Java之PriorityQueue的使用解读

		PriorityQueue<Integer> queue = new PriorityQueue<>(
                (o1, o2) -> o2 - o1
        );

		PriorityQueue<Integer> queue = new PriorityQueue<>(new Comparator<Integer>() {
            @Override
            public int compare(Integer o1, Integer o2) {
                return o2 - o1;
            }
        });

		PriorityQueue<String> queue = new PriorityQueue<>(
                (o1, o2) -> o2.charAt(2) - o1.charAt(2)
        );

public class Solution {
    public static void main(String[] args) {
        PriorityQueue<People> queue = new PriorityQueue<>(
                (o1, o2) -> {
                    if (o1.getName().compareTo(o2.getName()) > 0) {
                        return 1;
                    } else if (o1.getName().compareTo(o2.getName()) < 0) {
                        return -1;
                    } else {
                        if (o1.getAge() > o2.getAge()) {
                            return 1;
                        } else if (o1.getAge() < o2.getAge()) {
                            return -1;
                        } else {
                            if (o1.getHeight() - o2.getHeight() > 0) {
                                return 1;
                            } else if (o1.getHeight() - o2.getHeight() < 0) {
                                return -1;
                            } else {
                                return 0;
                            }
                        }
                    }
                }
        );
        People one = new People("one", 12, 45.6f);
        People two = new People("one", 12, 12.3f);
        queue.add(one);
        queue.add(two);
        for (People tmp : queue) {
            System.out.println(tmp);
        }
    }
}

class People {
    private String name;
    private int age;
    private float height;

    public People(String name, int age, float height) {
        this.name = name;
        this.age = age;
        this.height = height;
    }

    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 getHeight() {
        return height;
    }

    public void setHeight(float height) {
        this.height = height;
    }

    @Override
    public String toString() {
        return "people{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", height=" + height +
                '}';
    }
}