技術標籤：資料結構與演算法

編寫Student類實現Comparable介面，重寫compareTo方法

package sort;

//定義一個Student類，具有age和username兩個屬性，通過Comparable結構提供比較規則
public class Student implements Comparable<Student>{
	private String username;
	private int 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 String toString() {
		return "Student [username=" + username + ", age=" + age + "]";
	}
	@Override
	public
 
 int compareTo(Student o) {
		// TODO Auto-generated method stub
		return this.age - o.age;
	}
	
}

package test;

import sort.Student;

public class TestComparable {
	
	public static void main(String[] args) {
		Student s1 = new Student();
		s1.setUsername("小強");
		s1.setAge(18);
		
		Student s2 =
 
 new Student();
		s2.setUsername("小紅");
		s2.setAge(19);
		
		Comparable max = getMax(s1,s2);
		
		//由於重寫了toString方法，所以可以輸出資訊
		System.out.println(max);
	}
	
	//返回較大的物件
	public static Comparable getMax(Comparable c1,Comparable c2) {
		int result = c1.compareTo(c2);
		if(result >= 0) {
			return c1;
		}else {
			return c2;
		}
	}
	
}