Control flow statements in java pdf




















You may have as many case statements as you wish within a switch statement. This keyword ensures that execution of the switch statement stops immediately, rather than continuing to the next case. Were the break statement were not included "fall- through" would occur and the next case would be evaluated and possibly executed if it meets the conditions.

This repetitive operation is done through a looping statement. A loop is repetition of one or more instructions, which continues till certain condition is met. True Statement 1 Statement 2. The initialization expression is executed only once in the beginning of the loop. Test expression gets checked every time before entering in the body of the loop.

The update expression is executed every time after executing the loop-body. Empty Loop: If a loop does not contain any statement in its loop-body, it is said to be an empty loop. It cannot be accessed outside the statement body. It first tests a specified conditional expression and as long as the conditional expression is evaluated to non zero true , action taken i. This is, in effect, a goto just past the body of the loop, to the loop's end.

That is, it causes program control to transfer back to the caller of the method. Here, return causes execution to return to the Java run-time system, since it is the run-time system that calls main. Switch statement :-Calender 3.

For loop:-youtube playlist 4. Infinite for loop:-Normal playlist,breakfail,Switch of a fan becomes non functional 5. While Loop:-Alarm 6. Do While Loop : print Menu atleast once 7. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel.

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Flag for inappropriate content. Download now. Original Title: Java Control Statements ppt free download. Related titles. Consider the following example in which we have used the if statement in the java code.

The if-else statement is an extension to the if-statement, which uses another block of code, i. The else block is executed if the condition of the if-block is evaluated as false. The if-else-if statement contains the if-statement followed by multiple else-if statements. In other words, we can say that it is the chain of if-else statements that create a decision tree where the program may enter in the block of code where the condition is true.

We can also define an else statement at the end of the chain. In nested if-statements, the if statement can contain a if or if-else statement inside another if or else-if statement. In Java, Switch statements are similar to if-else-if statements. The switch statement contains multiple blocks of code called cases and a single case is executed based on the variable which is being switched.

The switch statement is easier to use instead of if-else-if statements. It also enhances the readability of the program. While using switch statements, we must notice that the case expression will be of the same type as the variable. However, it will also be a constant value. The switch permits only int, string, and Enum type variables to be used. In programming, sometimes we need to execute the block of code repeatedly while some condition evaluates to true.

However, loop statements are used to execute the set of instructions in a repeated order. The execution of the set of instructions depends upon a particular condition. In Java, we have three types of loops that execute similarly. However, there are differences in their syntax and condition checking time. We use the for loop only when we exactly know the number of times, we want to execute the block of code.

Java provides an enhanced for loop to traverse the data structures like array or collection. In the for-each loop, we don't need to update the loop variable. The syntax to use the for-each loop in java is given below. The while loop is also used to iterate over the number of statements multiple times.

However, if we don't know the number of iterations in advance, it is recommended to use a while loop. It is also known as the entry-controlled loop since the condition is checked at the start of the loop. If the condition is true, then the loop body will be executed; otherwise, the statements after the loop will be executed.

The do-while loop checks the condition at the end of the loop after executing the loop statements. When the number of iteration is not known and we have to execute the loop at least once, we can use do-while loop. It is also known as the exit-controlled loop since the condition is not checked in advance.

The syntax of the do-while loop is given below. Jump statements are used to transfer the control of the program to the specific statements. In other words, jump statements transfer the execution control to the other part of the program. There are two types of jump statements in Java, i.

As the name suggests, the break statement is used to break the current flow of the program and transfer the control to the next statement outside a loop or switch statement. However, it breaks only the inner loop in the case of the nested loop. The break statement cannot be used independently in the Java program, i. Unlike break statement, the continue statement doesn't break the loop, whereas, it skips the specific part of the loop and jumps to the next iteration of the loop immediately.

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