Arrays 类的deepToString()方法返回指定 Object 数组的深层内容的字符串表示形式。不像数组。 toString() ,如果数组包含其他数组作为元素,则字符串表示包括它们的内容,依此类推。
Arrays.toString() :返回指定数组内容的字符串表示形式。字符串表示由数组元素的列表组成,用方括号(“[]”)括起来。相邻元素由字符“, ”(逗号后跟空格)分隔。如果 a 为空,则返回“空”。
在对象数组的情况下,如果数组包含其他数组作为元素,它们会通过继承自 Object 的 Object.toString() 方法转换为字符串,该方法描述的是它们的身份而不是它们的内容。
- 参数:要返回其字符串表示形式的数组。
- 返回:数组的字符串表示形式。
Arrays.deepToString() : Java.util.Arrays.deepToString(Object[]) 方法是一个Java.util.Arrays 类方法。返回指定数组的“深层内容”的字符串表示形式。如果数组包含其他数组作为元素,则字符串表示包含它们的内容,依此类推。此方法旨在将多维数组转换为字符串。简单的 toString() 方法适用于简单数组,但不适用于多维数组。此方法旨在将多维数组转换为字符串。
句法:
public static String deepToString(Object[] arr)
arr – An array whose string representation is needed
This function returns string representation of arr[]. It returns “null” if the specified array is null.
JavaArrays.toString() 和 Arrays.toDeepString() 的区别
Arrays.toString() |
Arrays.deepToString() |
---|---|
We use Arrays.toString() in java to get the String representation of Object | We use Arrays.deepToString() method to get String Representation of Deep Content of the Specific array. |
We widely use Arrays.toString() to return String() representation of single dimension Array. | We can use Arrays.deepToString() method to return String representation of both single dimension and multi-dimension Arrays. |
If the array contains other arrays as elements, the string representation does not contain their contents, and so on. | If the array contains other arrays as elements, the string representation contains their contents, and so on. |
We do not use Arrays.toString() method to return String representation of multi-Dimension Array. | We can use Arrays.deepToString() method to return String representation of multi-dimension Arrays. |
Arrays.toString() work on arrays of primitives. | Arrays.deepToString() does not work on Primitives. |
下面是Arrays.toString() 和 Arrays.deepToString() 的图示:
1. Integer 的一维数组。
Java
// Java program to show the usage of
// Arrays.toString() and Arrays.deepToString()
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
Integer[] a = { 1, 2, 3, 4, 5 };
System.out.println("Using Arrays.toString(): "
+ Arrays.toString(a));
System.out.println("Using Arrays.deepToString(): "
+ Arrays.deepToString(a));
}
}
Java
// Java program to show the usage of
// Arrays.toString() and Arrays.deepToString()
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
int[] a = { 1, 2, 3, 4, 5 };
System.out.println("Using Arrays.toString(): "
+ Arrays.toString(a));
}
}
Java
// Java program to show the usage of
// Arrays.toString() and Arrays.deepToString()
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
Integer[] a1 = { 1, 2, 3, 4, 5 };
Integer[] a2 = { 6, 7, 8, 9, 10 };
Integer[][] multi = { a1, a2 };
System.out.println("Using Arrays.toString(): "
+ Arrays.toString(multi));
System.out.println("Using Arrays.deepToString(): "
+ Arrays.deepToString(multi));
}
}
Using Arrays.toString(): [1, 2, 3, 4, 5]
Using Arrays.deepToString(): [1, 2, 3, 4, 5]
2. Primitive(int) 的一维数组,其中只有 Arrays.toString() 起作用。
Java
// Java program to show the usage of
// Arrays.toString() and Arrays.deepToString()
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
int[] a = { 1, 2, 3, 4, 5 };
System.out.println("Using Arrays.toString(): "
+ Arrays.toString(a));
}
}
Using Arrays.toString(): [1, 2, 3, 4, 5]
3.多维数组:
Java
// Java program to show the usage of
// Arrays.toString() and Arrays.deepToString()
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
Integer[] a1 = { 1, 2, 3, 4, 5 };
Integer[] a2 = { 6, 7, 8, 9, 10 };
Integer[][] multi = { a1, a2 };
System.out.println("Using Arrays.toString(): "
+ Arrays.toString(multi));
System.out.println("Using Arrays.deepToString(): "
+ Arrays.deepToString(multi));
}
}
Using Arrays.toString(): [[Ljava.lang.Integer;@3d075dc0, [Ljava.lang.Integer;@214c265e]
Using Arrays.deepToString(): [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]]