{"id":77654,"date":"2020-04-09T11:14:39","date_gmt":"2020-04-09T05:44:39","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=77654"},"modified":"2020-04-09T11:14:39","modified_gmt":"2020-04-09T05:44:39","slug":"java-console","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/java-console\/","title":{"rendered":"Java Console Class – Ways to read Java Console Input"},"content":{"rendered":"

There are many situations when we need to take the input from the user according to his\/her requirement. In such cases we can\u2019t take the inputs in our program rather, we have to take input from the console at the execution of the program.<\/p>\n

Java provides different ways to take input and provide output on the console. In this article, we will learn how to take console input from the user using java console<\/strong>.<\/p>\n

We will learn each way to use a console for user input and output in Java with the help of examples.<\/p>\n

So, let\u2019s start exploring different ways to read input from the Java console.<\/p>\n

Java Console<\/h3>\n

There are three ways to take input from console in Java<\/p>\n

    \n
  1. Using Java BufferedReader class<\/li>\n
  2. Through Java Scanner class<\/li>\n
  3. Using Java Console class<\/li>\n<\/ol>\n

    1. Using BufferedReader class<\/h4>\n

    Using BufferedReader class is the classical method of taking input from the console. Java has introduced this technique since Java 1. The BufferedClass reads data line by line through the readLine() method. This class wraps the System.in with an InputStreamReader.<\/p>\n

    To use these classes, we need to use the java.io package. Let’s see an example to understand this method of reading input from the console.<\/p>\n

    Code to read input using the BufferedReader class:<\/strong><\/p>\n

    package com.techvidvan.consoleinput;\n \n\/\/Java program to demonstrate BufferedReader\n\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\npublic class BufferedReaderDemo\n{\n    public static void main(String[] args) throws IOException \n    {\n        InputStreamReader input = new InputStreamReader(System.in); \n        \/\/Taking the input data using the BufferedReader class\n        BufferedReader reader = new BufferedReader(input); \n\n        \/\/ Reading data using readLine\n        System.out.println(\"Please enter the input:\");\n        String name = reader.readLine();\n    \n        \/\/ Printing the read line\n        System.out.println(\"You entered: \");\n        System.out.println(name);        \n    }\n}\n<\/pre>\n
    Output:<\/strong><\/p>\n
    Please enter the input:
    \nTechVidvan’s Java Tutorial
    \nYou entered:
    \nTechVidvan’s Java Tutorial<\/div>\n
    Using BufferedReader class until the user writes \u201cover\u201d<\/h5>\n
    We can also use the BufferedReader class to take the input from the user until the user types any string that matches with our test String. Let\u2019s take an example to understand this.<\/p>\n
    Code to understand this example:<\/strong><\/p>\n
    package com.techvidvan.consoleinput;\n\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\npublic class BufferedReaderDemo\n{\n    public static void main(String[ ] args) throws IOException \n    {\n        InputStreamReader input = new InputStreamReader(System.in); \n        \/\/Taking the input data using the BufferedReader class\n        BufferedReader reader = new BufferedReader(input); \n\n\n        String name = \"\"; \n        System.out.println(\"Enter the names and when you want to stop entering the name, type Over\");\n\n        while(!name.equals(\"Over\"))\n        { \n\n            System.out.println(\"Enter the name: \"); \n            \/\/ Reading data using readLine() method\n            name = reader.readLine(); \n          \n            \/\/ Printing the read line\n            System.out.println(\"The entered name is: \"+name); \n           \n            if(name.contentEquals(\"Over\"))\n                System.out.println(\"You entered Over!!\");\n        } \n        reader.close(); \n        input.close(); \n    }  \n}\n<\/pre>\n
    Output:<\/strong><\/p>\n
    Enter the names and when you want to stop entering the name, type Over
    \nEnter the name:
    \nAvina
    \nThe entered name is: Avina
    \nEnter the name:
    \nNeha
    \nThe entered name is: Neha
    \nEnter the name:
    \nRavi
    \nThe entered name is: Ravi
    \nEnter the name:
    \nOver
    \nThe entered name is: Over
    \nYou entered Over!!<\/div>\n
    Note:<\/strong> The method readLine() is used to take the String input from the user. If you want to read the other types, we can use the methods like<\/em><\/p>\n