Selenium 12: Java Control Flow Statements

Java for Selenium, Java Control Flow Statements, Java Decision Making Statements, Java Looping Statements, and Java Branching Statements. Types of Conditional statements in Java, Types of conditions, and usage of conditional Statements in Java. Java for loop, while loop, do while loop, and enhanced for loop.

[gcreddy]

Class Notes:
Selenium Class 12: Java Control Flow Statements

i) Decision Making Statements
ii) Loop Statements
iii) Branching Statements

Java Logical Operators Example:

boolean a= true, b= false;
System.out.println(!(a && b));//true
System.out.println(a && b);//false
System.out.println(a || b);//true

Example 2:
int a =100, b=500, c=700;

if ((a>b) && (a>c)) {
System.out.println("A is a Big Number");
}
else
{
System.out.println("A is not a Big Number");
}

if ((a>b) || (a>c)) {
System.out.println("A is a Big Number");
}
else
{
System.out.println("A is not a Big Number");
}
}
}

int a =10, b=50, c=70;

if (!((a>b) && (a>c))) {
System.out.println("A is a Big Number");
}
else
{
System.out.println("A is not a Big Number");
}

i) Decision Making Statements

a) Two types of Statements
1) if statement
2) switch statement

b) Three Types of Conditions
1) Single Condition (Positive, Negative)

ex:
if (a>b) {
.
.
}

Negative Condition
if (b<a) {
.
.
}

if (!(b>a)) {
.
.
}

2) Compound Condition (Positive, Negative)

Ex:
if ((a>b) && (a>c)){
.
.
}

if ((a>b) || (a>c)){
.
.
}

if ((a>b) && (a>c) && (a>d)){
.
.
}

if ((a>b) && (a>c) || (a>d)){
.
.
}

3) Nested Condition
if(a>b){
if(a>c){
if(a>d){
.
.
}
}
}

c) Usage of Conditional Statements / Decision Making Statements

1) Execute a block of Statements when condition is true.

Syntax:

if (condition) {
Statements


}

Example:

int a =10, b=50;

if (a>b){
System.out.println("A is a Big Number");
}

int a =10, b=5;

if (b<a){
System.out.println("A is a Big Number");
}

int a =10, b=5;

if (!(b>a)){
System.out.println("A is a Big Number");
}

2) Execute a block of Statements when a compound condition is true

Syntax:
if && Or || (Condition2)) {
Statements
.
.
}

int a =10, b=7, c=4;

if ((a>b) && (a>c)){
System.out.println("A is a Big Number");
}

int a =10, b=7, c=40;

if ((a>b) || (a>c)){
System.out.println("A is a Big Number");
}

3) Execute a block of Statements when condition is true otherwise execute another block of Statements

if (condition) {
Statements


}
else
{
Statements


}

Example:

int a =10, b=10;

if (a>b) {
System.out.println("A is a Big Number");
}
else{
System.out.println("B is a Big Number");
}

4) Decide among several alternates(else if)

Syntax:

if (condition) {
Statements



}
else if (condition) {
Statements



}
else if (condition) {
Statements



}
else
{
Statements


}

Initialize an Integer Variable and verify the range

If the number is in between 1 and 100 then display "Number is a Small Number"
If the number is in between 101 and 1000 then display "Number is a Medium Number"
If the number is in between 1001 and 10000 then display "Number is a Big Number"
If the number is more than 10000 then display "Number is a High Number"
Otherwise display "Number is a either Zero or Negative Number"

Java Program:

int a = -100;

if ((a>0) && (a<=100)){
System.out.println("A is a Small Number");
}
else if ((a>100) && (a<=1000)){
System.out.println("A is a Medium Number");
}
else if ((a>1000) && (a<=10000)){
System.out.println("A is a Big Number");
}
else if (a>10000){
System.out.println("A is a High Number");
}
else
{
System.out.println("Number is either Zero or Negative Number");
}
}
}

5) Execute a block of Statements when more than one condition is true (nested if)

syntax:
if (condition){
if (condition){
if (condition){
Statements


}
}
}

Example:
Initialize a, b, c, and d variables (Integer variables), check if the a variable is bigger than other three variables or not?

int a=100, b=90, c=80, d=700;

if (a>b){
if (a>c){
if (a>d){
System.out.println("A is a Big Number");
}
}
}

int a=100, b=900, c=800, d=700;

if (a>b){
if (a>c){
if (a>d){
System.out.println("A is a Big Number");
}
else {
System.out.println("A is Not a Big Number-3rd condition is False");
}
}
else{
System.out.println("A is Not a Big Number-2nd condition is False");
}
}
else
{
System.out.println("A is Not a Big Number -1st condition is False");
}
}
}

Using Compound Condition

int a=100, b=90, c=80, d=70;

if ((a>b) && (a>c) && (a>d)){
System.out.println("A is a Big Number");
}
else
{
System.out.println("A is Not a Big Number");
}

Nested if Condition vs. Compound Condition

In Nested if condition we can write multiple else parts, where as in Compound Condition we can write single else part only.

Problem: Find the biggest variable (Integer variables) among 4 variables

Use Compound Condition and else if...

int a=100, b=90, c=80, d=700;

if ((a>b) && (a>c) && (a>d)){
System.out.println("A is a Big Number");
}
else if ((b>a) && (b>c) && (b>d)){
System.out.println("B is a Big Number");
}
else if ((c>a) && (c>b) && (c>d)){
System.out.println("C is a Big Number");
}
else {
System.out.println("D is a Big Number");
}
}
}

6) Decide among several alternates (using switch statement)

Syntax:

switch (expression) {

case value:
Statements


break;
case value:
Statements


break;
case value:
Statements


break;

default:
Statements


}

Example:

char grade = 'Z';

switch (grade){

case 'A':

break;

case 'B':
System.out.println("Good");
break;

case 'C':
System.out.println("Better");
break;

default:
System.out.println("Invalid Grade");
}

}
}

ii) Looping Statements

1) for loop
2) while loop
3) do while loop
4) Enhanced for loop

1) for loop

Description: It repeats a block of statements for a specified number of times,

Syntax:

for (Stratvalue; EndValue; Increment / Decrement){
Statements


}

Print 1 to 10 Numbers
Example:
for (int i=1; i<=10; i++){
System.out.println(i);
}

Print 1 to 5 Numbers except 4th Number

for (int i=1; i<=5; i++){

if (i != 4){
System.out.println(i);
}

}

Print 1 to 10 Numbers in reverse Order

for (int i=10; i>=1; i--){
System.out.println(i);
}

2) while loop

Description: It repeats a block of Statements while condition is true

Syntax:
initialization
while (condition){
Statements


Increment/Decrement
}

Examples:

1) Print 1 to 10 Numbers
2) Print 10 to 1 Numbers
3) Print 1 to 5 Numbers except 3rd number

int i=1;

while (i<=10){
System.out.println(i);
i++;
}

int i=10;

while (i>=1){
System.out.println(i);
i--;
}

int i=1;
while (i<=5){
if (i != 3){
System.out.println(i);
}
i++;
}

[TechWave]

sir!
Class notes please..

Thank you