开发日常小结（33）：Java中的数组是否是对象

2018年10月06日

目录

1、概念

2、测试Demo

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1、概念

数组：具有相同类型的数据的集合，1）具有固定的长度；2）在内存中占据连续空间；

Java中，数组有属性（length属性），也有方法（clone方法）；

对象的特点：封装了数据，同时提供一些属性和方法，故数组是对象！！

 

2、测试Demo

package testArray;

public class test_ArrayIsObject {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int[] a = {2,3};
		int[][] b = new int[3][2];
		String [] s = {"a","b"};
		People[] people_Array = {new People(),new People()};
		
		if(a instanceof int[]) 
			System.out.println("the type of a is int[]");
		if(b instanceof int[][])
			System.out.println("the type of b is int[][]");
		if(s instanceof String[])
			System.out.println("the type of c is String[]");
		if(people_Array instanceof People[])
			System.out.println("the type of c is People[]");
	}
	
}

class People{
	int a = 1;
	String name = "abc";
	public People(int a, String name) {
		super();
		this.a = a;
		this.name = name;
	}
	
	public People() {
		super();
		// TODO Auto-generated constructor stub
	}

	public int getA() {
		return a;
	}
	public void setA(int a) {
		this.a = a;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

 

console：

the type of a is int[]
the type of b is int[][]
the type of c is String[]
the type of c is People[]