Integer toString() in Java

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  1. The java.lang.Integer.toString() is an inbuilt method in Java which is used to return the String object representing this Integer’s value.

    Syntax :

    public static String toString()

    Parameters: The method does not accept any parameters.

    Return Value:The method returns the string object of the particular Integer value.

    Below program illustrates the Java.lang.Integer.toString() method:




    // Java program to illustrate the
    // toString() Method
    import java.lang.*;
      
    public class Geeks{
      
    public static void main(String[] args) {
      
        Integer obj = new Integer(8);
          
        //It will return a string representation     
        String stringvalue1 = obj.toString();
        System.out.println("String Value= " + 
                                stringvalue1);
          
          
            Integer obj3 = new Integer(10);
          
        //It will return a string representation 
        String stringvalue3 = obj3.toString();
        System.out.println("String Value = " + 
                                stringvalue3);
          
    }
    }
    		 

    

    

    

    

    

    

    Output:
    

    

    

    String Value= 8
String Value = 10

    

    

    2. 

  2. The java.lang.Integer.toString(int a) is an inbuilt method in Java which is used to return a String object, representing the specified integer in the parameter.
    Syntax :

    public static String toString(int a)
    

    Parameters: The method accepts one parameter a of integer type and refers to the integer needed to be converted to string.
    

    

    Return Value: The method returns the string representation of the argument in a particular base.
    

    Examples:
    

    For base 8: 
Input: int a = 75 
Output: "75"

For base 10:
Input: int a = -787 
Output: "-787"

    

    Below programs illustrate the Java.lang.Integer.toString(int a) method:
    Program 1:
    

    

    

    

    

    

    


    

    

    

    



    

    

    

    

    

    

    

    


    


    

    // Java program to illustrate the
    

    // toString(int a) method
    

    import java.lang.*;
    

      
    

    public class Geeks{
    

      
    

    public static void main(String[] args) {
    

      
    

        Integer obj = new Integer(8);
    

          
    

        // It will return a string representation
    

            // in base 8
    

        String stringvalue1 = obj.toString(75);
    

        System.out.println("String Value = " + 
    

                                stringvalue1);
    

          
    

        Integer obj2 = new Integer(8);
    

          
    

        // It will return a string representation
    

            // in base 2
    

        String stringvalue2 = obj2.toString(6787);
    

        System.out.println("String Value = " + 
    

                                stringvalue2);
    

          
    

          
    

            Integer obj3 = new Integer(10);
    

          
    

        // It will return a string representation 
    

            // in base 10
    

        String stringvalue3 = obj3.toString(-787);
    

        System.out.println("String Value = " + 
    

                                stringvalue3);
    

          
    

    }
    

    } 
    

    
    		

    
    

    

    

    

    

    

    

    

    

    

    

    

    

    

    Output:
    

    String Value = 75
String Value = 6787
String Value = -787

    

    

    Program 2: For decimal and string parameters.
    Note: This results in an error and as well for the absence of suitable Integer constructor.
    

    

    

    

    

    

    


    

    

    

    



    

    

    

    

    

    

    

    


    


    

    // Java program to illustrate the
    

    // Java.lang.Integer.toString(int a)method
    

    import java.lang.*;
    

    public class Geeks{
    

      
    

    public static void main(String[] args) {
    

        Integer obj = new Integer(8);    
    

        String stringvalue1 = obj.toString(58.5);
    

        System.out.println("String Value = " + 
    

                                stringvalue1);
    

          
    

        Integer obj2 = new Integer(8);    
    

        String stringvalue2 = obj2.toString("317");
    

        System.out.println("String Value = " + 
    

                                stringvalue2);
    

          
    

          
    

        // Empty constructor will result in an error
    

        Integer obj3 = new Integer();
    

        String stringvalue3 = obj3.toString(-787);
    

        System.out.println("String Value = " + 
    

                                stringvalue3);
    

          
    

