JAVA 10

对象数组

package demo04;

/*
定义一个数组用来存储3个Person对象。
 */
class Person {
    private String name;
    private int age;

    public Person() {
    }

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

        this.name = name;
    }
    public String getName() {

        return name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public int getAge() {

        return age;
    }

}
public class Array01 {
    public static void main(String[] args) {
        Person[] arr = new Person[3];
        System.out.println(arr[0]);
        System.out.println("-------------------------------");
        Person one = new Person("Jack",18);
        Person two = new Person("Mary",29);
        Person three = new Person("John",34);

        //将one中的地址值赋值到0号元素位置
        arr[0]=one;
        arr[1]=two;
        arr[2]=three;
        System.out.println(arr[0]);//地址值
        System.out.println(arr[1]);//地址值
        System.out.println(arr[2]);//地址值
        System.out.println("-----------------------------");

        System.out.println(arr[0].getAge());
        System.out.println(arr[1].getName());
    }
}

• 运行结果

null
-------------------------------
demo04.Person@1b6d3586
demo04.Person@4554617c
demo04.Person@74a14482
-----------------------------
18
Mary

Process finished with exit code 0