Java character to chars

char to Character Java

In this post, I will be sharing how to convert char to Character in Java. The main difference between char and Character is that char is a primitive data type whereas Character is a wrapper class that wraps a value of the primitive type char in an object.

There are two ways to achieve our goal:

1. Using Character.valueOf() method
2. Using new keyword

1. Using Character.valueOf() method

You can use Character’s class valueOf() method to convert char to Character as shown below:

public class CharToCharacter < public static void main(String args[]) < // Initializing char char ch= 'a'; // Converting char to Character Character ch2 = Character.valueOf(ch); // Printing Character System.out.println("Character is: " + ch2); > >

Output:
Character is: a

2. Using new keyword

You can use new keyword to convert char to Character in Java as shown below:

public class CharToCharacter2 < public static void main(String args[]) < // Initializing char char ch= 'b'; // Converting char to Character using new keyword Character ch2 = new Character(ch); // Printing Character System.out.println("Character is: " + ch2); > >

Output:
Character is: b

That’s all for today. Please mention in the comments in case you have any questions related to how to convert char to Character in Java.

About The Author

Subham Mittal has worked in Oracle for 3 years.
Enjoyed this post? Never miss out on future posts by subscribing JavaHungry

Источник

Efficient Java Programming: Converting Character to Char and Other Data Types

Learn how to convert character to char in Java and other data types efficiently. Use charValue() method, typecasting, iteration, and more for conversions. Master Java programming today!

• Converting from Character to char in Java
• Converting int to char in Java using typecasting
• Convert char to int in java using 3 ways
• Converting List to char[] and then to String in Java
• Parsing String to char in Java
• String to char array conversion in Java
• Converting char to String in Java using valueOf()
• Java Character forDigit() method
• Other simple code examples for converting character to char in Java
• Conclusion
• How to convert ASCII to char in Java?
• How to convert char to char array in Java?
• What is chars () in Java?
• How do I convert a string to a char?

Java is a widely-used programming language that requires the conversion of character to char in various situations. Converting from Character to char can be done using the charValue() method, assignment operator, or autoboxing and unboxing techniques. Other conversions like from int to char, List to char[], and String to char array or char can be done using different methods in Java.

Converting from Character to char in Java

Converting from Character to char is a common operation in Java. In this section, we will discuss three different methods that can be used to convert from Character to char.

The charValue() method

The charValue() method is the simplest way to convert a Character object to a primitive char value. This method returns the primitive char value of the invoking object. For example, consider the following code:

Character ch = 'A'; char c = ch.charValue(); 

The charValue() method returns the char value ‘A’, which is then assigned to the variable ‘c’.

The assignment operator

The assignment operator can also be used to convert a Character object to a char value. In this case, the Character object is automatically unboxed to its corresponding primitive type. For example:

Character ch = 'A'; char c = ch; 

In this code, the Character object ‘ch’ is automatically unboxed to its corresponding primitive type, char, and assigned to the variable ‘c’.

Autoboxing and unboxing

Autoboxing and unboxing techniques can be used for casting from Character to char and vice versa. Autoboxing is the automatic conversion of a primitive type to its corresponding wrapper class, and unboxing is the opposite. Here is an example of autoboxing and unboxing:

Character ch = 'A'; char c = ch; //unboxing Character ch2 = c; //autoboxing 

Converting int to char in Java using typecasting

To convert an int to a char, typecasting is required. The cast operator can be used to convert an integer value to a char value. The integer value must be within the range of ASCII values to avoid data loss. Here is an example:

In this code, the integer value 65 is cast to its corresponding char value, which is ‘A’.

Convert char to int in java using 3 ways

Converting List to char[] and then to String in Java

Converting from List to char[] requires iteration through the list and building the char[] array. The resulting char[] array can then be used to create a String object using the String constructor. Here is an example:

ListCharacter> list = Arrays.asList('A', 'B', 'C'); char[] charArray = new char[list.size()]; for (int i = 0; i  list.size(); i++)  charArray[i] = list.get(i); > String str = new String(charArray); 

In this code, the list of characters is converted to a char[] array, which is then used to create a String object.

