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

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.         
9.         
10.  Integer i = new Integer(64);
11.         
12.  //converting integer to string by calling toString() method on integer object
13.  
14.   String str= i.toString();
15.   // also we can use like String str= Integer.toString(i);
16. 
    
17.  System.out.println(str);
18.  
19. }
20.  
21. }

 Output:

1. 64

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.

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.   Integer i = new Integer(64);       
10.  
11.  //converting integer to string by calling valueOf() method on String clas
12.   String str= String.valueOf(i);
13.         
14.   System.out.println(str);
15.         
16.         
17.   int number=123;
18.   String numberstr= String.valueOf(number);
19.         
20.   System.out.println(numberstr);     
21.      
22. }
23.  
24. }

 Output:

1. 64
2. 123

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()

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.   int number=23;
10.  
11.  String numberstr=    new Integer(number).toString();
12.         
13.  System.out.println(numberstr);
14.      
15. }
16.  
17. }

 Output:

1. 23

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

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.   int number=23;
10.  
11.  String numberstr=   String.format ("%d", number);
12.         
13.  System.out.println(numberstr);
14.      
15. }
16.  
17. }

 Output:

1. 23

 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

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.   int number=23;
10.        
11.   DecimalFormat obj= new DecimalFormat("#");
12.         
13.   String numberstr=    obj.format(number);
14.         
15.   System.out.println(numberstr);
16.         
17.         
18. DecimalFormat objct= new DecimalFormat("#,###");
19.         
20. String numberstr1=    objct.format(3400);
21.         
22. System.out.println(numberstr1);
23.      
24. }
25.  
26. }

 Output:

1. 23
2. 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

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.     int number=234;     
10.    
11.     StringBuffer sf=new StringBuffer();
12.     sf.append(number);
13.     String numberstr=    sf.toString();
14.         
15.    System.out.println(numberstr);
16.         
17.         
18.     StringBuilder sb=new StringBuilder();
19.     sb.append(number);
20.     String nstr=    sb.toString();
21.             
22.     System.out.println(nstr);     
23. }
24.  
25. }

 Output:

1. 234
2. 234

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 ""

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.   int number=8538;
10.  
11.  String numberstr=   ""+number;
12.         
13.  System.out.println(numberstr);
14.      
15. }
16.  
17. }

 Output:

1. 8538

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


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

1. package convertintegertostring.java;
2. public class IntegerToString {
3.  
4.     /**
5.      * @ website: www.InstanceOfJava.com
6.      */
7. public static void main(String[] args) {
8.  
9.  int number=536;
10.  
11.    String binaryString = Integer.toBinaryString(number);
12.    System.out.println(binaryString);
13.         
14.    String octalString = Integer.toOctalString(number);
15.    System.out.println(octalString);
16.     
17.    String hexString = Integer.toHexString(number);
18.    System.out.println(hexString);
19.         
20.    String customString = Integer.toString(number, 7);
21.    System.out.println(customString);
22.  
23. } 
24. 
    
25. }

 Output:

1. 1000011000
2. 1030
3. 218
4. 1364

8 different ways to convert int to string in java

 Output:

1. 64
2. 64
3. 536
4. 536
5. 3,400
6. 536
7. 536
8. 1000011000