Convert data type X into type Y in Java

DataType Conversion:

The examples below show how to convert between different data types in Java.

integer to String :

 int i = 42; \\ String str = Integer.toString(i); 

 or

 String str = "" + i;

double to String :

 String str = Double.toString(d);

long to String :

 String str = Long.toString(l);

float to String :

 String str = Float.toString(f);

String to integer :

 str = "25";\\  int i = Integer.valueOf(str).intValue();

 or

 int i = Integer.parseInt(str);

String to double :

 double d = Double.valueOf(str).doubleValue();

String to long :

 long l = Long.valueOf(str).longValue();

 or

 long l = Long.parseLong(str);

String to float :

 float f = Float.valueOf(str).floatValue();

decimal to binary :

 int i = 42;\\  String binstr = Integer.toBinaryString(i);

decimal to hexadecimal :

 int i = 42;\\  String hexstr = Integer.toString(i, 16);

 or

 String hexstr = Integer.toHexString(i);

 or (with leading zeroes and uppercase)

   public class Hex {

      public static void main(String args[]){

          int i = 42;

          System.out.print

              (Integer.toHexString( 0x10000 | i).substring(1).toUpperCase());

      }

  }

hexadecimal (String) to integer :

 int i = Integer.valueOf("B8DA3", 16).intValue();

 or

 int i = Integer.parseInt("B8DA3", 16);

ASCII code to String:

 int i = 64;\\  String aChar = new Character((char)i).toString();

integer to ASCII code (byte):

 char c = 'A';\\  int i = (int) c; // i will have the value 65 decimal

To extract ASCII codes from a String:

  String test = "ABCD";

  for ( int i = 0; i < test.length(); ++i ) {

      char c = test.charAt( i );

      int i = (int) c;

      System.out.println(i);

 }

integer to boolean:

 b = (i != 0);

boolean to integer:

 i = (b)?1:0;

float to double

 float f = (float)d;

double to float

 double d = f;  //no explicit typecast needed

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