在Java中将String转换为"Character"数组

Question

我想将a转换String为Character类的对象数组,但我无法执行转换.我知道我可以使用该toCharArray()方法将String转换为原始数据类型类型为"char"的数组,但它无法将String转换为Character类型的对象数组.

我该怎么做呢？

Answer 1

用这个:

String str = "testString";
char[] charArray = str.toCharArray();
Character[] charObjectArray = ArrayUtils.toObject(charArray);

Answer 2

一个内衬java-8:

String str = "testString";

//[t, e, s, t, S, t, r, i, n, g]
Character[] charObjectArray = 
    str.chars().mapToObj(c -> (char)c).toArray(Character[]::new); 

它的作用是:

• 得到一个IntStream人物(你可能也想看codePoints())
• 将每个'character'值映射到Character(你需要强制转换为实际上说它真的是a char,然后Java会自动将它自动封装Character)
• 通过调用获取结果数组 toArray()

Answer 3

为什么不自己写一点方法

public Character[] toCharacterArray( String s ) {

   if ( s == null ) {
     return null;
   }

   int len = s.length();
   Character[] array = new Character[len];
   for (int i = 0; i < len ; i++) {
      // Character(char) is deprecated since Java SE 9 & JDK 9
      <https://docs.oracle.com/javase/9/docs/api/java/lang/Character.html>
      // array[i] = new Character(s.charAt(i));
      array[i] = s.charAt(i);
   }

   return array;
}

Answer 4

将字符串转换为字符数组，然后将字符数组转换回字符串

   //Givent String
   String given = "asdcbsdcagfsdbgdfanfghbsfdab";

   //Converting String to Character Array(It's an inbuild method of a String)
   char[] characterArray = given.toCharArray();
   //returns = [a, s, d, c, b, s, d, c, a, g, f, s, d, b, g, d, f, a, n, f, g, h, b, s, f, d, a, b]

//一种方法：将字符数组转换回字符串

  int length = Arrays.toString(characterArray).replaceAll("[, ]","").length();

  //First Way to get the string back
  Arrays.toString(characterArray).replaceAll("[, ]","").substring(1,length-1)
  //returns asdcbsdcagfsdbgdfanfghbsfdab
  or 
  // Second way to get the string back
  Arrays.toString(characterArray).replaceAll("[, ]","").replace("[","").replace("]",""))
 //returns asdcbsdcagfsdbgdfanfghbsfdab

//第二种方式：将字符数组转换回字符串

String.valueOf(characterArray);

//第三种方式：将字符数组转换回字符串

Arrays.stream(characterArray)
           .mapToObj(i -> (char)i)
           .collect(Collectors.joining());

将字符串转换为字符数组

Character[] charObjectArray =
                           givenString.chars().
                               mapToObj(c -> (char)c).
                               toArray(Character[]::new);

将 char 数组转换为字符数组

 String givenString = "MyNameIsArpan";
char[] givenchararray = givenString.toCharArray();


     String.valueOf(givenchararray).chars().mapToObj(c -> 
                         (char)c).toArray(Character[]::new);

将 char 数组转换为字符数组的好处您可以使用 Arrays.stream 函数来获取子数组

String subStringFromCharacterArray = 

              Arrays.stream(charObjectArray,2,6).
                          map(String::valueOf).
                          collect(Collectors.joining());

Answer 5

我希望下面的代码可以帮到你.

String s="Welcome to Java Programming";
char arr[]=s.toCharArray();
for(int i=0;i<arr.length;i++){
    System.out.println("Data at ["+i+"]="+arr[i]);
}

它正在工作,输出是:

Data at [0]=W
Data at [1]=e
Data at [2]=l
Data at [3]=c
Data at [4]=o
Data at [5]=m
Data at [6]=e
Data at [7]= 
Data at [8]=t
Data at [9]=o
Data at [10]= 
Data at [11]=J
Data at [12]=a
Data at [13]=v
Data at [14]=a
Data at [15]= 
Data at [16]=P
Data at [17]=r
Data at [18]=o
Data at [19]=g
Data at [20]=r
Data at [21]=a
Data at [22]=m
Data at [23]=m
Data at [24]=i
Data at [25]=n
Data at [26]=g