Thread: Java Variable Conversions

Here is a handy reference guide to variable conversions. Feel free to add your own.

String to int

String myString = "420";
int myInt = Integer.parseInt(myString);

String to double

String myString = "42.0";
double myDouble = Double.parseDouble(myString);

String to long

String myString = "1000000000";
long myLong = Long.parseLong(myString);

String to boolean

String myString = "true";
boolean myBoolean = Boolean.parseBoolean(myString);

int to String

int myInt = 420;
String myString = new Integer(myInt).toString();

int to double

int myInt = 420;
double myDouble = (double)myInt;

int to boolean

int myInt = 0;
boolean myBoolean = (myInt != 0);

ASCII code to String

int myInt = 100;
String myString = new Character((char)myInt).toString();

double to String

double myDouble = 0.42;
String myString = Double.toString(myDouble);

double to int

double myDouble = 420.5;
int myInt = (int)myDouble;

char to String

char myChar = 'A';
String myString = Character.toString(myChar);

boolean to String

boolean myBoolean = true;
String myString = new Boolean(myBoolean).toString();

byte Array to String

byte[] byteArray = new byte[] {74, 65, 86, 65};
String value = new String(byteArray);

Hi

String.valueOf(...) is better for primitive types because there is no need to create new instance of wrapper Object.

Very very very very very helpful thank you

Here's my byteArray to string ^^

byte[] byteArray = new byte[] { put, your, bytes, here };
		String value = new String( byteArray );

here's one to try:

byte[] byteArray = new byte[] { 75, 111, 97, 107, 32,
					       79, 119, 110, 115, 32,
					       65, 108, 108 };
		String value = new String( byteArray );
		System.out.println( value );