How to convert long to String in Java

java

There are many scenarios where we may be required to convert a long to a String. This post will discuss how we can convert a long integer to a string type in Java.

Let’s look at all the above methods one by one.

Long.toString() method

Java has a Long wrapper class, so we can perform class operations on the long primitive type. The Long class provides a static toString() method that can covert a long primitive value into its corresponding String object.

Declaration of toString() method

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public static String toString(long i)

To convert long into String, we have to write the following line.

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String str = Long.toString(longValue);

The whole program of converting long to String is shown below.

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public class Codekru {
 
    public static void main(String[] args) {
        long l = 3051234567L;
        String str = Long.toString(l);
        System.out.println(str instanceof String); // will print true
        System.out.println(str); // will print "3051234567"
    }
}

Output – 

true
3051234567

So, here we have converted a long primitive into a String which is also proved by the instanceOf method.

String.ValueOf() method

String class also has a static valueOf() method, which will take a long primitive as an argument and return a String object. Below is the declaration of valueOf() method.

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public static String valueOf(long l)

Do you know that String .valueOf() method internally uses Long.toString() method.

The internal implementation of String.valueOf() function

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public static String valueOf(long l) {
    return Long.toString(l);
}

And Below is an example where we have converted a long primitive value to a String using the valueOf() method.

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public class Codekru {
 
    public static void main(String[] args) {
        long l = 3051234567L;
        String str = String.valueOf(l);
 
        System.out.println(str instanceof String); // will print true
        System.out.println(str); // will print "3051234567"
    }
}

Output – 

true
3051234567

Using + operator

We can directly convert the long to a String using the + operator. Yes, it’s that easy 😛

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public class Codekru {
 
    public static void main(String[] args) {
        long l = 3051234567L;
        String str = "";
        str = str + l + ""; // acting as a string concatenation operator here
        System.out.println(str instanceof String); // will print true
        System.out.println(str); // will print "3051234567"
    }
}
true
3051234567

Using StringBuffer or StringBuilder append() function

We can also use the append() function in StringBuilder and StringBuffer classes to convert long to a String.

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public class Codekru {
 
    public static void main(String[] args) {
        long l = 3051234567L;
        String str = new StringBuffer().append(l).toString();
        System.out.println(str instanceof String); // will print true
        System.out.println(str); // will print "305"
    }
}

Output – 

true
3051234567

String.format() method

Besides using the valueOf() method, we can also use the static format() method to convert long into its corresponding string.

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public class Codekru {
 
    public static void main(String[] args) {
        long l = 3051234567L;
 
        String str = String.format("%d", l);
        System.out.println(str);
 
    }
}

Output –

3051234567

Hope you liked the article. If you have any doubts or concerns, please feel free to write us in the comments or mail us at admin@codekru.com.

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