Student实体类内部比较器比较年龄，身高，名字

秒速五厘米 2023-10-10 22:39 49阅读 0赞

Student实体类代码如下所示：
    package com.test.Test08;
    
    
    public class Student implements Comparable<Student>{
        private int age;
        private double height;
        private String name;
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public double getHeight() {
            return height;
        }
    
        public void setHeight(double height) {
            this.height = height;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Student(int age, double height, String name) {
            this.age = age;
            this.height = height;
            this.name = name;
        }
    
        @Override
        public String toString() {
            return "Student{" +
                    "age=" + age +
                    ", height=" + height +
                    ", name='" + name + '\'' +
                    '}';
        }
    
        @Override
        public int compareTo(Student o) {
            // return 0;
            //按照年龄进行比较
            //return this.getAge()-o.getAge();
            //按照身高进行比较
            /*return ((Double)(this.getHeight())).compareTo((Double)(o.getHeight()));*/
            //按照名字比较
            return this.getName().compareTo(o.getName());
        }
    }

测试类如下所示：

package com.test.Test08;
    
    public class Test02 {
        public static void main(String[] args) {
            //比较两个学生
            Student s1 = new Student(14, 160.2, "lili2");
            Student s2 = new Student(14, 170.5, "lili");
            //System.out.println(s1.compareTo(s2)); //0 -4  年龄进行比较
            //System.out.println(s1.compareTo(s2)); //-1 身高进行比较
            System.out.println(s1.compareTo(s2)); //0 1 名字进行比较
        }
    }