Java Case Keyword
Case keyword:
- In this article we are going to learn the concept of a java case keyword.
- Generally, java case keyword is used with the switch statements.
- Case keyword is implemented in conditional labeling by the support of the switch statements.
- The block of code which contains a label of several cases on which it is runned or executed only when the given value to the switch matches with the provided cases?
- To execute the label of the case which is branched with the switch statement the code of the program should pass the arguments in the switch case.
- There is no limitation for the case block, as it doesn’t have any internal ending point.
- The switch statement can provide with a multiple case labels.
- Each label can hold the various values like integers or strings or statements.
- The block of code can also contain the break statements which helps in terminating the flow of execution from that block of switch statements.
NOTE: The values of Boolean type, float type, double type cannot be hold by the case label.
Syntax of Case Keyword
switch(block) {
case number1:
//block of code or statements.
break; //optional
case value2:
//block of code that should be executed.
break; //optional
default:
The default code is executed if any of the cases are not matched or executed.
} Examples of Java Case keyword
Example 1: Printing the string values using the case label.
public class CaseEx1 {
public static void main (String [] s) {
String No._of_weeks_in_month="Four”.
switch (No._of_weeks_in_month)
{
case "Four": System.out.println("Four");
}
}
} Output:
Four
Example 2: Using multiple case labels in the java program.
public class CaseEx2 {
public static void main (String [] args) {
String Scales="SA";
switch (Scales)
{
case "SA":
System.out.println("SA").
break.
case "RE":
System.out.println("RE").
break.
case "GA":
System.out.println("GA").
break.
case "MA":
System.out.println("MA").
break;
case "PA":
System.out.println("PA");
break;
case "DA":
System.out.println("DA");
break.
case "NE":
System.out.println("NE");
break.
default:
System.out.println("nothing printed");
}
}
} Output:
SA
Example 3: Printing the value of int using the case label
public class CaseEx3 {
public static void main (String [] args) {
int age=50;
switch(age)
{
case 5:
System.out.println("The age is 5");
break;
case 35:
System.out.println("The age is 35");
break;
case 50:
System.out.println("The age is 50");
break;
default:
System.out.println("No age found");
}
}
} Output:
The age is 50.
Example 4: Case label holding switch statement
public class CaseEx4 {
public static void main (String [] args) {
String clg_name="bvrit”.
int dept_id=189.
switch(clg_name)
{
case "bvrit":
System.out.println("bvrit");
switch(dept_id)
{
case 185:
System.out.println("information technologydepartement ");
break;
case 186:
System.out.println("Computer science Department");
break;
case 187:
System.out.println("Civil Department");
break;
case 188:
System.out.println("mechanical Department");
break;
case 189:
System.out.println("electronics Department");
break;
case 190:
System.out.println("Electrical Department");
break;
}
break;
case "JNTU":
System.out.println("JNTU");
switch(dept_id)
{
case 101:
System.out.println("Mech Department");
break;
case 102:
System.out.println("Computer science Department");
break;
case 103:
System.out.println("Civil Department");
break;
}
break;
case "Lpu":
System.out.println("Lpu");
switch(dept_id)
{
case 115:
System.out.println("Mec Department");
break;
case 118:
System.out.println("Computer science Department");
break;
case 201:
System.out.println("Civil Department");
break;
}
break;
default :
System.out.println("Try once again");
}
}
} Output:
Lpu
Computer science DepartmentExample 5: Calculate the weekday name using case label:
int day = 3;
switch (day of the week) {
case 1:
System.out.println("Mon");
break;
case 2:
System.out.println("Tue");
break;
case 3:
System.out.println("Wed");
break;
case 4:
System.out.println("Thur");
break;
case 5:
System.out.println("Fri");
break;
case 6:
System.out.println("Sat");
break;
case 7:
System.out.println("Sun");
break;
}
Output:
"Wed" (day 3)
EXAMPLE6: Nested case keyword Example:
to Demonstrate
// Switch Case Statement using the nested
// Class
public class nested {
public static void main (String [] args)
{
// input value
String Group = "IT";
int semester = 1;
// Switch case
switch (semester) {
// Case
case 1:
System.out.println(
"Electivecourses: Advance calculus, integration");
// Break statement to hault execution here
// itself if case is matched
break.
// Case
case 2:
// Switch inside a switch
// Nested Switch
switch (Group) {
// Nested case
case "IT":
case "ECE":
System.out.println(
"Electivecourses:Electronics, Mtlab");
break.
// Case
case "EEE":
System.out.println(
"Electivecourses: Antenna Engineering");
break.
// default case
// It will execute if above cases does not
// execute
default:
// Print statement
System.out.println(
"Elective courses:answering or optimization");
}
}
}
}Output
Elective courses: Electronics, Mtlab.