Talk about using Java input wait (Scanner) in VS Code


It all started when I decided to solve this with VS Code.

-A: First Attokoda (Welcome to AtCoder) --practice contest | AtCoder

Problem statement Takahashi wants to process the data. Given the integers a, b, c and the string s. Display the integer a + b + c and the string s side by side.

Run Java with VS Code (debug)

In order to execute (debug) Java with VS Code, an extension called Debugger for Java is required.

Well, the story around that is troublesome, so I'll omit it. If you google it, it will come out, so no matter what.

Normally, it starts debugging with F5, but at that time you need a configuration file called launch.json. By default, it should look like this.

    "version": "0.2.0",
    "configurations": [
            "type": "java",
            "name": "Debug (Launch)",
            "request": "launch",
            "cwd": "${workspaceFolder}",
            "console": "internalConsole",
            "stopOnEntry": false,
            "mainClass": "",
            "args": ""

However, if you execute it in this state, it will be output to the "debug console" at the bottom of VS Code. スクリーンショット (9).png

With this, you can check the output, but you cannot accept the input with Scanner like the answer example of AtCoder mentioned above.

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(;
		//Integer input
		int a = sc.nextInt();
		//Space-separated integer input
		int b = sc.nextInt();
		int c = sc.nextInt();
		//Character string input
		String s =;
		System.out.println((a+b+c) + " " + s);

Rewrite launch.json

In conclusion, all you need to do is rewrite the " console ":" internal Console " in launch.json. If you rewrite this to " console ":" integratedTerminal " and then execute it, the output destination will change from "debug console" to "terminal" and you will be waiting for input as shown below. スクリーンショット ().png If you enter any input in the terminal in this state, it will be read into Scanner. スクリーンショット ()2.png


However, I thought that this problem, the input is given as an argument of the main function, but it is different. Japanese rubbers cashine

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