List集合的各种排序

1.单属性变量List排序
          1.1按照变量属性升序，降序排序

/**
 * 单属性变量list 自身属性升序, 降序排序
 */
private void singleVariableSort1(){
 
    List list = Arrays.asList(10,1,6,4,8,7,9,3,2,5);
 
    System.out.println("原始数据：");
    list.forEach(n ->{System.out.print(n+", ");});
 
    System.out.println("");
    System.out.println("升序排列：");
    Collections.sort(list); // 升序排列
    list.forEach(n ->{System.out.print(n+", ");});
 
    System.out.println("");
    System.out.println("降序排列：");
    Collections.reverse(list); // 倒序排列
    list.forEach(n ->{System.out.print(n+", ");});
}

          1.2按照自定义的顺序排序

/**
 * 单属性变量list 自定义顺序排序
 */
private void singleVariableSort2(){
 
    List list = Arrays.asList("北京","上海","北京","广州","广州","上海","北京","上海");
 
    List sortRule = Arrays.asList("北京","上海","广州");
 
    System.out.println("原始数据：");
    list.forEach(n ->{System.out.print(n+", ");});
 
    System.out.println("");
    System.out.println("排序规则：");
    sortRule.forEach(n ->{System.out.print(n+", ");});
 
    System.out.println("");
    System.out.println("正序排列：");
    Collections.sort(list, new Comparator()
    {
        public int compare(String a1, String a2)
        {
                int io1 = sortRule.indexOf(a1);
                int io2 = sortRule.indexOf(a2);
                return io1 - io2;
        }
    });
 
    list.forEach(n ->{System.out.print(n+", ");});
 
    System.out.println("");
    System.out.println("倒序排列：");
    Collections.sort(list, new Comparator()
    {
        public int compare(String a1, String a2)
        {
            int io1 = sortRule.indexOf(a1);
            int io2 = sortRule.indexOf(a2);
            return io2 - io1;
        }
    });
 
    list.forEach(n ->{System.out.print(n+", ");});
}

2.对象List排序
          2.1按照对象单属性升序，降序排序

/**
 * 对象单属性升序，降序排序
 */
private void entitySort1(){
 
    //Student 的 list 集合
    List students = new ArrayList<>();
    students.add(new Student("张三",90,180,"电气学院","北京"));
    students.add(new Student("李四",80,165,"计算机学院","上海"));
    students.add(new Student("王五",91,170,"财经学院","上海"));
    students.add(new Student("赵明",80,182,"计算机学院","北京"));
    students.add(new Student("钱海",75,181,"计算机学院","广州"));
    students.add(new Student("孙理",82,172,"财经学院","上海"));
    students.add(new Student("周伟",90,168,"电气学院","广州"));
    students.add(new Student("郑亮",80,178,"财经学院","广州"));
 
    System.out.println("原始数据：");
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+ s.getCollege()+""+s.getAddress());});
 
    System.out.println("按照分数升序排序：");
    students.sort(comparing(Student::getScore));
    students.forEach(s ->{ 
     System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+ s.getCollege()+""+s.getAddress());}); 
 
    System.out.println("按照分数降序排序：");
    students.sort(comparing(Student::getScore).reversed());
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
}

          2.2按照对象多属性升序，降序排序

/**
 * 对象多属性升序，降序排序
 */
private void entitySort2(){
 
    //Student 的 list 集合
    List students = new ArrayList<>();
    students.add(new Student("张三",90,180,"电气学院","北京"));
    students.add(new Student("李四",80,165,"计算机学院","上海"));
    students.add(new Student("王五",91,170,"财经学院","上海"));
    students.add(new Student("赵明",80,182,"计算机学院","北京"));
    students.add(new Student("钱海",75,181,"计算机学院","广州"));
    students.add(new Student("孙理",82,172,"财经学院","上海"));
    students.add(new Student("周伟",90,168,"电气学院","广州"));
    students.add(new Student("郑亮",80,178,"财经学院","广州"));
 
    System.out.println("原始数据：");
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
 
    System.out.println("按照分数降序排序,当分数相同时, 按照身高升序排序");
    students.sort(comparing(Student::getScore).reversed().thenComparing(Student::getHeight));
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
 
    System.out.println("按照分数降序排序,当分数相同时, 按照身高降序排序");
    Collections.sort(students, new Comparator()
    {
        public int compare(Student student1, Student student2)
        {
            if(student1.getScore().equals(student2.getScore())){
                return student2.getHeight() - student1.getHeight();
            }else{
                return student2.getScore() - student1.getScore();
            }
        }
    });
 
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
}

          2.3按照对象自定义单属性的顺序排序

/**
 * 对象自定义单属性的顺序排序
 */
private void entitySort3(){
 
    //Student 的 list 集合
    List students = new ArrayList<>();
    students.add(new Student("张三",90,180,"电气学院","北京"));
    students.add(new Student("李四",80,165,"计算机学院","上海"));
    students.add(new Student("王五",91,170,"财经学院","上海"));
    students.add(new Student("赵明",80,182,"计算机学院","北京"));
    students.add(new Student("钱海",75,181,"计算机学院","广州"));
    students.add(new Student("孙理",82,172,"财经学院","上海"));
    students.add(new Student("周伟",90,168,"电气学院","广州"));
    students.add(new Student("郑亮",80,178,"财经学院","广州"));
 
