Control Structures | OOPS Using JAVA |SNS Institutions

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Control structures in Java determine the flow of execution of a program. By default, Java programs execute statements sequentially from top to bottom. However, in practical programming, it is often necessary to make decisions, repeat actions, or choose between multiple alternatives. Control structures make this possible by allowing programmers to control how and when statements are executed. Java control structures are mainly classified into three categories: selection (decision-making) statements, iteration (looping) statements, and branching statements. Selection statements are used when a program needs to make decisions based on certain conditions. The most commonly used selection statements in Java are if, if-else, else-if ladder, and switch. The if statement executes a block of code only when a specified condition is true. The if-else statement provides an alternative block of code when the condition is false. The else-if ladder allows multiple conditions to be checked in sequence, making it useful when several choices are available. The switch statement is used when a variable needs to be compared against multiple constant values, improving readability when compared to multiple if-else statements. Iteration statements, also known as loops, are used to execute a block of code repeatedly as long as a specified condition is true. Java provides three main looping structures: for loop, while loop, and do-while loop. The for loop is generally used when the number of iterations is known in advance. The while loop is suitable when the number of iterations depends on a condition evaluated before execution. The do-while loop executes the code at least once because the condition is checked after execution. Branching statements are used to alter the normal flow of control within loops or blocks of code. Java provides break, continue, and return statements. The break statement terminates the loop or switch statement immediately. The continue statement skips the current iteration and moves to the next iteration of the loop. The return statement exits from a method and optionally returns a value. In conclusion, control structures are essential for building logical and dynamic Java programs. They enable decision-making, repetition, and flexible program execution, helping developers create efficient and well-organized applications.

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