[英]How to convert a char array back to a string?
I have a char array:我有一个字符数组:
char[] a = {'h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'};
My current solution is to do我目前的解决方案是做
String b = new String(a);
But surely there is a better way of doing this?但肯定有更好的方法来做到这一点吗?
No, that solution is absolutely correct and very minimal.不,该解决方案是绝对正确的,而且非常少。
Note however, that this is a very unusual situation: Because String
is handled specially in Java, even "foo"
is actually a String
.但是请注意,这是一种非常不寻常的情况:因为String
在 Java 中是专门处理的,即使"foo"
实际上也是一个String
。 So the need for splitting a String into individual char
s and join them back is not required in normal code.因此,在普通代码中不需要将 String 拆分为单独的char
并将它们连接回来。
Compare this to C/C++ where "foo"
you have a bundle of char
s terminated by a zero byte on one side and string
on the other side and many conversions between them due do legacy methods.将此与 C/C++ 中的"foo"
进行比较,其中"foo"
您有一堆char
,一侧以零字节string
,另一侧以string
,并且由于遗留方法,它们之间有许多转换。
String text = String.copyValueOf(data);
or要么
String text = String.valueOf(data);
is arguably better (encapsulates the new String
call).可以说更好(封装了new String
调用)。
This will convert char array back to string:这会将字符数组转换回字符串:
char[] charArray = {'a', 'b', 'c'};
String str = String.valueOf(charArray);
String str = "wwwwww3333dfevvv";
char[] c = str.toCharArray();
Now to convert character array into String , there are two ways.现在要将字符数组转换为 String ,有两种方法。
Arrays.toString(c);
Returns the string [w, w, w, w, w, w, 3, 3, 3, 3, d, f, e, v, v, v]
.返回字符串[w, w, w, w, w, w, 3, 3, 3, 3, d, f, e, v, v, v]
。
And:和:
String.valueOf(c)
Returns the string wwwwww3333dfevvv
.返回字符串wwwwww3333dfevvv
。
In Summary : pay attention to Arrays.toString(c)
, because you'll get "[w, w, w, w, w, w, 3, 3, 3, 3, d, f, e, v, v, v]"
instead of "wwwwww3333dfevvv"
.总结:注意Arrays.toString(c)
,因为你会得到"[w, w, w, w, w, w, 3, 3, 3, 3, d, f, e, v, v, v]"
而不是"wwwwww3333dfevvv"
。
A String in java is merely an object around an array of chars. java 中的 String 只是一个围绕字符数组的对象。 Hence a因此一个
char[]
is identical to an unboxed String with the same characters.与具有相同字符的未装箱字符串相同。 By creating a new String from your array of characters通过从您的字符数组创建一个新字符串
new String(char[])
you are essentially telling the compiler to autobox a String object around your array of characters.您实际上是在告诉编译器在您的字符数组周围自动装箱一个 String 对象。
You can use String.valueOf
method.您可以使用String.valueOf
方法。
For example,例如,
char[] a = {'h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'};
String b = String.valueOf(a);
System.out.println("Char Array back to String is: " + b);
For more on char array to string you can refer links below有关字符数组到字符串的更多信息,您可以参考下面的链接
https://docs.oracle.com/javase/7/docs/api/java/lang/String.html https://docs.oracle.com/javase/7/docs/api/java/lang/String.html
https://www.flowerbrackets.com/convert-char-array-to-string-java/ https://www.flowerbrackets.com/convert-char-array-to-string-java/
package naresh.java;
public class TestDoubleString {
public static void main(String args[]){
String str="abbcccddef";
char charArray[]=str.toCharArray();
int len=charArray.length;
for(int i=0;i<len;i++){
//if i th one and i+1 th character are same then update the charArray
try{
if(charArray[i]==charArray[i+1]){
charArray[i]='0';
}}
catch(Exception e){
System.out.println("Exception");
}
}//finally printing final character string
for(int k=0;k<charArray.length;k++){
if(charArray[k]!='0'){
System.out.println(charArray[k]);
} }
}
}
//Given Character Array
char[] a = {'h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'};
//Converting Character Array to String using String funtion
System.out.println(String.valueOf(a));
//OUTPUT : hello world
Converting any given Array type to String using Java 8 Stream function使用 Java 8 Stream 函数将任何给定的数组类型转换为字符串
String stringValue =
Arrays.stream(new char[][]{a}).map(String::valueOf).collect(Collectors.joining());
Just use String.value of like below;只需使用如下所示的 String.value 即可;
private static void h() {
String helloWorld = "helloWorld";
System.out.println(helloWorld);
char [] charArr = helloWorld.toCharArray();
System.out.println(String.valueOf(charArr));
}
Try to use java.util.Arrays
.尝试使用java.util.Arrays
。 This module has a variety of useful methods that could be used related to Arrays.该模块有多种有用的方法可以与数组相关。
Arrays.toString(your_array_here[]);
试试这个
Arrays.toString(array)
String output = new String(charArray);
其中 charArray 是字符数组,输出是转换为字符串的字符数组。
Try this:试试这个:
CharSequence[] charArray = {"a","b","c"};
for (int i = 0; i < charArray.length; i++){
String str = charArray.toString().join("", charArray[i]);
System.out.print(str);
}
You can also use StringBuilder class您还可以使用 StringBuilder 类
String b = new StringBuilder(a).toString();
Use of String or StringBuilder varies with your method requirements. String 或 StringBuilder 的使用因您的方法要求而异。
1 替代方法是做:
String b = a + "";
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