java learning (conditional expression)

Relational operators (comparison of strings)

if (str == "Book") {
if (str equals ("Book")) {

** The top is wrong. The bottom is correct. ** ** Even above (==), the compilation error does not occur, and there is a problem that it can be executed but sometimes it behaves strangely.

Logical operator

if (age >= 18 && month == 5) {

Age 18 and over, and born in May

if (name.equals("Saito") || name.equals("Saito")) {

The name is Saito, or Saito

Negation operator

if(!(age >= 18)) {

If you are over 18 and not

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