java-intro-casting.java

// With numeric types, you can automatically cast from smaller types
int tenInt = 10;
long tenLong = tenInt;

// Otherwise use  (TYPE) newValue
double someDouble = 1.234;
int someInt = (int) someDouble;
System.out.println(someInt); // 1

// Most numeric types have methods to convert to string
String piStr = Double.toString(3.14);
System.out.println(piStr);

// Similarly, you can convert strings to numeric types
int intFromStr = Integer.parseInt("20000");
float floatFromStr = Float.parseFloat("1.68");
boolean boolFromStr = Boolean.parseBoolean("true");
byte byteFromStr = Byte.parseByte("42");
System.out.println(intFromStr);
System.out.println(floatFromStr);
System.out.println(boolFromStr);
System.out.println(byteFromStr);