
                    Student sl=studentList.get(j);
                    studentList.set(j, studentList.get(j+1));
                    studentList.set(j+1, sl);
                }
            }
        }
    }

    for(Student st: studentList){
        System.out.println(st.getFname());
    }
}

    }

  • yashdeora98294
     + 0 comments

    Here is Java sort solution - https://programmingoneonone.com/hackerrank-java-sort-problem-solution.html