    }
    

    } 
    

    
    		

    
    

    

    

    

    

    

    

    

    

    

    

    

    

    

    Output:
    

    prog.java:8: error: incompatible types: possible 
lossy conversion from double to int
    String stringvalue1 = obj.toString(58.5);
                                       ^
prog.java:12: error: incompatible types: String cannot 
be converted to int
    String stringvalue2 = obj2.toString("317");
                                        ^
prog.java:17: error: no suitable constructor found for 
Integer(no arguments)
    Integer obj3 = new Integer();
                   ^
    constructor Integer.Integer(int) is not applicable
      (actual and formal argument lists differ in length)
    constructor Integer.Integer(String) is not applicable
      (actual and formal argument lists differ in length)
Note: Some messages have been simplified; recompile with 
-Xdiags:verbose to get full output
3 errors
    

    3. 

  3. The java.lang.Integer.toString(int a, int base) is an inbuilt method in Java which is used to return a string representation of the argument a in the base, specified by the second argument base. If the radix/base is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the base 10 is used. The ASCII characters which are used as digits: 0 to 9 and a to z.
    Syntax:

    public static String toString(int a, int base)
    

    Parameter: The method accepts two parameters:
    

      

    • a: This is of integer type and refers to the integer value that is to be converted.
      • 

    • base: This is also of integer type and refers to the base that is to be used while representing the strings.
      • 

    

    Return Value: The method returns a string representation of the specified argument in the specified base.
    

    Examples:
    

    Input: a = 71, base = 2
Output: 1000111

Input: a = 314, base = 16
Output: 13a

    

    Below programs illustrate the Java.lang.Integer.toString(int a, int base) Method:
    Program 1:
    

    

    

    

    

    

    


    

    

    

    



    

    

    

    

    

    

    

    


    


    

    // Java program to illustrate the
    

    // toString(int, int) Method
    

    import java.lang.*;
    

      
    

    public class Geeks{
    

      
    

    public static void main(String[] args) {
    

      
    

            Integer a = new Integer(10);
    

          
    

        // It returns a string representation 
    

            // in base 2
    

        String returnvalue = a.toString(5254, 2);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

      
    

        // It returns a string representation 
    

            // in base 8
    

        returnvalue = a.toString(35, 8);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

      
    

        // It returns a string representation 
    

            // in base 16
    

        returnvalue = a.toString(47, 16);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

      
    

        // It returns a string representation 
    

            // in base 10
    

        returnvalue = a.toString(451, 10);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

    }
    

    } 
    

    
    		

    
    

    

    

    

    

    

    

    

    

    

    

    

    

    

    Output:
    

    String Value = 1010010000110
String Value = 43
String Value = 2f
String Value = 451

    

    

    Program 2:
    

    

    

    

    

    

    


    

    

    

    



    

    

    

    

    

    

    

    


    


    

    // Java program to illustrate the
    

    // toString(int, int) Method
    

    import java.lang.*;
    

      
    

    public class Geeks{
    

      
    

    public static void main(String[] args) {
    

      
    

            Integer a = new Integer(10);
    

          
    

        // It returns a string representation 
    

            // in base 2
    

        String returnvalue = a.toString(-525, 2);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

      
    

        // It returns a string representation 
    

            // in base 8
    

        returnvalue = a.toString(31, 8);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

      
    

        // It returns a string representation 
    

            // in base 16
    

        returnvalue = a.toString(28, 16);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

      
    

        // It returns a string representation 
    

            // in base 10
    

        returnvalue = a.toString(29, 10);
    

        System.out.println("String Value = " + 
    

                                returnvalue);
    

    }
    

    } 
    

    
    		

    
    

    

    

    

    

    

    

    

    

    

    

    

    

    

    Output:
    

    String Value = -1000001101
String Value = 37
String Value = 1c
String Value = 29

    

    

    

    4. 





			
		


				

			

				

						
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