If-Else Statement

In Java, if-else statements are used to run codes on basis of boolean conditions.
The conditions can be provided in the following ways :

• if condition
• if-else condition
• if-elseif conditions
• nested if conditions

If Statement :

In if condition a boolean condition is provided after if using "(" and ")".

/*syntax*/   if(booleanCondition){          // program to execute if booleanCondition is true    }

Example : 

Suppose if we have an int a whose value is 10. if we provide the boolean condition as "a==10" then it is a true statement. So if the input is :

int a=10;   if(a==10){         System.out.println("If part executed!") ;             }

The output will be :

If part executed!

If-else statement :

In an if-else statement, if the condition of "if" block turns out to be false then else part is executed.

Suppose if the input is :

int a=10;   if(a>20){         System.out.println("If part executed!") ;             } else {       System.out.println("else part executed!") ;   }

The output will be :

else part executed!

If-elseif statement :

In an if-elseif statement, conditions are provided in the elseif part also. We can combine if-elseif with else also. So when all the conditions will fail else part will execute. Suppose if the input is :

int a=10;   if(a>20){         System.out.println("If part executed!") ;             } elseif (a>15) {       System.out.println("elseif part executed!") ;   } else {        System.out.println("else part executed!") ;    }

The output will be :

else part executed!

Nested If statements :

If one "if condition" is provided inside the outer if statement then it is known as nested if statement.

/*syntax*/   if(condition1){          // program executed if condition1 is true        if(condition2){             // program executed if condition2 is true            }    }

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                    The switch statement can be considered as an alternative for if-elseif stat ...