Hashtable key value pair add put get pair Java Android example
How add pair of strings to Hashtable, how get pair key value from Hashtable, how split string, basic Java Android example.
MainClass.java
MainClass.java
import java.util.Enumeration;
import java.util.Hashtable;
public class MainClass {
public static void main(String[] arg) {
// english;germany dictionary
String[] arrayOfString = { "one;eine", "two;zwei", "three;drei" };
Hashtable<String, String> hashTable = new Hashtable<String, String>();
for(String s: arrayOfString){
String[] array = s.split(";");
String sKey ="", sValue="";
if(array.length > 1){
sKey = array[0]; sValue = array[1];
hashTable.put(sKey, sValue);
}
}
Enumeration<String> enumer = hashTable.keys();
while (enumer.hasMoreElements()) {
String keyFromTable = (String) enumer.nextElement();
// get Returns the value to which the specified key is mapped,
// or null if this map contains no mapping for the key
System.out.println(keyFromTable + " = " + hashTable.get(keyFromTable));
}
}
}
/*
two = zwei
one = eine
three = drei
*/
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Map TreeMap sorted by value Java Android example.
MainClass.java
MainClass.java
import java.util.Comparator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
public class MainClass {
public static void main(String[] arg) {
// english;germany dictionary
String[] arrayOfString = { "one;eine", "two;zwei", "three;drei",
"four;vier" };
Map<String, String> map = new TreeMap<String, String>();
for (String s : arrayOfString) {
String[] array = s.split(";");
String sKey = "", sValue = "";
if (array.length > 1) {
sKey = array[0];
sValue = array[1];
map.put(sKey, sValue);
}
}
for (Entry<String, String> entry: mapSortedByValues(map)) {
System.out.println(entry.getKey() + " = " + entry.getValue());
}
}
static <K, V extends Comparable<? super V>> SortedSet<Map.Entry<K, V>> mapSortedByValues(
Map<K, V> map) {
SortedSet<Map.Entry<K, V>> sortedSetOfEntries = new TreeSet<Map.Entry<K, V>>(
new Comparator<Map.Entry<K, V>>() {
@Override
public int compare(Map.Entry<K, V> entry_1, Map.Entry<K, V> entry_2) {
int res = entry_1.getValue().compareTo(entry_2.getValue());
return res != 0 ? res : 1;
// return entry_1.getValue().compareTo(entry_2.getValue());
}
});
sortedSetOfEntries.addAll(map.entrySet());
return sortedSetOfEntries;
}
}
/*
three = drei
one = eine
four = vier
two = zwei
*/
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
// CONSTRUCTOR
public SampleView(Context context) {
super(context);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
canvas.drawColor(Color.GREEN);
Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ALPHA_8);
paint.setColor(Color.BLUE);
Canvas c = new Canvas(b);
c.drawRect(0, 0, 200, 200, paint);
canvas.drawBitmap(b, 10,10, paint);
}
}
}
![android/monochromatic-bitmap.png android/monochromatic-bitmap.png](https://www.okhelp.cz/images/android/monochromatic-bitmap.png)
List LinkedList Collections add sort find search Item, get searched item to string in Java example.
MainClass.java
MainClass.java
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = {"nothing", "Hello", "people"
, "bye-bye", "hello", "world!", "End" };
List<String> arrayList = new LinkedList<String>();
for(String s: arrayOfString)
arrayList.add(s);
Collections.sort(arrayList);
// foreach
for (String str: arrayList)
System.out.println(str);
Object objMin = Collections.min(arrayList);
System.out.println("Min is: " + objMin);
Object objMax = Collections.max(arrayList);
System.out.println("Max is: " + objMax);
int index = Collections.binarySearch(arrayList, "people");
System.out.println("Index of people is: " + index);
// print word on index 5
System.out.println("Index 5 is: " + arrayList.get(5));
String sItem = arrayList.get(5); // get item from index 5 to string
}
}
/*
End
Hello
bye-bye
hello
nothing
people
world!
Min is: End
Max is: world!
Index of people is: 5
Index 5 is: people
*/
Set, get string , array of array of strings, Java example code
public final static String[][]_arArOfString_1 = {
new String[] {"bla","bla","hello world!"},
new String[] {},
new String[] {},
new String[] {},
new String[] {},
new String[] {}
};
String sOut = _arArOfString_1[0][2]; // hello world!
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Editace: 2013-12-09 10:56:37
Počet článků v kategorii: 396
Url:hashtable-key-value-pair-add-put-get-pair-java-android-example