The life of TB

# Main.java import java.util.Arrays;import java.util.HashSet;import java.util.Set; public class Main { public static Set union(Set s1, Set s2) {Set result = new HashSet(s1);result.addAll(s2);return result; } public static void main(String[] args) {Set guys = new HashSet(Arrays.asList("Tom", "Dick", "Harry"));Set numbers = new HashSet(Arrays.asList("1", "2", "3"));Set mix = union(guys, numbers);S..

Java 2016. 7. 25. 20:09

# StringLengthComparator.java import java.util.Comparator; public class StringLengthComparator implements Comparator { @Override public int compare(String o1, String o2) {if (o1.length() == o2.length()) { return 0;} else { return o1.length() > o2.length() ? 1 : -1;} }} # Main.java public class Main { public static void main(String[] args) {String[] strArray = {"aaa", "bb", "c"};Arrays.sort(strAr..

Java 2016. 7. 25. 16:44

# Item.java public class Item { private String name; private int id; public Item(String name) {this.name = name; } public String getName() { return name; } public int getId() { return id; } public void setName(String name) { this.name = name; } public void setId(int id) { this.id = id; }} # ItemProcess.java public interface ItemProcess { void process(T t);} # ItemManager.java import java.util.Ar..

Java 2016. 7. 25. 15:46

# Main.java import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List; public class Main { public static void main(String[] args) { List al = new ArrayList();al.add("ab");al.add("c"); Collections.sort(al, new Comparator() { // sorted by string length @Override public int compare(String o1, String o2) {if (o1.length() == o2.length()) { return 0;} re..

Java 2016. 7. 25. 14:37

# 골격 구현 추상 클래스를 이용한 List 인터페이스 구현 메소드 package Item18; import java.util.AbstractList; import java.util.Iterator; import java.util.List; public class Main { public static void main(String[] args) { int[] i = { 1, 2, 3 }; List l = intArrayAsList(i); // 배열을 넣었지만 get 메소드를 사용할 수 있다. System.out.println(l.get(1)); System.out.println("\n"); // 배열에 이터레이터를 사용할 수 있다. Iterator itr = l.iterator(); while (itr...

Java 2016. 7. 23. 23:30

# High-level code says to low-level code: "Don't call us, we'll call you." # Frameworks are, in fact, a natural extension of THE TEMPLATE PATTERN. BTW, The template pattern does not have anything to do with generic classes or templated containers. In the template pattern, a complicated algorithm is implemented.(Usually in the form of an instantiated method of an abstract base class.) The abstrac..

Java 2016. 7. 22. 18:15

# example import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.URL; public class Main { public static void main(String[] args) throws IOException {URL url = new URL("http://www.google.com");BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));String line;while ((line = reader.readLine()) != null) { System.out.pri..

Java 2016. 7. 22. 17:53

# What is a singleton? - There are situations where exactly one object of a particula type is needed.- Where it would be bad to have any more than one object of a particular class. - Device drivers, registry setting manager, or other system - wide shared objects are the classic examples.- Singleton objects also make sense where the state of an object consumes a lot of memory, and just one versio..

Java 2016. 7. 22. 13:56