如何在Java中将数组转换为字符串?
以下是在Java中将 Array 转换为 String 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。字符串表示由数组元素的列表组成,括在方括号 (“[]”) 中。相邻元素由字符“, ”(逗号后跟一个空格)分隔。如果数组为空,则返回“null”。
// 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: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[]) 是内置方法,它将 char 数组参数的字符串表示附加到这个 StringBuilder 序列。
// 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:We are geeks Result after appending = We are geeks GEEkS We are - Result after appending = We are -abcd