Delegate Quick Scanner

QScanner.java

//import java.io.*; import java.util.*;

/**
 * Delegate quick Scanner. Example usage: <pre>QScanner scanner = new QScanner(System.in);</pre>
 */
@SuppressWarnings({"unused", "Duplicates"}) //noinspection Duplicates
public class QScanner {
    java.io.BufferedReader br; java.util.StringTokenizer st;

    public QScanner() { br = new java.io.BufferedReader(new java.io.InputStreamReader(System.in)); }

    public QScanner(java.io.InputStream is) {
        br = new java.io.BufferedReader(new java.io.InputStreamReader(new java.io.DataInputStream(is)));
    }

    public String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new java.util.StringTokenizer(br.readLine());
            } catch (java.io.IOException e) { e.printStackTrace(); }
        }
        return st.nextToken();
    }

    public int nextInt() { return Integer.valueOf(next()); }

    public long nextLong() { return Long.valueOf(next()); }

    public double nextDouble() { return Double.valueOf(next()); }

    public void close() {
        if (br != null) { try { br.close(); } catch (java.io.IOException e) { e.printStackTrace(); } }
    }
}

The quick scanner can be customized a bit to adapt to your need. Examples:

https://github.com/ducquoc/euler-fun/blob/master/euler/src/main/java/vn/ducquoc/euler/HR034.java#L50
https://raw.githubusercontent.com/dqonline/pic/main/u/TECH/VNOJ_LIS_sample.png
...