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{"@context":"http:\/\/schema.org","@type":"Article","dateCreated":"2014-08-20T11:00:11+03:00","datePublished":"2014-08-20T11:00:11+03:00","dateModified":"2014-08-19T12:34:11+03:00","headline":"Java do while example","name":"Java do while example","keywords":"do,loop,while","url":"https:\/\/examples.javacodegeeks.com\/java-development\/java-basics\/while-loop\/java-do-while-example\/","description":"There are four ways of looping with Java: for loops, for-each loops (since Java 1.5), while loops and the do-while loops. In this example, I will show how to use the do-while loops to repeat blocks of","copyrightYear":"2014","articleSection":"while loop","articleBody":"There are four ways of looping with Java: for loops, for-each loops (since Java 1.5), while loops and the do-while loops.\r\n\r\nIn this example, I will show how to use the do-while loops to repeat blocks of statements in Java.\r\n \r\n \r\n \r\n \r\n \r\n \r\ndo-while structure\r\nA do-while has the following base structure:\r\ndo {\r\n\/\/ the code block to repeat\r\n} while(boolean_expr);\r\n\r\nAs you can see, the boolean expression boolean_expr is evaluated in the end of the do-while block. This means that, whether boolean_expr is true or false, the do-while block will execute at least one time.\r\n\r\nLet's see an example:\r\n\r\nSimpleDoWhileExample\r\nCreate a class called SimpleDoWhileExample with the following code:\r\npackage com.javacodegeeks.example;\r\n\r\npublic class SimpleDoWhileExample {\r\n\t\r\n\tpublic static void main(String[] args) {\r\n\t\tboolean f = false;\r\n\t\tint count = 1;\r\n\t\t\r\n\t\tdo {\r\n\t\t\tSystem.out.printf(\"This gets printed %d times\\n\",count);\r\n\t\t\tcount++;\r\n\t\t} while (f);\r\n\t}\r\n\r\n}\r\n\r\n\r\nSince the f value is checked at the bottom of the do-while block, this will print this:\r\nThis gets printed 1 times\r\n\r\n\r\nNormally, you would want to use the do-while loop when you want to ask something and the answer of the question determines whether the loop will go on executing or not. For more, check the following example.\r\n\r\nDoAddWhileNotZero\r\nIn this example, we will show how to find the sum of some numbers, until the user enters 0 (which means that we should stop the loop). Create a class called DoAddWhileNotZero with this source code:\r\npackage com.javacodegeeks.example;\r\n\r\npublic class DoAddWhileNotZero {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tjava.util.Scanner stdIn = new java.util.Scanner(System.in);\r\n\t\tint sum = 0;\r\n\t\tint num;\t\r\n\t\t\r\n\t\tdo {\r\n\t\t\tSystem.out.print(\"Enter a number (0 to stop): \");\r\n\t\t\tnum = stdIn.nextInt();\r\n\t\t\tsum += num;\r\n\t\t} while(num != 0);\r\n\t\t\r\n\t\tSystem.out.println(\"The sum of all numbers is \"+sum);\r\n\r\n\t}\r\n\r\n}\r\n\r\n\r\nSo, we get the number from the user by using a java.util.Scanner instance, and after adding this number to the variable sum (adding 0 won't make a difference), we check if the number entered is 0. If not, the loop is executed once again.\r\n\r\nOne sample output of this example is:\r\nEnter a number (0 to stop): 7\r\nEnter a number (0 to stop): 2\r\nEnter a number (0 to stop): 0\r\nThe sum of all numbers is 9\r\n\r\n\r\nDownload Code\r\nDownload\r\nYou can download the full source code of this example here : DoWhileExample","publisher":{"@id":"#Publisher","@type":"Organization","name":"Examples Java Code Geeks","logo":{"@type":"ImageObject","url":"\/wp-content\/uploads\/2013\/05\/JavaCodeGeeks-logo.png"},"sameAs":["https:\/\/feeds.feedburner.com\/examplesjavacodegeeks","https:\/\/www.facebook.com\/javacodegeeks","https:\/\/twitter.com\/javacodegeeks","https:\/\/www.linkedin.com\/groups\/3810709\/","https:\/\/www.youtube.com\/channel\/UCxoUc7Rar2q90Gu0nT2ffuQ","https:\/\/github.com\/javacodegeeks\/"]},"sourceOrganization":{"@id":"#Publisher"},"copyrightHolder":{"@id":"#Publisher"},"mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/examples.javacodegeeks.com\/java-development\/java-basics\/while-loop\/java-do-while-example\/","breadcrumb":{"@id":"#Breadcrumb"}},"author":{"@type":"Person","name":"Aldo Ziflaj","url":"https:\/\/examples.javacodegeeks.com\/author\/aldo-ziflaj\/"},"image":{"@type":"ImageObject","url":"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg","width":1200,"height":150}}