if-else & compound Statements

if (Boolean_expression) && (Boolean)
{
	statement_1
}
else if (Boolean_expression) // (Boolean)
{
	statement_2
}
else 
{
	statement_3
}

swtich Statement

char grade;
int score = scanner.nextInt();
switch (score/10  // char, int, short, byte, String) {    
	case 10:
    case 9:
    	grade = 'A';
        break;
    case 8:
    	grade = 'B';
        break;
    case 7:
    	grade = 'C'; 
        break; 
        
        ...
        
    default:
    	grade = 'F'; 
}
System.out.println("학점은" + grade + "입니다."); 

conditional operator

int x = 5;
int y = 3; 
int s;
if (x > y)
	s = 1; 
else 
	s = -1;

아래와 동일!!

int s = (x > y) ? 1 : -1 ; 

java comparison operators

== !=. > >= < <=

using == with Strings, equals & equalsIgnoreCase

String str1 = "Korea"
String str2 = str1 ;
String str3 = "Korea";
String str4 = new String("Korea"); 
String str5 = "KOREA"; 

str1 == str2 // T
str1 == str3 // T
str1 == str4 // F
str1 == str5 // F

str1.equals(str4) // T
str1.equalsIgnoreCase(str5) // T

Order of String

사전식 뒤에있으면 양수

String str1 = "adventure123"; 
str1.compareTo("zoo"); // 음수
str1.compareTo("adventure123"); // 0
str1.compareTo("5555"); // 양수
str1.compareTo("above") // 양수
str1.compareTo("ADVENTURE123"); // 양수 
str1.compareToIgnoreCase("ADVEnture123"); // 0

Precedence & Associativity Rules