Java - String representation of primitive data types

Description

The following table lists the string representation of the values of the primitive data types.

Data Type	Value	String Representation
int, short,	1234	"1234"
byte, long	0	"0"
char	'A'	"A"
char	'\u0041'(Unicode escape sequence)	"A"
boolean	true	"true"
boolean	false	"false"
float	2.5	"2.5"
float	0.0F	"0.0"
float	-0.0F	"-0.0"
float	Float.POSITIVE_INFINITY	"Infinity"
float	Float.NEGATIVE_INFINITY	"-Infinity"
float	Float.NaN	"NaN"
double	12.34	"12.34"
double	0.0	"0.0"
double	-0.0	"-0.0"
double	Double.POSITIVE_INFINITY	"Infinity"
double	Double.NEGATIVE_INFINITY	"-Infinity"
double	Double.NaN	"NaN"

Demo

public class Main {
  public static void main(String[] args) {
    boolean b1 = true; 
    boolean b2 = false; 
    int num = 365; 
    double d = -0.0; 
    char c = 'A'; 
    String str1; //from w w  w.  j  a  v  a2 s .co m
    String str2 = null; 
      
    str1 = b1 + " aaa";  
    System.out.println(str1);
    str1 = b2 + " bbb"; 
    
    System.out.println(str1);
    str1 = str2 + " and void"; 
      
    str1 = num + " days";
    System.out.println(str1);
    str1 = d + " zero";   
    System.out.println(str1);
      
    str1 = Double.NaN + " is Double.NaN";
    System.out.println(str1);
      
    str1 = c + " is a letter";
    System.out.println(str1);
    str1 = "This is " + b1;  
    System.out.println(str1);
      
    str1 = "Float.POSITIVE_INFINITY: " + Float.POSITIVE_INFINITY;
    System.out.println(str1);

  }
}

Result

null reference

If a String variable contains the null reference, the concatenation operator uses a string "null".

Demo

public class Main {
  public static void main(String[] args) {
    String str1 = "book2s.com"; 
    String str2 = null; /*from   ww  w. j ava2  s .co m*/

    String str3 = str1+ str2; 
    System.out.println(str3);
  }
}

Result

Related Topic

• String Concatenation Operator +

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