In Java, control structures determine the flow of execution of a program. They enable decision-making, looping, and branching, allowing programs to handle different situations dynamically.

1. CONDITIONAL
STATEMENTS
IN JAVA
BY,
MRS.V.SANGEETHA.,

2. IF STATEMENT
if (condition) {
// block of code
}
Example:-

3. IF-ELSE STATEMENT
if (condition) {
// true block
} else {
// false block
}

4. IF-ELSE IF LADDER
if (condition1) {
// block1
} else if (condition2) {
// block2
} else {
// default block
}

5. SWITCH STATEMENT
switch (expression) {
case value1:
// block
break;
default:
// default block
}

6. CHECK EVEN OR ODD USING IF-
ELSE
import java.util.Scanner;
public class EvenOddScanner {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter an integer: ");
int number = sc.nextInt();
if (number % 2 == 0)
System.out.println(number + " is Even");
else
System.out.println(number + " is Odd");
}
}

7. PROGRAM WITH BUFFEREDREADER
– GRADING WITH IF-ELSE IF
import java.io.*;
public class GradeChecker {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter your marks: ");
int marks = Integer.parseInt(br.readLine());
if (marks >= 90)
System.out.println("Grade A");
else if (marks >= 75)
System.out.println("Grade B");
else if (marks >= 60)
System.out.println("Grade C");
else
System.out.println("Fail");
}
}

8. LOOPING STATEMENTS IN JAVA

9. FOR LOOP
for (int i = 1; i <= 5; i++) {
System.out.println(i);
}

10. WHILE LOOP
int i = 1;
while (i <= 5) {
System.out.println(i);
i++;
}

11. DO-WHILE LOOP
int i = 1;
do {
System.out.println(i);
i++;
} while (i <= 5);

12. PRINT MULTIPLICATION TABLE
USING FOR LOOP
import java.util.Scanner;
public class MultiplicationTable {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter number: ");
int num = sc.nextInt();
for (int i = 1; i <= 10; i++) {
System.out.println(num + " x " + i + " = " + (num * i));
}
}
}

13. SUM OF NUMBERS USING WHILE
LOOP
import java.io.*;
public class SumUsingWhile {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new
InputStreamReader(System.in));
System.out.print("Enter the limit: ");
int n = Integer.parseInt(br.readLine());
int sum = 0, i = 1;
while (i <= n) {
sum += i;
i++;
}
System.out.println("Sum = " + sum);
}
}