Controlling The Flow Of A Java Program

 

Conditional Statements:

1. if-else Statement:

• Syntax:
• if (condition) { // Code to execute if condition is true } else { // Code to execute if condition is false }
• 
  
Example:
int num = 10; if (num > 0) { System.out.println("Positive number"); } else { System.out.println("Non-positive number"); }



2. switch Statement:

• Syntax:
• switch (expression) { case value1: // Code to execute if expression equals value1 break; case value2: // Code to execute if expression equals value2 break; default: // Code to execute if expression doesn't match any case }
• 
  
Example:
char grade = 'B'; switch (grade) { case 'A': System.out.println("Excellent"); break; case 'B': System.out.println("Good"); break; case 'C': System.out.println("Average"); break; default: System.out.println("Not a valid grade"); }

Looping Constructs:

1. for Loop:

• Syntax:
• for (initialization; condition; update) { // Code to execute repeatedly }
• 
  
Example:
for (int i = 0; i < 5; i++) { System.out.println("Iteration " + (i + 1)); }



2. while Loop:

• Syntax:
• while (condition) { // Code to execute repeatedly }
• 
  
Example:
int i = 0; while (i < 5) { System.out.println("Iteration " + (i + 1)); i++; }

do-while Loop:

• Syntax:
• do { // Code to execute repeatedly } while (condition);
• 
  
Example:
int i = 0; do { System.out.println("Iteration " + (i + 1)); i++; } while (i < 5);

These constructs allow you to control the flow of your Java program based on conditions and perform repetitive tasks using looping mechanisms.