Java for Loop (With Examples)

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Please refer article to understand this ++ notation. For example when you are working with single dimensional Array, you can use to iterate from starting to array end but when you are working with Two Dimensional array or Multi Dimensional Array, you have to use this Nested For Loop in Java. Imagine you need to print a sentence 50 times on your screen. If it results in false the control comes out of the java for loop and executes the statement immediately following the loop.

If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use the do-while loop. You should build the string as you go along as well. Then the inner loop is executed in full till the inner loop number reaches 5 less than 6. This is where the actual logic is executed.

nested loops in java

What Is a Nested While Loop. A nested while loop is a while statement inside another while statement. In a nested while loop, one iteration of the outer loop is first executed, after which the inner loop is executed. The execution of the inner loop continues till the condition described in the inner loop is satisfied. Once the condition of the inner loop is satisfied, the program moves to the next iteration of the outer loop. Basic Structure of Nested While Loop Consider the code snippet of a nested while loop: The output from this program will be like this: Notice how the outer loop starts with the first iteration for the starting number 1. Then the inner loop is executed in full till the inner loop number reaches 5 less than 6. The process is then repeated for the next iteration of the outer loop till the condition of the outer loop number less than nested for loop in java is met. Here the outer loop is the code: The inner loop starts just after the while statement of the outer loop: Following the first iteration of the outer nested for loop in java, the inner loop is executed in full. Only after the complete execution of all the iterations of the inner loop is the next iteration of the outer loop executed. A coach is putting together a basketball team. There are 10 players for the try outs, the players are numbered 1 through 10. Each player gets 6 chances at the hoop. Use a nested while loop in Java to print out a chart to record the number of the player and the number of tries each player had. The chart will be used on the field to fill in the scores as the player scores a hoop or not. The output for this program could be something like: and so on. The chart prints out the number of each player, the trial number for each player, and space for writing if the player scored a hoop or not. The outer loop says, as it constrains the number of players to 10, will iterate for players 1 through 10. Since the inner loop says checks for the number of tries, ensuring it is less than 7, the inner loop will be executed for each player for 6 iterations, since each player has 6 tries. Use of Break in Nested While loop Now suppose the coach would like to consider only the nested for loop in java 5 tries for each player. In this case, the inner loop can be programmed to break out of the loop. This is what the code would look like: In this case, the chart will print out the trial number only for the first 5 trials, like you can see in this set of code: Notice how there is an if condition with a break statement within the inner loop so that when the loop reaches 6, the results are not printed out. This way, only the first 5 tries for each player will be recorded. Lesson Summary Let's take a few moments to review what we've learned… A nested while loop in Java is a while loop within a while loop. For each iteration of the outer loop, all of the iterations of the inner loop are executed before moving on to the next iteration of the outer loop. To discontinue the inner loop, a break statement with an if-else condition clause can be included within the inner loop. When the condition within the if-else statement is met, the inner loop will break, and the program will continue with the next iteration of the outer loop. Earning College Credit Did you know… We have over 160 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level. To learn more, visit our.

That is, the first loop uses i as the counter, while j is used for the second, and so on. This is what the code would look like: In this case, the chart will print out the trial number only for the first 5 trials, like you can see in this set of code: Notice how there is an if condition with a break statement within the inner loop so that when the loop reaches 6, the results are not printed out. Try an example where width is 3 and height is 2, and see if it does what you expect. Basic syntax of Java's do statement is as follows. So 50 times, this will print out the product of i and j. For example when you are working with single dimensional Array, you can use to iterate from starting to array end but when you are working with Two Dimensional array or Multi Dimensional Array, you have to use this Nested For Loop in Java. An example of a nested loop is a routine that loops over a table's rows and columns. In this case, the inner loop can be programmed to break out of the loop. The second one has more than one initializations, as well as more than one update variables. Once a row has been printed, it can't go back up.