Java Selection Structure if

if conditional statements are divided into three syntax formats, each of which has its own characteristics

1.if statements

An If statement is a sort of processing if a condition is met

Formula:

if (conditional statement) {

Execute the statement;

......

}

 1  public  class   pd{ 2   Public  static  void   main (string[] args) { 3  int  time = 5;  4  if  (Time<7" { 5  System.out.println ("The alarm is ringing, it's time to get up!") " 6  }  7  }  8 } 

Result: The output alarm will be ringing, it's time to get up!

2.if...else statements

if (judging condition) {

EXECUTE Statement 1

......

}else{

EXECUTE Statement 2

......

}

1  Public classPd {2 3      Public Static voidMain (string[] args) {4         intA = 4,b = 7;//define two int integer variables5         intMax;6         if(a>b) {7Max =A;8}Else{9Max =b;Ten System.out.println (max); One         } A     }       -}

Result: The output will be 7

3.if...else if...else Statements

if (judging condition 1) {

EXECUTE Statement 1

} else if (judging condition 2) {

EXECUTE Statement 2

}

...

else if (judging condition N) {

EXECUTE statement N

} else {

Execute Statement n+1

}

1  Public classpd{2      Public Static voidMain (string[] args) {3         intScore = 103;4         if(Score>=90 && score<=100){5System.out.println ("excellent");6}Else if(Score>=60 && score<90){7SYSTEM.OUT.PRINTLN ("Qualified");8}Else if(Score>=0 && score<60){9System.out.println ("Failed");Ten}Else{ OneSYSTEM.OUT.PRINTLN ("Error or exception"); A         } -     } -}

Result: Error or exception is output

Java Selection Structure if