    System.out.println("原始数据：");
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
 
    System.out.println("自定义按照地区（北京,上海,广州）排序：");
    List addressOrder = Arrays.asList("北京","上海","广州");
    Collections.sort(students, new Comparator()
    {
        public int compare(Student student1, Student student2)
        {
                int io1 = addressOrder.indexOf(student1.getAddress());
                int io2 = addressOrder.indexOf(student2.getAddress());
                return io1 - io2;
        }
    });
 
    students.forEach( s ->{
       System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
}

          2.4按照对象自定义多属性的顺序排序

/**
 * 对象自定义多属性的顺序排序
 */
private void entitySort4(){
 
    //Student 的 list 集合
    List students = new ArrayList<>();
    students.add(new Student("张三",90,180,"电气学院","北京"));
    students.add(new Student("李四",80,165,"计算机学院","上海"));
    students.add(new Student("王五",91,170,"财经学院","上海"));
    students.add(new Student("赵明",80,182,"计算机学院","北京"));
    students.add(new Student("钱海",75,181,"计算机学院","广州"));
    students.add(new Student("孙理",82,172,"财经学院","上海"));
    students.add(new Student("周伟",90,168,"电气学院","广州"));
    students.add(new Student("郑亮",80,178,"财经学院","广州"));
 
    System.out.println("原始数据：");
    students.forEach(s ->{
       System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
 
    System.out.println("先按照学院（电气学院,计算机学院,财经学院）排序， 当学院相同时,按照地区（北京,上海,广州）排序");
    List collegeOrder = Arrays.asList("电气学院","计算机学院","财经学院");
    List addressOrder = Arrays.asList("北京","上海","广州");
    Collections.sort(students, new Comparator()
    {
        public int compare(Student student1, Student student2)
        {
            if(student1.getCollege().equals(student2.getCollege())){
                int io1 = addressOrder.indexOf(student1.getAddress());
                int io2 = addressOrder.indexOf(student2.getAddress());
                return io1 - io2;
            }else{
                int io1 = collegeOrder.indexOf(student1.getCollege());
                int io2 = collegeOrder.indexOf(student2.getCollege());
                return io1 - io2;
            }
        }
    });
 
    students.forEach( s ->{
       System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
}

          2.5按照对象属性自定义混合排序

/**
 * 对象属性自定义混合排序
 */
private void entitySort5(){
 
    //Student 的 list 集合
    List students = new ArrayList<>();
    students.add(new Student("张三",90,180,"电气学院","北京"));
    students.add(new Student("李四",80,165,"计算机学院","上海"));
    students.add(new Student("王五",91,170,"财经学院","上海"));
    students.add(new Student("赵明",80,182,"计算机学院","北京"));
    students.add(new Student("钱海",75,181,"计算机学院","广州"));
    students.add(new Student("孙理",82,172,"财经学院","上海"));
    students.add(new Student("周伟",90,168,"电气学院","广州"));
    students.add(new Student("郑亮",80,178,"财经学院","广州"));
 
    System.out.println("原始数据：");
    students.forEach(s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());});
 
    //先按照分数从高到低排序,当分数相同时,然后按照地区（北京,上海,广州）排序
    List addressOrder = Arrays.asList("北京","上海","广州");
    Collections.sort(students, new Comparator()
    {
        public int compare(Student student1, Student student2)
        {
            if(student1.getScore().equals(student2.getScore())){
                int io1 = addressOrder.indexOf(student1.getAddress());
                int io2 = addressOrder.indexOf(student2.getAddress());
                return io1 - io2;
            }else{
                return student2.getScore() - student1.getScore();
            }
        }
    });
 
    System.out.println("");
    System.out.println("先按照分数从高到低排序,当分数相同时,然后按照地区（北京,上海,广州）排序：");
    students.forEach( s ->{
      System.out.println(s.getName()+" "+ s.getScore()+" "+s.getHeight()+" "+s.getCollege()+""+s.getAddress());}); 
}

          2.6按照对象单属性升序，降序排序(float类型)

/**
 * 对象单属性升序，降序排序(float类型)
 */
private void entitySort6(){
 
   //Shop 的 list 集合
   List shops = new ArrayList<>();
   shops.add(new Shop("华润万家", 20200921, (float) 10000.25));
   shops.add(new Shop("华润万家", 20200922, (float) 20000.26));
   shops.add(new Shop("华润万家", 20200923, (float) 9999.37));
   shops.add(new Shop("华润万家", 20200924, (float) 12587.86));
   shops.add(new Shop("华润万家", 20200925, (float) 15798.65));
 
   System.out.println("原始数据：");
   shops.forEach(s ->{
      System.out.println(s.getName() + " " + s.getDate() + " " + s.getIncome() );
   });
 
   System.out.println("按照收入升序排序：");
   shops.sort(comparing(Shop::getIncome));
   shops.forEach(s ->{
      System.out.println(s.getName() + " " + s.getDate() + " " + s.getIncome());
   });
 
   System.out.println("按照收入降序排序：");
   shops.sort(comparing(Shop::getIncome).reversed());
   shops.forEach(s ->{
      System.out.println(s.getName() + " " + s.getDate() + " " + s.getIncome());
   });
 
 
}