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

Groovy

Java

2011 5 28

Java
2011 05/28
Slide # 2
2011 5 28

Java
2011 05/28
Slide # 3
2011 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 # 4
2011 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 # 5
2011 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 # 6
2011 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 # 7
2011 5 28

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 # 8
2011 5 28

  map[it]++ // map 1
  }
}
}

Java
2011 05/28
Slide # 9
2011 5 28

  map[it]++ // map 1
  }
}
}

Java
2011 05/28
Slide # 10
2011 5 28

  map[it]++ // map 1
  }
}
}

Java
2011 05/28
Slide # 11
2011 5 28

  map[it]++ // map 1
  }
}
}

Java
2011 05/28
Slide # 12
2011 5 28

  map[it]++ // map 1
  }
}
}

Java
2011 05/28
Slide # 13
2011 5 28

  map[it]++ // map 1
  }
}
}

Java
2011 05/28
Slide # 14
2011 5 28

Java
2011 05/28
Slide # 15
2011 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 # 16
2011 5 28

Groovy :4

@Immutable
class Person {
String firstName, lastName
}

Java
2011 05/28
Slide # 17
2011 5 28

Groovy :4

@Immutable
class Person {
}

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 # 17
2011 5 28

Groovy :4

@Immutable
class Person {
}

x.firstName = "abc"

Java
2011 05/28
Slide # 18
2011 5 28

Groovy :4

@Immutable
class Person {
}

x.firstName = "abc"

Java
2011 05/28
Slide # 19
2011 5 28

Groovy :4

@Immutable
class Person {
}

x.firstName = "abc"

Java
2011 05/28
Slide # 20
2011 5 28

Java
2011 05/28
Slide # 21
2011 5 28

DSL
OS

PHP Haskel
C++
Python
C Ruby
Java

Java + Groovy
Java
2011 05/28
Slide # 22
2011 5 28

Groovy
Java

Java
2011 05/28
Slide # 23
2011 5 28

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

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