stuart-marks

$ cat Printf.java
public class Printf {
    public static void main(String[] args) {
        System.out.println("Locale.getDefault()=" + java.util.Locale.getDefault());
	    System.out.printf("%.3f%n", 123.45);
    }
}
$ javac Printf.java

$ java -version

stuart-marks

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.Stream;

// Suppose we have an API where:
//  - a Clazz has a List of Methods,

stuart-marks

package masterclass;

import java.util.*;
import java.util.stream.*;
import java.util.Map.Entry;

import static java.util.Map.entry;
import static java.util.stream.Collectors.*;

public class MasterClass {

stuart-marks

--- ReadFileJavaApplicationBufferedReader0.java
+++ ReadFileJavaApplicationBufferedReader1.java
@@ -57,8 +57,8 @@
                // System.out.println(readLine);
 
                // get all the names
-               String array1[] = readLine.split("\\s*\\|\\s*");
-               String name = array1[7];
+               String array1[] = readLine.split("\\|", 9);
+               String name = array1[7].strip();

stuart-marks

--- ReadFileJavaApplicationBufferedReader1.java
+++ ReadFileJavaApplicationBufferedReader2.java
@@ -29,17 +29,12 @@
 
        // get total line count
        Instant lineCountStart = Instant.now();
-       int lines = 0;
 
        Instant namesStart = Instant.now();
        ArrayList<String> names = new ArrayList<>();

stuart-marks

--- ReadFileJavaApplicationBufferedReader2.java
+++ ReadFileJavaApplicationBufferedReader3.java
@@ -44,6 +45,7 @@
        Instant commonNameStart = Instant.now();
        ArrayList<String> firstNames = new ArrayList<>();
 
+         var namePat = Pattern.compile(", \\s*(([^ ]*), |([^ ]+))");
 
          System.out.println("Reading file using " + Caller.getName());
 

stuart-marks

--- ReadFileJavaApplicationBufferedReader3.java  2019-01-05 20:40:01.000000000 -0800
+++ ReadFileJavaApplicationBufferedReader4.java 2019-01-05 20:40:05.000000000 -0800
@@ -45,7 +45,7 @@
        Instant commonNameStart = Instant.now();
        ArrayList<String> firstNames = new ArrayList<>();
 
-         var namePat = Pattern.compile(", \\s*(([^ ]*), |([^ ]+))");
+         var namePat = Pattern.compile(", \\s*([^, ]+)");
 
          System.out.println("Reading file using " + Caller.getName());

stuart-marks

--- ReadFileJavaApplicationBufferedReader4.java  2019-01-05 20:40:05.000000000 -0800
+++ ReadFileJavaApplicationBufferedReader5.java 2019-01-05 20:40:11.000000000 -0800
@@ -46,6 +46,8 @@
        ArrayList<String> firstNames = new ArrayList<>();
 
          var namePat = Pattern.compile(", \\s*([^, ]+)");
+         char[] chars = new char[6];
+         StringBuilder sb = new StringBuilder(7);
 
          System.out.println("Reading file using " + Caller.getName());

stuart-marks

--- ReadFileJavaApplicationBufferedReader5.java  2019-01-05 20:40:11.000000000 -0800
+++ ReadFileJavaApplicationBufferedReader6.java 2019-01-05 20:40:15.000000000 -0800
@@ -115,16 +115,9 @@
                }
        }
 
-       LinkedList<Entry<String, Integer>> list = new LinkedList<>(map.entrySet());
+         Entry<String, Integer> common = Collections.max(map.entrySet(), Entry.comparingByValue());
 
-       Collections.sort(list, new Comparator<Map.Entry<String, Integer> >() {

stuart-marks

// https://twitter.com/stuartmarks/status/1304654956146745344

import java.lang.reflect.Field;

public class StillAlive {
    @SuppressWarnings("deprecation") // oh shut up
    static Boolean truе = new Boolean(true);

    static void WearMask() { }
    static void Stay6ftApart() { }