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Countries.java
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145 lines (123 loc) · 3.65 KB
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package btp.oneP;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
public class Countries {
public static void main(String[] args) {
System.out.println(capitals(10));
System.out.println(names(10));
System.out.println(new HashMap<String,String>(capitals(3)));
System.out.println(new LinkedHashMap<String,String>(capitals(3)));
System.out.println(new TreeMap<String,String>(capitals(3)));
System.out.println(new Hashtable<String,String>(capitals(3)));
System.out.println(new HashSet<String>(names(6)));
System.out.println(new LinkedHashSet<String>(names(6)));
System.out.println(new TreeSet<String>(names(6)));
System.out.println(new ArrayList<String>(names(6)));
System.out.println(new LinkedList<String>(names(6)));
System.out.println(capitals().get("ALGERIA"));
}
public static final String[][] DATA = {
{"ALGERIA","Algiers"},{"CHINA","Beijing"},
{"Japan","Tokoy"},{"America","Washington"}
};
private static class FlyweightMap extends AbstractMap<String,String>{
private static class Entry implements Map.Entry<String, String>{
int index;
Entry(int index){
this.index = index;
}
public boolean equals(Object o){
return DATA[index][0].equals(o);
}
@Override
public String getKey() {
// TODO Auto-generated method stub
return DATA[index][0];
}
@Override
public String getValue() {
return DATA[index][1];
}
@Override
public String setValue(String value) {
// TODO Auto-generated method stub
return null;
}
public int hashCode(){
return DATA[index][0].hashCode();
}
}
static class EntrySet extends AbstractSet<Map.Entry<String, String>>{
private int size;
EntrySet(int size){
if(size < 0){
this.size = 0;
}else if(size > DATA.length){
this.size = DATA.length;
}else{
this.size = size;
}
}
public int size(){
return size;
}
@Override
public Iterator<java.util.Map.Entry<String, String>> iterator() {
// TODO Auto-generated method stub
return new Iter();
}
private class Iter implements Iterator<Map.Entry<String, String>>{
private Entry entry = new Entry(-1);
@Override
public boolean hasNext() {
// TODO Auto-generated method stub
return entry.index < size - 1;
}
@Override
public java.util.Map.Entry<String, String> next() {
entry.index++;
return entry;
}
}
}
private static Set<Map.Entry<String, String>> entries = new EntrySet(DATA.length);
@Override
public Set<java.util.Map.Entry<String, String>> entrySet() {
return entries;
}
}
static Map<String,String> select(final int size){
return new FlyweightMap(){
public Set<Map.Entry<String, String>> entrySet(){
return new EntrySet(size);
}
};
}
static Map<String,String> map = new FlyweightMap();
public static Map<String,String> capitals(){
return map;
}
public static Map<String,String> capitals(int size){
return select(size);
}
static List<String> names = new ArrayList<String>(map.keySet());
public static List<String> names(){
return names;
}
public static List<String> names(int size){
return new ArrayList<String>(select(size).keySet());
}
}