Java Buzz Forum - 8 different ways to convert int to String in java

How to convert string to int or integer to string in java?
When we are working on a project we will be having some scenarios of expecting a string from int or integer from string.
Now we will be discussing on how to convert Integer to String in java with example java programs.

8 different ways to convert int to String in java

1.Convert Integer to String using Integer.toString() method:
2.Convert Integer to String using String.valueOf() method.
3.Convert Integer / int to String using new Integer(int).toString()
4.Convert Integer / int to String using String.format() method
5.Convert Integer / int to String using DecimalFormat
6.Convert Integer / int to String using StringBuffer / StringBuilder
7.Convert Integer / int to String directly by adding to ""
8.Convert Integer / int to String using Special radix.

1.Convert Integer to String using Integer.toString() method:

Integer is a wrapper class in java which is mainly used to represent or convert primitive int value to object.
And Integer class having some predefined methods.
Integer class has special predefined method to convert integer value to string toString();
toString is a static method in Integer class so that by using class name itself we can call that method to convert Integer to corresponding string value.

Program #1: Java Example program to convert Integer to String by using toString() method:

Output:

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
Integer i = new Integer(64);
//converting integer to string by calling toString() method on integer object
String str= i.toString();
// also we can use like String str= Integer.toString(i);
System.out.println(str);
}
}

Output:

2.Convert Integer to String using String.valueOf() method.

Integer class have toString() method to convert integer to string value same way String class also has valueOf() method to convert int or integer to string.
String class has a static method valueOf() which takes int as argument and converts into string.

Program #2: Java Example program to convert int to string using valueOf() method.

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
Integer i = new Integer(64);
//converting integer to string by calling valueOf() method on String clas
String str= String.valueOf(i);
System.out.println(str);
int number=123;
String numberstr= String.valueOf(number);
System.out.println(numberstr);
}
}

Output:

3.Convert Integer / int to String using new Integer(int).toString()

And here by creating Integer object and directly calling tostring method.
We can convert into to string directly with one statement this will be done by using Integer(int).toString()

Program #3: Java Example program to convert int to string using new Integer(int ).toString()

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
int number=23;
String numberstr= new Integer(number).toString();
System.out.println(numberstr);
}
}

Output:

4.Convert Integer / int to String using String.format() method

Another alternative way to convert int t string is by calling String.format method.
String.format ("%d", number);

Program #4: Java Example program to convert int to string using String.format() method

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
int number=23;
String numberstr= String.format ("%d", number);
System.out.println(numberstr);
}
}

Output:

5.Convert Integer / int to String using DecimalFormat

Another alternative way to convert int t string is by java.text.DecimalFormat
DecimalFormat class mainly used to represent numbers in formats.
Decimal format class providing format() method to convert int to string with specified format.

Program #5: Java Example program to convert int to string using DecimalFormat class

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
int number=23;
DecimalFormat obj= new DecimalFormat("#");
String numberstr= obj.format(number);
System.out.println(numberstr);
DecimalFormat objct= new DecimalFormat("#,###");
String numberstr1= objct.format(3400);
System.out.println(numberstr1);
}
}

Output:

23
3,400

6.Convert Integer / int to String using StringBuffer / StringBuilder

StringBuffer and StringBuilder classes also providing toString() method to convert int to string

Program #6: Java Example program to convert int to string using StringBuffer and StringBuilder

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
int number=234;
StringBuffer sf=new StringBuffer();
sf.append(number);
String numberstr= sf.toString();
System.out.println(numberstr);
StringBuilder sb=new StringBuilder();
sb.append(number);
String nstr= sb.toString();
System.out.println(nstr);
}
}

Output:

7.Convert Integer / int to String directly by adding to ""

We can convert a number to string simply by concatenating to "".
But it is not recommended to use.

Program #7: Java Example program to convert int to string by concat to ""

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
int number=8538;
String numberstr= ""+number;
System.out.println(numberstr);
}
}

Output:

8538

8.Convert Integer / int to String using Special radix.

Program #8: Java Example program to convert int to string using special radix

package convertintegertostring.java;
public class IntegerToString {
/**
* @ website: www.InstanceOfJava.com
*/
public static void main(String[] args) {
int number=536;
String binaryString = Integer.toBinaryString(number);
System.out.println(binaryString);
String octalString = Integer.toOctalString(number);
System.out.println(octalString);
String hexString = Integer.toHexString(number);
System.out.println(hexString);
String customString = Integer.toString(number, 7);
System.out.println(customString);
}
}

Output:

1000011000
1030
218
1364

8 different ways to convert int to string in java

Output:

64
64
536
536
3,400
536
536
1000011000


	Web Artima.com