Let's go Developer 2011 sendai Let's go Java Developer (Programming Language Groovy Part)

Groovy Java2011 5 28

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Java 2011 05/28 Slide # 32011 5 28

$ cat input.txt That that is is that that is not is not is that it it is $ java WordCount input.txt 1: [That] 2: [not] 2: [it] 4: [that] 6: [is] Java 2011 05/28 Slide # 42011 5 28

Java WordCount:48 Set<Map.Entry<String, Integer>> entrySet = import java.util.Comparator; map.entrySet(); import java.util.HashMap; Object[] list = entrySet.toArray(); import java.util.Map; Comparator comp = new Comparator(){ import java.util.Set; public int compare(Object o1, Object o2) import java.util.List; { import java.util.Arrays; Map.Entry<String, Integer> e1 = import java.io.FileReader; (Map.Entry<String, Integer>) o1; import java.io.BufferedReader; Map.Entry<String, Integer> e2 = import java.io.FileNotFoundException; (Map.Entry<String, Integer>) o2; import java.io.IOException; return e1.getValue() - e2.getValue(); } public class WordCount { }; @SuppressWarnings(value = "unchecked") Arrays.sort(list, comp); public static void main(String[] args) { for (Object it: list) { FileReader fis = null; Map.Entry<String, Integer> entry = BufferedReader br = null; (Map.Entry<String, Integer>)it; try { System.out.println(entry.getValue() + ": HashMap<String, Integer> map = new ["+entry.getKey()+"]"); HashMap<String, Integer>(); } fis = new FileReader(args[0]); } br = new BufferedReader(fis); catch (IOException e) { String line; try {if (br != null) br.close();}catch while ((line = br.readLine()) != null) { (IOException ioe){} for (String it: line.split("s+")) { try {if (fis != null)fis.close();}catch map.put(it, (map.get(it)==null) ? 1 : (IOException ioe){} (map.get(it) + 1)); e.printStackTrace(); } } Java } } } 2011 05/28 Slide # 52011 5 28

Groovy WordCount(9 ) def map = [:].withDefault{0} new File(args[0]).eachLine { it.split(/s+/).each { map[it]++ } } map.entrySet().sort{it.value}.each { println "${it.value}: [${it.key}]" } Java 2011 05/28 Slide # 62011 5 28

Java Set<Map.Entry<String, Integer>> import java.util.Comparator; entrySet = map.entrySet(); import java.util.HashMap; Object[] list = entrySet.toArray(); import java.util.Map; Comparator comp = new Comparator(){ import java.util.Set; public int compare(Object o1, import java.util.List; Object o2) { import java.util.Arrays; Map.Entry<String, Integer> e1 import java.io.FileReader; = (Map.Entry<String, Integer>) o1; import java.io.BufferedReader; Map.Entry<String, Integer> e2 import java.io.FileNotFoundException; = (Map.Entry<String, Integer>) o2; import java.io.IOException; return e1.getValue() - e2.getValue(); public class WordCount { } @SuppressWarnings(value = "unchecked") }; public static void main(String[] args) { Arrays.sort(list, comp); FileReader fis = null; for (Object it: list) { BufferedReader br = null; Map.Entry<String, Integer> entry try { = (Map.Entry<String, Integer>)it; HashMap<String, Integer> map = new System.out.println(entry.getValue HashMap<String, Integer>(); () + ": ["+entry.getKey()+"]"); fis = new FileReader(args[0]); } br = new BufferedReader(fis); } String line; catch (IOException e) { while ((line = br.readLine()) != try {if (br != null) br.close();} null) { catch(IOException ioe){} for (String it: line.split("s try {if (fis != null)fis.close();} +")) { catch(IOException ioe){} map.put(it, (map.get(it) e.printStackTrace(); ==null) ? 1 : (map.get(it) + 1)); } } } Java } } 2011 05/28 Slide # 72011 5 28

Groovy WordCount(9 ) def map = [:].withDefault{0} // value 0 map new File(args[0]).eachLine { // it.split(/s+/).each { // /s+/ map[it]++ // map 1 } } map.entrySet().sort{it.value}.each {// map entrySet value println "${it.value}: [${it.key}]"// key,value } Java 2011 05/28 Slide # 82011 5 28

Java 2011 05/28 Slide # 152011 5 28

public final class Person { if (obj == null) private final String firstName; return false; private final String lastName; if (getClass() != obj.getClass()) return false; public Person(String firstName, String lastName) { Person other = (Person) obj; this.firstName = firstName; if (firstName == null) { this.lastName = lastName; if (other.firstName != null) } return false; } else if (!firstName.equals(other.firstName)) public String getFirstName() { return false; return firstName; if (lastName == null) { } if (other.lastName != null) return false; public String getLastName() { } else if (!lastName.equals(other.lastName)) return lastName; return false; } return true; } @Override public int hashCode() { @Override final int prime = 31; public String toString() { int result = 1; return "Person(firstName:" + firstName result = prime * result + ((firstName == null) + ", lastName:" + lastName + ")"; ? 0 : firstName.hashCode()); } result = prime * result + ((lastName == null) ? 0 : lastName.hashCode()); } return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; Java 2011 05/28 Slide # 162011 5 28

Groovy :4 @Immutable class Person { String firstName, lastName } Java 2011 05/28 Slide # 172011 5 28

Groovy :4 @Immutable class Person { String firstName, lastName } x = new Person("Junji","Uehara") assert x.lastName == "Uehara" x.firstName = "abc" //==> groovy.lang.ReadOnlyPropertyException: Cannot set readonly property: firstName Java for class: Person 2011 05/28 Slide # 172011 5 28

Groovy :4 @Immutable class Person { String firstName, lastName } x = new Person("Junji","Uehara") assert x.lastName == "Uehara" x.firstName = "abc" Java 2011 05/28 Slide # 182011 5 28

Java 2011 05/28 Slide # 212011 5 28

DSL OS PHP Haskel C++ Python C Ruby Java Java + Groovy Java 2011 05/28 Slide # 222011 5 28

Groovy Java Java 2011 05/28 Slide # 232011 5 28

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Let's go Developer 2011 sendai Let's go Java Developer (Programming Language Groovy Part)

by Junji Uehara

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