Java String valueOf()

The String.valueOf() method in Java is a multipurpose static method. Its major function lies in the conversion of types of data, such as primitive types and objects, into strings. The technique provides an efficient and convenient way to construct string objects from different sources.

Java's valueOf() method is overloaded with numerous forms, each of that is designed to handle specific data types. It can handle converting boolean, char, char array, double, float, int, long, and Object types into their respective string representations.

With the help of valueOf(), developers can get back string representations of variables and objects without the need to concatenate or modify strings directly. It simplifies the code and enhances readability by offering a cleaner option instead of string conversion with the hands.

Internal implementation

 public static String valueOf(Object obj) {
        return (obj == null) ? "null" : obj.toString();
    }

Method Signature

The signature or syntax of string valueOf() method is given below:

public static String valueOf(boolean b)
public static String valueOf(char c)
public static String valueOf(char[] c)
public static String valueOf(int i)
public static String valueOf(long l)
public static String valueOf(float f)
public static String valueOf(double d)
public static String valueOf(Object o)

Returns

String representation of a given value.

Java String valueOf() Method Example

StringValueOfExample.java

public class StringValueOfExample{
public static void main(String args[]){
int value=30;
String s1=String.valueOf(value);
System.out.println(s1+10);//concatenating string with 10
}}

Output:

Java String valueOf(boolean bol) Method Example

This is a boolean version of overloaded valueOf() method. It takes boolean value and returns a string. Let's see an example.

StringValueOfExample.java

public class StringValueOfExample {
    public static void main(String[] args) {
        // Example boolean value
        boolean isJavaFun = true;
        // Using valueOf(boolean bol) to convert boolean to String
        String boolString = String.valueOf(isJavaFun);
        // Displaying the result
        System.out.println("The boolean value is: " + isJavaFun);
        System.out.println("String representation using valueOf: " + boolString);
    }
}

Output:

The boolean value is: true
String representation using valueOf: true

Java String valueOf(char ch) Method Example

This is a char version of overloaded valueOf() method. It takes char value and returns a string. Let's see an example.

StringValueOfExample.java

public class StringValueOfExample {
    public static void main(String[] args) {
        // Example char value
        char myChar = 'A';
        // Using valueOf(char ch) to convert char to String
        String charString = String.valueOf(myChar);
        // Displaying the result
        System.out.println("The char value is: " + myChar);
        System.out.println("String representation using valueOf: " + charString);
    }
}

Output:

The char value is: A
String representation using valueOf: A

Java String valueOf(float f) and valueOf(double d) Method

It is a float version of the overloaded valueOf() method. It takes a float value and returns a string. Let's see an example.

StringValueOfExample.java

public class StringValueOfExample {
    public static void main(String[] args) {
        // Example float value
        float myFloat = 123.45f;
        // Example double value
        double myDouble = 987.654;
        // Using valueOf(float f) to convert float to String
        String floatString = String.valueOf(myFloat);
        // Using valueOf(double d) to convert double to String
        String doubleString = String.valueOf(myDouble);
        // Displaying the results
        System.out.println("Float value and its String representation: " + myFloat + " -> " + floatString);
        System.out.println("Double value and its String representation: " + myDouble + " -> " + doubleString);
    }
}

Test it Now

Output:

Float value and its String representation: 123.45 -> 123.45
Double value and its String representation: 987.654 -> 987.654

Java String valueOf() Complete Examples

Let's see an example where we are converting all primitives and objects into strings.

StringValueOfExample.java

public class StringValueOfExample {
    public static void main(String[] args) {
        // Primitive types
        boolean myBoolean = true;    // Example boolean value
        char myChar = 'A';           // Example char value
        int myInt = 42;              // Example int value
        long myLong = 123456789L;    // Example long value
        float myFloat = 123.45f;     // Example float value
        double myDouble = 987.654;   // Example double value
        // Objects
        Object myObject = new Object();          // Example Object
        Integer myIntegerObject = 123;           // Example Integer object
        Double myDoubleObject = 456.789;         // Example Double object
        // Using valueOf() to convert various types to String
        String booleanString = String.valueOf(myBoolean);          // Convert boolean to String
        String charString = String.valueOf(myChar);               // Convert char to String
        String intString = String.valueOf(myInt);                 // Convert int to String
        String longString = String.valueOf(myLong);               // Convert long to String
        String floatString = String.valueOf(myFloat);             // Convert float to String
        String doubleString = String.valueOf(myDouble);           // Convert double to String
        String integerObjectString = String.valueOf(myIntegerObject); // Convert Integer object to String
        String doubleObjectString = String.valueOf(myDoubleObject);  // Convert Double object to String
        // Displaying the results
        System.out.println("Boolean: " + booleanString);
        System.out.println("Char: " + charString);
        System.out.println("Int: " + intString);
        System.out.println("Long: " + longString);
        System.out.println("Float: " + floatString);
        System.out.println("Double: " + doubleString);
        System.out.println("Integer Object: " + integerObjectString);
        System.out.println("Double Object: " + doubleObjectString);
    }
} 

Output:

Boolean: true
Char: A
Int: 42
Long: 123456789
Float: 123.45
Double: 987.654
Integer Object: 123
Double Object: 456.789

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Java String valueOf()

Internal implementation

Method Signature

Returns

Java String valueOf() Method Example

Java String valueOf(boolean bol) Method Example

Java String valueOf(char ch) Method Example

Java String valueOf(float f) and valueOf(double d) Method

Java String valueOf() Complete Examples

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Java String valueOf()

Internal implementation