Arrays类中toString和deepToString的区别

• Arrays.toString()当数组中有数组时，不会打印出数组中的内容，只会以地址的形式打印出来，返回一个包含数组元素的字符串

• Arrays.deepToString()主要用于数组中包含数组(多维数组)，会将内嵌数组的内容也打印出来

示例

import java.util.*;
import java.math.*;
public class Main{
	public static void main(String[] args) {
		
		String a1[]={"string1","string2","string3"};
		
		int[][] a2={
				{1,2,3,4},
				{5,6,7,8},
		};
		
		int[] a3 = {1,2,3};
		
		System.out.println(Arrays.toString(a1));
		System.out.println(Arrays.deepToString(a1));
		
		System.out.println(Arrays.toString(a2));
		System.out.println(Arrays.deepToString(a2));
		
		System.out.println(Arrays.toString(a3));
		//System.out.println(Arrays.deepToString(a3));  
		//会报错The method deepToString(Object[]) in the type Arrays is not applicable for the arguments (int[])
		//数组类型中的方法deepToString（Object []）不适用于参数（int []）
		//int基本数据类型，而String是Object的子类
	}
}

//输出
[string1, string2, string3]
[string1, string2, string3]
[[I@106d69c, [I@52e922]
[[1, 2, 3, 4], [5, 6, 7, 8]]
[1, 2, 3]