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2-Operators-and-Statements.md

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theme: Plain Jane autoscale: true

Operators and statements

Numeric promotion

  • int + long == long
  • int+ float == float
  • byte, short, char --> promote to int always

Byte woes

byte b1 = 1;
byte b2 = 1 + b1;	// error

---

byte b1 = 1;
byte b2 = (byte)(1 + b1);

Byte woes

byte b3 = b1++;				// OK	
b1 = b1 += 1;				// OK
b1 = b1 + 1;				// error
System.out.println(b1 + 1);	// OK  ¯\_(ツ)_/¯

Assignment

= no es ==

int i = 10;
long l = 10;
double d = 10.9;
float f = 10.0;

Binary arithmetic operators

Unary operators

  • +, -, ++, --
  • postfix & prefix ++

instanceof no entra en el examen

Logical operators

  • |, &, !: int / boolean
  • ||, &&: short-circuit operators

Ternary operator ?

if-then-else

  • curly braces not mandatory
int x = 0;
if (x == 10) {
	x = 11;
} else {
	x == 10;
}
// value of x?

if-then-else

int x = 0;
if (x == 10)
	x = 11;
	x--;
	else 
	x = 10;

switch

int x = 0;
switch (x) {
	case 10:
	case 7:
	case 4:
		break;
	default:
		
}

switch

String name = "spongebob";
switch (name) {
	case "spongebob":
	case "7":
	case "PatrickStar":
		break;
	default:

}

el resto: a leer