Three ways to convert String to char array in Java

Method 1: Use toCharArray()

The toCharArray() method is the most straightforward method, which can convert strings into character arrays.

public class StringToCharArrayExample {
    public static void main(String[] args) {
        String str = "Hello";
        char[] charArray = (); // Convert String to char array        
        // Output char array        for (char c : charArray) {
            (c + " ");
        }
    }
}

Output:

H e l l o 

Method 2: Use charAt() and loop

You can use the charAt() method to get the characters in the String one by one in a loop and then manually fill the character array.

public class StringToCharArrayExample {
    public static void main(String[] args) {
        String str = "Hello";
        char[] charArray = new char[()]; // Create a char array with the same length as the String        
        for (int i = 0; i < (); i++) {
            charArray[i] = (i); // Use charAt to get each character and fill the array        }
        
        // Output char array        for (char c : charArray) {
            (c + " ");
        }
    }
}

Output:

H e l l o 

Method 3: Use getChars() method

The getChars() method can copy characters of a specified range from a String into a character array.

public class StringToCharArrayExample {
    public static void main(String[] args) {
        String str = "Hello";
        char[] charArray = new char[()]; // Create a char array with the same length as the String        
        (0, (), charArray, 0); // Copy the string's characters into the char array        
        // Output char array        for (char c : charArray) {
            (c + " ");
        }
    }
}

Output:

H e l l o 

Summarize

• toCharArray(): The most direct way to convert the entire string into a character array.
• charAt() + loop: Get each character manually and put it into an array.
• getChars(): Copy characters in the specified range into the character array.

Attachment: char array to string

There are roughly 6 ways to convert char to String. The summary is as follows:

1. String s = ('c'); //The most efficient method

2. String s = (new char[]{'c'}); //Convert a char array to String

3. String s = ('c');

// The (char) method actually returns (char)

4. String s = new Character('c').toString();

5. String s = "" + 'c';

// Although this method is simple, it is the least efficient method
// The value of String Object in Java is actually immutable and is a final variable.
// So every time we make any changes to the String, we initialize a brand new String Object and point the original variable to this new String.
// Java overloads the method of using the + operator to handle String addition.
// The strings are added directly to the connection actually call the following method:
// new StringBuilder().append("").append('c').toString();

6. String s = new String(new char[]{'c'});

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