loops.md

For

For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations are known in advance.

Syntax

for(Initialization; Condition; Increment/decrement){  
//code  
} 

Example

public class ForExample {
    public static void main(String[] args) {
      for (int i = 1; i <= 5; i++) {
        System.out.println(i);
      }
    }
}

Check Result here

While

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

Syntax

while(condition){  
//code 
}  

Example

public class WhileExample {
    public static void main(String[] args) {
      int i=1;
      while ( i <= 5) {
        System.out.println(i);
        i++;
      }
    }
}

Check result here

Do-while

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

Syntax

do{  
//code 
}while(condition); 

Example

public class DoWhileExample {
    public static void main(String[] args) {
      int i=1;
      do {
        System.out.println(i);
        i++;
      } while (i<=5);
    }
}

Check result here

For Each

For each loop is used exclusively to loop through elements in an array. Usually for each loop is preferred when you want just values only in less amount of code.

Syntax

for (type variableName : arrayName) {
  // code 
} 

Example

public class ForExample {
    public static void main(String[] args) {
        String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
        for (String car : cars) {
            System.out.println(car);
        }
    }
}

Check Result here