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  • java Collections.binarySearch 用法

    package testCollections;

    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Comparator;
    import java.util.List;

    /**
    * @Author: zhilei.wang
    * @Date: 2019/11/11 14:08
    * @Version 1.0
    */
    public class TestCollection {
    public static void main(String[] args) {
    Student s1 = new Student("Alex", 10);
    Student s2 = new Student("Jerry", 20);
    Student s3 = new Student("Hustoy", 40);

    List<Student> students = new ArrayList<>();
    students.add(s1);
    students.add(s2);
    students.add(s3);

    // Collections.sort(students);

    // int searchResult = Collections.binarySearch(students, new Student("Jerry", 20));
    int alex = Collections.binarySearch(students, new Student("Jerry", 20), new Comparator<Student>() {
    @Override
    public int compare(Student o1, Student o2) {
    //int num = this.age - o.age;
    int num = o1.getAge() - o2.getAge();
    int num1 = (num == 0 ? o1.getUsername().compareTo(o2.getUsername()) : num);
    return num1;
    }
    });

    System.out.println(alex);

    }
    }


    class Student /*implements Comparable<Student> */ {
    private String username;
    private int age;

    public Student(String username, int age) {
    this.username = username;
    this.age = age;
    }

    public String getUsername() {
    return username;
    }

    public void setUsername(String username) {
    this.username = username;
    }

    public int getAge() {
    return age;
    }

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

    /*
    @Override
    public int compareTo(Student o) {
    int num = this.age - o.age;
    int num1 = (num == 0 ? this.username.compareTo(o.username) : num);
    return num1;
    }

    */


    }
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  • 原文地址:https://www.cnblogs.com/leigepython/p/11834854.html
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