Parsing String to char in Java

The charAt() method of the String class can be used to retrieve a char value from a specific index in the String. The resulting char value can then be assigned to a variable of type char. Here is an example:

String str = "Hello"; char c = str.charAt(0); 

In this code, the char value ‘H’ at index 0 is retrieved from the String object ‘str’ and assigned to the variable ‘c’.

String to char array conversion in Java

The toCharArray() method can be used to convert a String to a char array. The resulting char[] array can then be used for further processing. Here is an example:

String str = "Hello"; char[] charArray = str.toCharArray(); 

In this code, the String object ‘str’ is converted to a char[] array.

Converting char to String in Java using valueOf()

Different methods like String.valueOf(), Character.toString(), and new Character().toString() can be used to convert a char to a String. The valueOf() method is the most commonly used method for this conversion. Here is an example:

char c = 'A'; String str = String.valueOf(c); 

In this code, the char value ‘A’ is converted to a String object using the valueOf() method.

Java Character forDigit() method

The Character class has a static method called forDigit() that returns a char value for the character determined by the digit. This method is useful for converting a digit to its corresponding ASCII character. Here is an example:

int digit = 4; char c = Character.forDigit(digit, 10); 

In this code, the digit 4 is converted to its corresponding ASCII character, which is ‘4’.

Other simple code examples for converting character to char in Java

In Java case in point, convert char to string java code example

char c = 'a'; String s = Character.toString(c); //s == "a"

In Java , in particular, convert char to string in java code example

char c = 'a'; String s = String.valueOf(c); // fastest + memory efficient String s = Character.toString(c); String s = new String(new char[]); String s = String.valueOf(new char[]); String s = new Character(c).toString(); String s = "" + c; // slowest + memory inefficient

In Java as proof, string to char in java

// getting single character from string.. String str="abcd";char c=str.toChar(0); System.out.println("output is "+c); // output is a

In Cpp , for instance, string to char*

std::string str = "string"; const char *cstr = str.c_str(); 

In Java , for instance, java convert a string to char[] code sample

String string = "ABCDEF" ; char[] charsFromString = string.toCharArray(); //

std::string str = "string"; const char *cstr = str.c_str();

In Java , java convert a char[] to string code sample

char[] chars = < 'A', 'B', 'C', 'D', 'E', 'F' >;String str1 = String.valueOf(chars); //"ABCDEF" String str2 = new String(chars);// "ABCDEF"System.out.println(str1.equals(str2)); //"true"

In Java case in point, how to convert a string to char in java code example

String s = "a"; char c = s.charAt("0");

string temp = "cat"; char * tab2 = new char [temp.length()+1]; strcpy (tab2, temp.c_str());

Conclusion

Converting from Character to char or vice versa is a common operation in Java that can be done using various methods. Other conversions like from int to char, List to char[], and String to char array or char can also be done using different techniques. Understanding these conversions and their corresponding methods is important for efficient Java programming.

Источник

Java — Character toChars() Method

The Java Character toChars() method converts the specified character (Unicode code point) to its UTF-16 representation stored in a char array.

The Unicode code points are divided into two categories: Basic Multilingual Plane (BMP) characters and Supplementary characters. The BMP characters are ordinary characters that are already represented in 16-bit Unicode representation while supplementary characters are not.

If the specified code point is a BMP value, the resulting char array has the same value as codePoint. If the specified code point is a supplementary code point, the resulting char array has the corresponding surrogate pair.

This method occurs in two polymorphic forms with different parameters.

Syntax

Following is the syntax for Java Character toChars() method

public static char[] toChars(int codePoint) (or) public static int toChars(int codePoint, char[] dst, int dstIndex)

Parameters

• codePoint − a Unicode code point
• dst − an array of char in which the codePoint’s UTF-16 value is stored
• dstIndex − the start index into the dst array where the converted value is stored

Return Value

This method returns a char array having codePoint’s UTF-16 representation.

