一、对象数组

1.需求：定义一个长度为3的数组，存储3个person对象，遍历数组，将三个person对象中的属性值获取出来

public class Person {
    private String name;
    private int age;

    public Person(String name,int age) {
        this.name = name;
        this.age = age;
    }

    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 static void main(String[] args) {
        /*

        1.定义一个存储int型数据的数组：int[]
        2.定义一个Person型的数组：Person[]
         */

        //定义数组
        Person[] arr = new Person[3];

        //创建三个对象
        Person p1 = new Person("金莲",27);
        Person p2 = new Person("大郎",36);
        Person p3 = new Person("张三",18);

        //将三个对象保存到数组中
        arr[0] = p1;
        arr[1] = p2;
        arr[2] = p3;

        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i]); //存的是地址值
            System.out.println(arr[i].getAge()+" "+arr[i].getName());
        }
    }

二、练习

1.定义学生类Student

        声明学生姓名和成绩成员变量

2.测试类的main函数中创建一个可以装三个对象的数组，并且按照学生成绩排序，显示学生信息

public class Student {
    private String name;
    private int score;

    public Student(){

    }

    public Student(String name,int score){
        this.name = name;
        this.score = score;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }
}

    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("小明",83);
        students[1] = new Student("小红",91);
        students[2] = new Student("小刚",78);

        for (int j = 0; j < students.length-1; j++) {
            for (int i = 0; i < students.length-1-j; i++) {
                //成绩进行比较，但是交换的是对象
                if(students[i].getScore()>students[i+1].getScore()){
                    Student temp = students[i];
                    students[i] = students[j];
                    students[j] = temp;
                }
            }
        }

        for (int i = 0; i < students.length; i++) {
            System.out.println(students[i].getName()+" "+students[i].getScore());
        }
    }