Several common ways to convert arrays and Strings in Java

In Java, arrays andStringThe mutual conversion between them is a common requirement. Below are several common arrays andStringMethods of conversion between:

1. Convert character array (char[]) and string (String) to each other

Character array to string

To convert a character array to a string, you can useStringClass constructor:

public class CharArrayToString {
    public static void main(String[] args) {
        char[] charArray = {'J', 'a', 'v', 'a'};
        
        // Convert character array to string        String str = new String(charArray);
        
        (str);  // Output: "Java"    }
}

String to character array

To convert a string to a character array, you can useStringClassictoCharArray()method:

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

2. Convert string array (String[]) and string (String) to each other

String array to string

Can be used()Method, or use()Method converts a string array into a string.()Allows to specify connectors, and()Just convert the array into a comma-separated string.

import ;

public class StringArrayToString {
    public static void main(String[] args) {
        String[] strArray = {"Java", "Python", "C++"};
        
        // Use () to convert an array to a string, specify a separator        String joinedString = (", ", strArray);
        (joinedString);  // Output: "Java, Python, C++"        
        // Use () to convert to a string (including brackets and commas)        String arrayString = (strArray);
        (arrayString);  // Output: "[Java, Python, C++]"    }
}

String to string array

To convert a string into an array of strings, you can use()Methods are usually split according to a certain separator.

public class StringToStringArray {
    public static void main(String[] args) {
        String str = "Java,Python,C++";
        
        // Use split() method to split strings according to commas        String[] strArray = (",");
        
        // Output string array        for (String s : strArray) {
            (s);  // Output: Java, Python, C++        }
    }
}

3. Convert integer array (int[]) and string (String) to each other

Integer array to string

Can be used()Method converts an array of integers to a string, or useStringBuilderManually construct strings:

import ;

public class IntArrayToString {
    public static void main(String[] args) {
        int[] intArray = {1, 2, 3, 4, 5};
        
        // Use () to convert an array of integers to a string        String str = (intArray);
        (str);  // Output: "[1, 2, 3, 4, 5]"    }
}

String to integer array

Can be used()Method splits the string by delimiter and converts each part into an integer:

public class StringToIntArray {
    public static void main(String[] args) {
        String str = "1,2,3,4,5";
        
        // Use split() method to split strings        String[] strArray = (",");
        
        // Convert each string to an integer and save it into an array of integers        int[] intArray = new int[];
        for (int i = 0; i &lt; ; i++) {
            intArray[i] = (strArray[i]);
        }
        
        // Output integer array        for (int num : intArray) {
            (num + " ");  // Output: 1 2 3 4 5        }
    }
}

4. Convert byte array (byte[]) and string (String) to each other

Byte array to string

Can be usedStringThe constructor of the class, converting the byte array into a string:

public class ByteArrayToString {
    public static void main(String[] args) throws Exception {
        byte[] byteArray = {74, 97, 118, 97};  // ASCII value corresponding to "Java"        
        // Convert byte array to string        String str = new String(byteArray, "UTF-8");
        
        (str);  // Output: "Java"    }
}

String to byte array

Can be usedStringClassicgetBytes()Method converts strings into byte arrays:

public class StringToByteArray {
    public static void main(String[] args) throws Exception {
        String str = "Java";
        
        // Convert string to byte array        byte[] byteArray = ("UTF-8");
        
        // Output byte array        for (byte b : byteArray) {
            (b + " ");  // Output byte value        }
    }
}

5. Convert integers (int) and strings (String) to each other

Integer to string

Can be used()or()method:

public class IntToString {
    public static void main(String[] args) {
        int num = 123;
        
        // Use () to convert integers to strings        String str1 = (num);
        
        // Use () to convert integers to strings        String str2 = (num);
        
        (str1);  // Output: "123"        (str2);  // Output: "123"    }
}

String to integer

Can be used()or()method:

public class StringToInt {
    public static void main(String[] args) {
        String str = "123";
        
        // Use () to convert a string to an integer        int num = (str);
        
        (num);  // Output: 123    }
}

Summarize

Character array and string transfer:usenew String(char[])ortoCharArray()。
String array and string transfer:use()or()。
Integer array and string:use()Or manually convert.
Byte array and string:usenew String(byte[])orgetBytes()。
Integer and string:use()or()。

These methods can help you efficiently convert arrays and strings in Java.

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