Loops :
- Loops are used to execute a set of statements repeatedly until a particular condition is satisfied.
Types of Loops :
for loop: This executes a statement a particular number of times.
while loop: This executes a statement an unknown number of times.
do-while loop: This executes a statement at least one time.
The syntax for the "for" loop is :
for(Variable Initialization; Boolean_Expression Test; Increment/Decrement){
//Statements
}
Example :
package selenium;
public class Java_practise {
public static void main(String[] args) {
// This will print -- 0,1,2,3,4,5
for(int Increment = 0;Increment<=5;Increment++){
System.out.println("Count is ==> " + Increment );
}
// This will print -- 5,4,3,2,1,0
for(int Decrement = 5;Decrement>=0;Decrement--){
System.out.println("Count is ==> " + Decrement );
}
// This will print -- 0,2,4
for(int Increment = 0;Increment<=5;Increment+=2){
System.out.println("Skip every one another ==> " + Increment );
}
// This will print -- 0,1,2,3,4,5
for(int Count = 0;Count<=10;Count++)
{
if(Count==6){
break;
}
System.out.println("Count is ==> " + Count );
}
// This will just print -- 3
for(int Count = 0;Count<=5;Count++){
if(Count==3){
System.out.println("Count is ==> " + Count);
continue;
}
}
}
}
The syntax for the while loop :
while(Boolean_Expression Test){
//Statements
}
Example :
package selenium;
public class Java_practise {
public static void main(String[] args) {
int Count = 0;
// This will print -- 5,10,15,20,25
while(Count < 25){
Count = Count + 5;
System.out.println("Count is ==> "+ Count);
}
}
}
The syntax for the do-while loop :
do{
//Statements
}while(Boolean_Expression Test);
Example :
package selenium;
public class Java_practise {
public static void main(String[] args) {
int CountOnce = 25;
System.out.println("<==== Next Count ====>");
// This will just print once
do{
CountOnce = CountOnce + 5;
System.out.println("Count is ==> "+ CountOnce);
}while(CountOnce < 25);
}
}
The syntax for enhanced for loop :
for (data_type variable: array_name)
Examples :
package selenium;
public class Java_practise {
public static void main(String[] args) {
// Array of String storing days of the week
String days[] = { "Mon", "Tue", "Wed", "Thr", "Fri", "Sat", "Sun"};
// Enhanced for loop, this will automatically iterate on the array list
for (String dayName : days) {
System.out.println("Days ==> "+ dayName);
}
System.out.println("<==== Normal For Loop ====>");
// Normal for loop
for (int i=0; i < days.length; i++) {
System.out.println("Days ==> "+ days[i]);
}
}
}
