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Using various circumstances, the switch statement in Java executes a single expression. It is similar to an if-then-else expression. The short, byte, long, enum, int types, string, and a few container types like Short, Byte, Long, and Int are all compatible with the switch statement. The strings are now supported in switch statements since Java 7. In this article, we will talk about the uses of switches in Java and the working of the switch statement.
A conditional statement in Java that tests many values and produces one result is known as a switch statement. Cases are the various values that are checked. It resembles a statement with multiple branches. Since Java 7 was released, the user can also use strings in a lot of situations. The syntax to use a Java switch case is described as follows:
switch(exp)
{
case value:
//FirstStatement
break;
case value x :
//SecondStatement
break;
default:
//ThirdStatement
}
When the user declares a Java switch case, there are a few guidelines to follow. The following considerations should be made when developing a Java switch case.
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One of several code blocks can be chosen for execution in Java using the switch case.
Break keyword: The control exits the switch block as soon as Java hits a break keyword. When this keyword is encountered, code execution halts, and case testing within the block is completed as soon as a match is discovered. Because it disregards the remainder of the execution of the code whenever there is a break, considerable time of execution is saved.
Default Keyword: It is used for describing the code that is run when no test case matches the expression.
This is how Java's switch case function works
Java's switch case allows many conditions to be checked simultaneously, similar to an if-else ladder. An input that may be a fixed or a direct expression that may be examined is given to Switch. Each test case's value is compared against the expression's value until a match is made. The corresponding code is executed if the default keyword when specified, does not find a match. Otherwise, the code designated for the test case that matches it is run.
When using the Java switch case, keep the following in mind:
Switch (1+2+3+4) and Switch (1*2+3%4) are valid expressions.
Switch(ef+gh), and Switch(e+f+g) are invalid expressions.
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Let us see a Java example to understand the switch case in a better manner:
public class Main {
public static void main(String[] args) {
int mon = 6;
switch (mon)
{
case 1:
System.out.println("Jan");
break;
case 2:
System.out.println("Feb");
break;
case 3:
System.out.println("Mar");
break;
case 4:
System.out.println("Apr");
break;
case 5:
System.out.println("May");
break;
case 6:
System.out.println("Jun");
break;
default: System.out.println("The next half");
} }
}
The output of the above Java code will be:
Jun
A switch can be used as a component of the statement chain of an external switch. A switch statement establishes one's own block, ensuring that there is no possibility of any conflicts between both the case variables inside the inner switch and in the outer switch.
Let us see a Java program below to understand nested switch cases in a better manner:
public class HKR {
public static void main(String[] args)
{
String Branch = "Computer Science";
int yr = 2;
switch (yr) {
case 1:
System.out.println(
"The selective courses are: English and Algebra");
break;
case 2:
switch (Branch) {
case "Computer Science":
case "ECE":
System.out.println(
"The selective courses are: Artificial Intelligence and Machine Learning");
break;
case "CCE":
System.out.println(
"The selective courses are: Machine Engineering");
break;
default:
System.out.println(
"The selective course is: Optimization");
}
}
}
}
The output of the above Java code will be:
The selective courses are: Artificial Intelligence and Machine Learning
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Conclusion
In this article, we have talked about switch cases in Java. A conditional statement in Java that tests many values and produces one result is known as a switch statement. Cases are the various values that are checked. We have also discussed the rules related to switch cases along with their working. We have also demonstrated several examples related to Java’s switch case statements.
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A single code block can be chosen for execution in Java using the switch case. It is basically done by the break keyword or default keyword.
The syntax of the switch statement is given below:
switch(exp)
{
case value:
//FirstStatement
break;
case value x :
//SecondStatement
break;
default:
//ThirdStatement
}
Until a break statement is reached, the switch statement examines an expression, compares its value to a succession of case phrases, and then executes statements following each case clause that matches the expression's value.
Java's switch case allows many conditions to be checked simultaneously, similar to an if-else ladder. An input that may be a fixed or a direct expression that may be examined is given to Switch
To stop processing a specific labeled statement included within the switch statement, use the break statement.
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