Java Conditional Statements - The Coding Shala

January 26, 2019

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Java's Conditional Statements

Java Supports two conditional or selection statements: if and switch. These statements are used to control the flow to the program based on the condition that we have put.

Java Conditional Statements - The Coding Shala

Java If else Statement

The basic statement of Java's If the statement is as follows:

if(condition){
//code
}
else{
//code
}

or

if(condition1 operators condition 2){ //code
 }

OR

if(codition1){ 
//code
}
else if(condition2){ //code 
}
else{ //code 
}

The condition is an expression returns a boolean value. The else part is optional.

Note: we can also use nested if statements. (if inside if statement)

The following Java program explains the if statement:

class IfExample{
    public static void main(String[] args){
        int a = 10;
        int b = 20;
        
        if(a<b){
            System.out.println("a is less than b");
        }else{
            System.out.println("a is greater than b");
        }
        
        boolean aa = true;
        if(aa){
            System.out.println("Value of aa is true");
        }
        
        if(aa){ //nested if statement
            if(a<6){
                System.out.println("Value of a is less than 6 and a is: " + a);
            } else if(a<11){
                System.out.println("Value of a is less than 11 and a is:  " + a);
            }
        }
    }
}



<<<Output of this program is >>>>>>>>

a is less than b
Value of aa is true
Value of a is less than 11 and a is:  10

Java switch Statement

The basic syntax of Java's switch statement is as follows:

switch(expression) {
  case value1:
          //code
           break;
  case value2:
               //code
               break;
  .
  .
  .
  case valueN:
          //code
          break;
   default:
      //code
}

Here, expression and value specified in the case statement must be type compatible and can be a byte, short, int, or char. The default statement is executed when none of the case value matched with the value of the expression. The default statement is optional. The break statement is used to terminate a statement sequence that means used to jump out of the switch.

Note: we can also use nested switch statements.

The following Java Program explains the switch statement:

class SwitchExample{
    public static void main(String [] args){
        int num = 4;
        switch(num) {
            case 0:
                System.out.println("Value of num is 0");
                break;
            case 1:
                System.out.println("Value of num is 1");
                break;
            case 4:
                System.out.println("Value of num is 4");
                break;
            default:
                System.out.println("Default statement");
        }
    }
}



<<<<Output of this program is >>>>
Value of num is 4

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