In this tutorial, you will learn simple ways to display output to users and take input from users in Java.<\/p>\n\n\n\n
In Java, you can simply use<\/p>\n\n\n\n
System.out.println(); or\n\nSystem.out.print(); or\n\nSystem.out.printf();\n<\/code><\/pre>\n\n\n\nto send output to standard output (screen).<\/p>\n\n\n\n
Here,<\/p>\n\n\n\n
System<\/code> is a class<\/li>out<\/code> is a public<\/code> static<\/code> field: it accepts output data.<\/li><\/ul>\n\n\n\nDon’t worry if you don’t understand it. We will discuss class<\/code>, public<\/code>, and static<\/code> in later chapters.<\/p>\n\n\n\nLet’s take an example to output a line.<\/p>\n\n\n\n
class AssignmentOperator {\n public static void main(String[] args) {\n \t\n System.out.println(\"Java programming is interesting.\"); \n }\n}\n<\/code><\/pre>\n\n\n\nOutput<\/strong>:<\/p>\n\n\n\nJava programming is interesting.<\/samp><\/code><\/pre>\n\n\n\nHere, we have used the println()<\/code> method to display the string.<\/p>\n\n\n\n
\n\n\n\nDifference between println(), print() and printf()<\/h3>\n\n\n\nprint()<\/code>\u00a0– It prints string inside the quotes.<\/li>println()<\/code>\u00a0– It prints string inside the quotes similar like\u00a0print()<\/code>\u00a0method. Then the cursor moves to the beginning of the next line.<\/li>printf()<\/code>\u00a0– It provides string formatting (similar to\u00a0printf in C\/C++ programming).<\/li><\/ul>\n\n\n\n
\n\n\n\nExample: print() and println()<\/h3>\n\n\n\nclass Output {\n public static void main(String[] args) {\n \t\n System.out.println(\"1. println \");\n System.out.println(\"2. println \");\n \t\n System.out.print(\"1. print \");\n System.out.print(\"2. print\");\n }\n}\n<\/code><\/pre>\n\n\n\nOutput<\/strong>:<\/p>\n\n\n\n1. println \n2. println <\/samp>\n\n1. print <\/samp>\n2. print\n<\/samp><\/code><\/pre>\n\n\n\nIn the above example, we have shown the working of the\u00a0print()<\/code>\u00a0and\u00a0println()<\/code>\u00a0methods. To learn about the\u00a0printf()<\/code>\u00a0method,<\/p>\n\n\n\n
\n\n\n\nExample: Printing Variables and Literals<\/h3>\n\n\n\nclass Variables {\n public static void main(String[] args) {\n \t\n Double number = -10.6;\n \t\n System.out.println(5);\n System.out.println(number);\n }\n}\n<\/code><\/pre>\n\n\n\nWhen you run the program, the output will be:<\/p>\n\n\n\n
5\n-10.6<\/samp><\/code><\/pre>\n\n\n\nHere, you can see that we have not used the quotation marks. It is because to display integers, variables and so on, we don’t use quotation marks.<\/p>\n\n\n\n
\n\n\n\nExample: Print Concatenated Strings<\/h3>\n\n\n\nclass PrintVariables {\n public static void main(String[] args) {\n \t\n Double number = -10.6;\n \t\n System.out.println(\"I am \" + \"awesome.\");\n System.out.println(\"Number = \" + number);\n }\n}\n<\/code><\/pre>\n\n\n\nOutput<\/strong>:<\/p>\n\n\n\nI am awesome.\nNumber = -10.6\n<\/samp><\/code><\/pre>\n\n\n\nIn the above example, notice the line,<\/p>\n\n\n\n
System.out.println(\"I am \" + \"awesome.\");\n<\/code><\/pre>\n\n\n\nHere, we have used the +<\/code> operator to concatenate (join) the two strings: “I am “<\/var> and “awesome.”<\/var>.<\/p>\n\n\n\nAnd also, the line,<\/p>\n\n\n\n
System.out.println(\"Number = \" + number);\n<\/code><\/pre>\n\n\n\nHere, first the value of variable number<\/var> is evaluated. Then, the value is concatenated to the string: “Number = “<\/var>.<\/p>\n\n\n\n
\n\n\n\nJava Input<\/h2>\n\n\n\n
Java provides different ways to get input from the user. However, in this tutorial, you will learn to get input from user using the object of Scanner<\/code> class.<\/p>\n\n\n\nIn order to use the object of Scanner<\/code>, we need to import java.util.Scanner<\/code> package.<\/p>\n\n\n\n\nimport java.util.Scanner;\n<\/code><\/pre>\n\n\n\n<\/p>\n\n\n\n
Then, we need to create an object of the Scanner<\/code> class. We can use the object to take input from the user.<\/p>\n\n\n\n\n\/\/ create an object of Scanner\nScanner input = new Scanner(System.in);\n\n\/\/ take input from the user\nint number = input.nextInt();\n<\/code><\/pre>\n\n\n\n
\n\n\n\nExample: Get Integer Input From the User<\/h3>\n\n\n\nimport java.util.Scanner;\n\nclass Input {\n public static void main(String[] args) {\n \t\n Scanner input = new Scanner(System.in);\n \t\n System.out.print(\"Enter an integer: \");\n int number = input.nextInt();\n System.out.println(\"You entered \" + number);\n\n \/\/ closing the scanner object\n input.close();\n }\n}\n<\/code><\/pre>\n\n\n\nOutput<\/strong>:<\/p>\n\n\n\nEnter an integer: 23\nYou entered 23\n<\/samp><\/code><\/pre>\n\n\n\nIn the above example, we have created an object named input<\/var> of the Scanner<\/code> class. We then call the nextInt()<\/code> method of the Scanner<\/code> class to get an integer input from the user.<\/p>\n\n\n\nSimilarly, we can use nextLong()<\/code>, nextFloat()<\/code>, nextDouble()<\/code>, and next()<\/code> methods to get long<\/code>, float<\/code>, double<\/code>, and string<\/code> input respectively from the user.<\/p>\n\n\n\nNote<\/strong>: We have used the close()<\/code> method to close the object. It is recommended to close the scanner object once the input is taken.<\/p>\n\n\n\n
\n\n\n\nExample: Get float, double and String Input<\/h3>\n\n\n\nimport java.util.Scanner;\n\nclass Input {\n public static void main(String[] args) {\n \t\n Scanner input = new Scanner(System.in);\n \t\n \/\/ Getting float input\n System.out.print(\"Enter float: \");\n float myFloat = input.nextFloat();\n System.out.println(\"Float entered = \" + myFloat);\n \t\n \/\/ Getting double input\n System.out.print(\"Enter double: \");\n double myDouble = input.nextDouble();\n System.out.println(\"Double entered = \" + myDouble);\n \t\n \/\/ Getting String input\n System.out.print(\"Enter text: \");\n String myString = input.next();\n System.out.println(\"Text entered = \" + myString);\n }\n}\n<\/code><\/pre>\n\n\n\nOutput<\/strong>:<\/p>\n\n\n\nEnter float: 2.343\nFloat entered = 2.343\nEnter double: -23.4\nDouble entered = -23.4\nEnter text: Hey!\nText entered = Hey!\n<\/samp><\/code><\/pre>\n\n\n\nAs mentioned, there are other several ways to get input from the user.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this tutorial, you will learn simple ways to display output to users and take input from users in Java. Java Output In Java, you can simply use to send output to standard output (screen). Here, System is a class out is a public static field: it accepts output data. Don’t worry if you don’t understand it. We will discuss class, public, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[288],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1154"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=1154"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1154\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}