如何在 Java 中将数组转换为字符串？
以下是在 Java 中将数组转换为字符串的各种方法:
-
Arrays.toString()方法 : Arrays.toString()方法用于返回指定数组内容的字符串表示形式。字符串表示形式由包含在方括号(“[]”)中的数组元素列表组成。相邻的元素由字符“，”(逗号后跟空格)分隔。如果数组为空，则返回“null”。
```java // Java program to demonstrate // working of Arrays.toString()
import java.io.; import java.util.;
class GFG { public static void main(String[] args) {
// Let us create different types of arrays and // print their contents using Arrays.toString() boolean[] boolArr = new boolean[] { true, true, false, true }; char[] charArr = new char[] { 'g', 'e', 'e', 'k', 's' }; double[] dblArr = new double[] { 1, 2, 3, 4 }; int[] intArr = new int[] { 1, 2, 3, 4 }; Object[] objArr = new Object[] { 1, 2, 3, 4 };
System.out.println( "Boolean Array: " + Arrays.toString(boolArr)); System.out.println( "Character Array: " + Arrays.toString(charArr)); System.out.println( "Double Array: " + Arrays.toString(dblArr)); System.out.println( "Integer Array: " + Arrays.toString(intArr)); System.out.println( "Object Array: " + Arrays.toString(objArr)); } } ```
输出:
```java Boolean Array: [true, true, false, true] Character Array: [g, e, e, k, s] Double Array: [1.0, 2.0, 3.0, 4.0] Integer Array: [1, 2, 3, 4] Object Array: [1, 2, 3, 4]
```
-
StringBuilder append(char[]):Java . lang . StringBuilder . append(char[])是将 char 数组参数的字符串表示形式附加到这个 StringBuilder 序列的内置方法。
```java // Java program to illustrate the // StringBuilder.append(char[]) method
import java.lang.*;
public class Geeks {
public static void main(String[] args) {
StringBuilder sbf = new StringBuilder("We are geeks "); System.out.println(sbf);
// Char array char[] astr = new char[] { 'G', 'E', 'E', 'k', 'S' };
// Appends string representation of char // array to this String Builder sbf.append(astr); System.out.println("Result after" + " appending = " + sbf);
sbf = new StringBuilder("We are -"); System.out.println(sbf);
// Char array astr = new char[] { 'a', 'b', 'c', 'd' };
/ Appends string representation of char array to this StringBuilder / sbf.append(astr); System.out.println("Result after appending = " + sbf); } } ```
输出:
```java We are geeks Result after appending = We are geeks GEEkS We are - Result after appending = We are -abcd
```
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