Example

The following example shows the usage of Java Character toChars(int codePoint) method.

package com.tutorialspoint; import java.lang.*; public class CharacterDemo < public static void main(String[] args) < // create a char array ch char ch[]; // create an int primitive cp and assign value int cp = 0x006e; // assign result of toChars on cp to ch ch = Character.toChars(cp); String str = "Char array having cp's UTF-16 representation is "; System.out.print( str ); // use a for loop to print ch for (int i = 0; i < ch.length; i++) < System.out.print( ch[i] ); >> >

Output

Let us compile and run the above program, this will produce the following result −

Char array having cp's UTF-16 representation is n

Example

The following example shows the usage of Java Character toChars(int codePoint, char[] dst, int dstIndex) method.

package com.tutorialspoint; import java.lang.*; public class CharacterDemo < public static void main(String[] args) < // create an int primitive cp and assign value int cp = 0x0036; // create an int primitive res int res; /** * create a char array dst and assign UTF-16 value of cp * to it using toChars method */ char dst[] = Character.toChars(cp); // check if cp is BMP or supplementary code point using toChars res = Character.toChars(cp, dst, 0); String str1 = "It is a BMP code point"; String str2 = "It is a is a supplementary code point"; // print res value if ( res == 1 ) < System.out.println( str1 ); >else if ( res == 2 ) < System.out.println( str2 ); >> >

Output

Let us compile and run the above program, this will produce the following result −

Example

The example program given below shows a scenario in which the method throws an IllegalArgument Exception

import java.lang.*; public class Demo < public static void main(String[] args) < char ch[]; int cp = 0x2388211; ch = Character.toChars(cp); System.out.print("Char array having cp's UTF-16 representation is "); for (int i = 0; i < ch.length; i++) < System.out.println(ch[i]); >> >

Exception

The program given above is first compiled and run, to produce the following output result. It throws an exception as the input given to the method is a non-valid Unicode code point.

Exception in thread "main" java.lang.IllegalArgumentException: Not a valid Unicode code point: 0x2388211 at java.base/java.lang.Character.toChars(Character.java:8573) at Demo.main(Demo.java:9)

Example

Let us see another scenario where the method throws a NullPointer Exception.

import java.lang.*; public class Demo < public static void main(String[] args) < int cp = 0x1271; int res; res = Character.toChars(cp, null, 0); if ( res == 1 ) < System.out.println("It is a BMP code point"); >else if ( res == 2 ) < System.out.println("It is a is a supplementary code point"); >> >

Exception

Let us compile and run the given program above, the output is obtained as follows – a NullPointerException is thrown −

Exception in thread "main" java.lang.NullPointerException at java.base/java.lang.Character.toChars(Character.java:8537) at Demo.main(Demo.java:11)

Источник

Java — convert char array to Character array

Abel-Burks

1. Overview

In this post we cover how to convert char[] to Character[] in 3 different ways.

char[] charArr = ; Character[] charArrBoxed = new String(charArr).chars() .mapToObj(c -> (char) c) .toArray(Character[]::new);

2. Using String().chars()

import java.util.Arrays; public class Example1 < public static void main(String[] args) < char[] charArr = ; Character[] charArrBoxed = new String(charArr).chars() .mapToObj(c -> (char) c) .toArray(Character[]::new); System.out.println(Arrays.toString(charArrBoxed)); // [a, b, c] > >

3. Using IntStream.range()

import java.util.Arrays; import java.util.stream.IntStream; public class Example2 < public static void main(String[] args) < char[] charArr = ; Character[] charArrBoxed = IntStream.range(0, charArr.length) .mapToObj(idx -> charArr[idx]) .toArray(Character[]::new); System.out.println(Arrays.toString(charArrBoxed)); // [a, b, c] > >

4. Using CharBuffer.wrap()

import java.nio.CharBuffer; import java.util.Arrays; public class Example3 < public static void main(String[] args) < char[] charArr = ; Character[] charArrBoxed = CharBuffer.wrap(charArr) .chars().mapToObj(i -> (char) i) .toArray(Character[]::new); System.out.println(Arrays.toString(charArrBoxed)); // [a, b, c] > >

Merged questions

Источник