package wjtest_01;

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

public class ListSort {br/>@SuppressWarnings("unchecked")
public static void main(String[] args) {

    List list = new ArrayList();

    // 创建3个学生对象，年龄分别是20、19、21，并将他们依次放入List中
    Student s1 = new Student();
    s1.setAge(20);
    s1.setUsable(true);
    Student s2 = new Student();
    s2.setAge(19);
    s2.setUsable(true);
    Student s3 = new Student();
    s3.setAge(21);
    s3.setUsable(false);
    list.add(s1);
    list.add(s2);
    list.add(s3);

    System.out.println("排序前：" + list);
  Collections.sort(list, new Comparator<Student>() {```

      @Override
      public int compare(Student o1, Student o2) {
          // 按照学生的年龄进行升序排列
          if (o1.getAge() > o2.getAge()) {
              return 1;
          }
          if (o1.getAge() == o2.getAge()) {
              return 0;
          }
          return -1;
      }
  });
    System.out.println("升序排序后：" + list);

Collections.sort(list, new Comparator() {

      public int compare(Student o1, Student o2) {

          // 按照学生的年龄进行降序排列
          if (o1.getAge() > o2.getAge()) {
              return -1;
          }
          if (o1.getAge() == o2.getAge()) {
              return 0;
          }
          return 1;
      }
  });
    System.out.println("降序排序后：" + list);

    Boolean b1 = true; // 创建Boolean对象1

    Boolean b2 = false; // 创建Boolean对象0

    Boolean b3 = true; // 创建Boolean对象1
    System.out.println(b1);

    int i;

    i = b1.compareTo(b2); // b1和b2进行比较  

    System.out.println(i);//1-0 

    i = b2.compareTo(b1); // b2和b1进行比较

    System.out.println(i);//0-1

    i = b1.compareTo(b3); // b1和b3进行比较

    System.out.println(i);//1-1
}

}

class Student{ 

private int age;

private Boolean isUsable;

public int getAge() {  
    return age;  
}  

public Boolean isUsable() {
    return isUsable;
}

public void setUsable(Boolean isUsable) {
    this.isUsable = isUsable;
}

public void setAge(int age) {  
    this.age = age;  
}  
@Override  
public String toString() {  
    return getAge()+"";  
}

}
转载自：https://blog.csdn.net/wangjuan_01/article/details/51351633
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