Java中对象数组的使用方法详解

Person p1[] = {
     new Person(),
     new Person(),
     new Person()
   };

Person p2[];
p2 = new Person[3];
for(int i=0;i<p2.length;i++)
{
  p2[i] = new Person();
}

Person p3[];
p3 = new Person[3];
p3[0] = new Person();
p3[1] = new Person();
p3[2] = new Person();

Person p4[] = new Person[3];
p3[0] = new Person();
p3[1] = new Person();
p3[2] = new Person();

class Person
{
   String name = "小明";
   int age = 5;
   public Person()
   {
   }
   // 构造函数，创建新对象时调用
   public Person( String name, int age )
   {
      this.name = name ;
      this.age = age ;
   }
   public String talk()
   {
      return "我是：" + this.name + "，今年：" + this.age + "岁";
   }
}
public class ObjectArray
{
   public static void main(String[] args)
   {
      // 静态方式
      Person p1[] = {
           new Person(),
           new Person(),
           new Person()
         };
      // 动态方式
      Person p2[];
      p2 = new Person[3];
      for(int i=0;i<p2.length;i++)
      {
        p2[i] = new Person();
      }
      // 数组元素指向所定义的对象
      Person p3[];
      p3 = new Person[3];
      p3[0] = new Person();
      p3[1] = new Person();
      p3[2] = new Person();
      // 创建对象数组，并分配内存空间
      Person p4[] = new Person[3];
      p4[0] = new Person();
      p4[1] = new Person();
      p4[2] = new Person();
      for( int i = 0; i <p4.length; ++i )
      {
        System.out.println( p4[i].talk( ) ) ;
      }
      Person p[] = {
           new Person( "张三", 25 ),
           new Person( "李四", 30 ),
           new Person( "王五", 35 )
         };
      for( int i = 0; i <p.length; ++i )
      {
        System.out.println( p[i].talk( ) ) ;
      }
   }
}

Person per[];
per = new Person[3];
per[0] = new Person();
per[1] = new Person();
per[2] = new Person();

public class Test {
  public static void main(String[] args) {
    Person[] ps = new Person[3]; // 声明一个对象数组，里面有三个对象
    System.out.println("---------------数组声明后-------------------");
    for (int x = 0; x < ps.length; x++) {
      System.out.print(ps[x] + " "); // 循环输出
    }
    // 创建3个人，并实例化
    Person p1 = new Person("jerry", 18);
    Person p2 = new Person("tom", 20);
    Person p3 = new Person("rose", 25);
    ps[0] = p1; // 实例化第一个元素
    ps[1] = p2; // 实例化第二个元素
    ps[2] =p3; // 实例化第三个元素
    System.out.println("\n---------------对象实例化-------------------");
    for (int x = 0; x < ps.length; x++) {
      System.out.print(ps[x] + " ");
    }
  }
}
class Person {
  private String name; // 姓名属性
  private int age; // 年龄属性
  public Person(String name, int age) { // 通过构造方法设置内容
    this.name = name; // 为姓名赋值
    this.age = age; // 为年龄赋值
  }
  @Override
  public String toString() {
    return "Person [name=" + name + ", age=" + age + "]";
  }
}