If Else Statement in Java:
In If Else statement a series of Boolean values become Check when condition become true that block of code Execute.
If Condition - In Java program when if condition become true then if block code become Execute.
Else Condition- When if condition Become false then else block code Execute
Else If Condition- Else if statement is used to Check New condition in Else Block.
Control Statement Flow:
If Else Statement Example:
public class My_First_Test {
public static void main(String args[]) {
int x = 30;
if( x == 10 ) {
System.out.print("Value of X is 10");
}else if( x == 20 ) {
System.out.print("Value of X is 20");
}else if( x == 30 ) {
System.out.print("Value of X is 30");
}else {
System.out.print("This is else statement");
}
}
}
Output:
Compiling the source code....
$javac My_First_Test.java 2>&1
$javac My_First_Test.java 2>&1
Executing the program....
$java -Xmx128M -Xms16M My_First_Test
Value of X is 30
Switch Statement in Java:
In switch, statement a variable is checked from list of Condition or values. Each value is called a case, and the variable being switched on is checked for each case.
Switch Statement Flow:
Important Note About switch statement −
- Variable use in a switch statement only be integers, convertable integers (byte, short, char), strings and enums.
- You can use any number of case statements within a switch.
- When the variable being switched on is equal to a case, the statements following that case will execute until a break statement is reached.
- When a break statement is reached, the switch terminates, and the flow of control jumps to the next line following the switch statement.
- Not every case needs to contain a break. If no break appears, the flow of control will fall through to subsequent cases until a break is reached.
- A switch statement can have an optional default case, which must appear at the end of the switch. The default case can be used for performing a task when none of the cases is true. No break is needed in the default case.
Switch Statement Example:
public class Test {
public static void main(String args[]) {
// char grade = args[0].charAt(0);
char grade = 'C';
switch(grade) {
case 'A' :
System.out.println("Excellent!");
break;
case 'B' :
case 'C' :
System.out.println("Well done");
break;
case 'D' :
System.out.println("You passed");
case 'F' :
System.out.println("Better try again");
break;
default :
System.out.println("Invalid grade");
}
System.out.println("Your grade is " + grade);
}
}
Output
Well done
Your grade is C
Let’s us understand Difference between If Else and Switch Statements
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if-else Statements
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Switch Statements
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if-else can be used for a range of values
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switch-case is valid only for cases where we have a specific set of outputs
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if-else can handle integers, not fractional values.
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switch-case only accepts integers, not fractional values.
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if-else is difficulty to when large number of conditions.
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switch case is Easily readability and understand for a large number of conditions.
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Where to use If-else: When simple and Few Comparisons
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Where to use Switch: when Complex and large Comparisons.
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